期刊文献+
任意字段
题名或关键词
题名
关键词
摘要
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到605篇文章
< 1 2 … 31 >
每页显示 20 50 100
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
显示方式：
Mapping crustal S-wave velocity structure with SV-component receiver function method 认领 引用 被引量：1
1
作者 邹最红 陈晓非 《Acta Seismologica Sinica(English Edition)》 2003年第1期16-25,共10页
In this article, we analyze the characters of SV-component receiver function of teleseismic body waves and its advantages in mapping the S-wave velocity structure of crust in detail. Similar to radial receiver functio... In this article, we analyze the characters of SV-component receiver function of teleseismic body waves and its advantages in mapping the S-wave velocity structure of crust in detail. Similar to radial receiver function, SV-component receiver function can be obtained by directly deconvolving the P-component from the SV-component of teleseismic recordings. Our analyses indicate that the change of amplitude of SV-component receiver function against the change of epicentral distance is less than that of radial receiver function. Moreover, the waveform of SV-component receiver function is simpler than the radial receiver function and gives prominence to the PS converted phases that are the most sensitive to the shear wave velocity structure in the inversion. The synthetic tests show that the convergence of SV-component receiver function inversion is faster than that of the radial receiver function inversion. As an example, we investigate the S-wave velocity structure beneath HIA sta-tion by using the SV-component receiver function inversion method. 展开更多
关键词 receiver function SV-component receiver function S-wave velocity structure inversion
暂未订购 下载PDF
The fast quality control strategy for P-wave receiver functions based on AlexNet and wiggle plot 认领 引用
2
作者 Jiajun Chen Chuntao Liang Rui Xu 《Earthquake Science》 CAS CSCD 2026年第2期140-155,共16页
This paper proposes a fast quality control strategy for P-wave receiver functions based on AlexNet and wiggle plots.Receiver functions are essential tools in seismology,particularly for analyzing seismic wave propagat... This paper proposes a fast quality control strategy for P-wave receiver functions based on AlexNet and wiggle plots.Receiver functions are essential tools in seismology,particularly for analyzing seismic wave propagation and subsurface structures,such as the crust and upper mantle.However,the quality control of receiver functions is often a tedious,time-consuming process.In this study,we transform the time series classification problem of receiver function quality control problem into an image classification task by plotting receiver functions as wiggle diagrams and using the deep learning model AlexNet for binary classification to distinguish between“good”and“bad”receiver functions.The model achieved an accuracy of 92.55%on the testing set and demonstrated strong generalization performance with an accuracy of 89.23%on receiver functions of another seismic network(Sichuan Provincial Permanent Seismic Network).While maintaining strong performance,the model is capable of processing approximately 32 receiver function wiggle plots per second on an NVIDIA GeForce RTX 4050.The results show that the proposed feature mapping strategy significantly improves the efficiency and accuracy of receiver function quality control,making it a valuable tool for practical applications.Future work will focus on expanding the dataset and optimizing model performance for broader seismic data applications. 展开更多
关键词 receiver function automated quality control deep learning AlexNet wiggle plot
暂未订购 下载PDF
Inversion of the Deep Structure of the Northern Margin of the Ordos Block Using Teleseismic Receiver Functions and Gravity Data 认领 引用
3
作者 Cui Feng-Zhi Zhang Fan +4 位作者 Li Juan Pei Dong-Yang Bai Yi-Hang Wang Lei Wang Hui 《Applied Geophysics》 SCIE CSCD 2025年第4期1425-1443,1501,1502,共19页
The Ordos Block is a critical component of the North China Craton(NCC),which is located at the northeastern edge of the Tibetan Plateau.Over the years,it has undergone complex tectonic evolution due to the influence o... The Ordos Block is a critical component of the North China Craton(NCC),which is located at the northeastern edge of the Tibetan Plateau.Over the years,it has undergone complex tectonic evolution due to the influence of multiple factors,such as the India–Eurasia plate collision,the subduction of the Pacific Plate,and the southward movement of the Siberian Plate.To investigate the crustal structure and dynamic evolution of the northern margin of the Ordos Block,this study employs joint inversion of receiver functions and gravity data and then integrates results from geology,geophysics,and geodesy.The overall results indicate that the crustal thickness shows a thickening trend from south to north.The generally high Poisson’s ratio suggests that the crust is rich in silica or subjected to high crustal stress.Furthermore,the common conversion point(CCP)stacking results identify distinct layering in the subsurface structure of the northern margin,including the Conrad discontinuity and low-velocity zones,thus reflecting its complex deep structure.Driven by the eastward growth of the Tibetan Plateau and the northwestward subduction of the Pacific Plate,the block rotates counterclockwise,playing a significant role in the formation of surrounding rift basins.The abovementioned findings emphasize the influence of surrounding tectonic activities on the crustal structure and dynamics of the northern margin of the Ordos Block,thus highlighting the potential for strong earthquakes in the region. 展开更多
关键词 Ordos Block North China Craton Receiver Function Gravity Data Poisson’s Ratio
暂未订购 下载PDF
High-quality control of receiver functions using a capsule neural network 认领 引用 被引量：2
4
作者 Mona H.Hegazi Ahmad M.Faried Omar M.Saad 《Earthquake Science》 CAS CSCD 2025年第2期93-109,共17页
The Red Sea-Gulf of Suez-Cairo-Alexandria Clysmic-Trend in northern Egypt is the main earthquake zone in the country,with a moderate-to-high seismic hazard and a history of significant earthquakes caused by rifting an... The Red Sea-Gulf of Suez-Cairo-Alexandria Clysmic-Trend in northern Egypt is the main earthquake zone in the country,with a moderate-to-high seismic hazard and a history of significant earthquakes caused by rifting and active faulting.To improve our understanding of the tectonic and seismic processes in this area,more comprehensive imaging of the crustal structure is required.This can be achieved by increasing the number of receiver functions(RFs)recorded by the seismic stations in northern Egypt and the southeastern Mediterranean.Data handling and processing should also be automated to increase process efficiency.In this study,we developed a capsule neural network for automated selection of RFs.The model was trained on a dataset containing RFs(both selected and unselected)from five broadband stations in northern Egypt.Stations SLM,SIWA,KOT,NBNS,and NKL are located in the unstable shelf region of Egypt,where limited knowledge of the deep crustal structure is available.The proposed capsule neural network achieved an average precision of 80%on the test set.The automated selection of RFs using a capsule neural network has the potential to significantly improve the efficiency and accuracy of RF analysis,as demonstrated by the stacking test.This could lead to a better understanding of crustal structure and tectonic processes in northern Egypt and the southeastern Mediterranean. 展开更多
关键词 crustal structure receiver functions deep learning northern Egypt
暂未订购 下载PDF
Crustal structure of the central Cathaysia block in South China derived from receiver functions 认领 引用 被引量：1
5
作者 Ao Li Zhengyuan Jia +2 位作者 Guoming Jiang Guibin Zhang Dapeng Zhao 《Earthquake Science》 CAS CSCD 2025年第6期545-563,共19页
The Cathaysia block in Southeast China has undergone complex compression,collision and tectonic evolution processes,which have led to the formation of rich granites and polymetallic ores.However,its history of crustal... The Cathaysia block in Southeast China has undergone complex compression,collision and tectonic evolution processes,which have led to the formation of rich granites and polymetallic ores.However,its history of crustal evolution and metallogenic mechanisms remain unclear.To explore the deep geodynamic processes in the central Cathaysia block,we deployed a dense broadband seismic array with a station interval of~5 km from July 2017 to August 2020.This seismic array,composed of 80 portable stations,traverses the Nanling and Wuyi metallogenic belts and crosses four deep faults.We employ the teleseismic receiver-function method to estimate the crustal thickness and vP/vS ratio beneath the seismic array.Our results reveal a distinct negative correlation between the crustal thickness and the vP/vS ratio within the crust,which might be closely associated with crustal deformation.The average crustal thickness is~30 km,indicating that the crust was thinned under an extensional environment.However,the crust beneath the Wuyi belt is slightly thicker and has a lower vP/vS ratio than its adjacent areas,which may reflect thickening of the upper crust due to its ductility and lithospheric delamination. 展开更多
关键词 receiver functions crustal thickness vP/vS ratio metallogenic mechanism Cathaysia block
暂未订购 下载PDF
Investigation of Near-Surface S-Wave Velocity Structure beneath the Epicenter and adjacent Area of the Jishishan Earthquake by using the Receiver Function 认领 引用
6
作者 Fan-chang Meng Ruo-ge Xu +2 位作者 Hui Sun Bo Li Yun Long 《Applied Geophysics》 SCIE CSCD 2025年第3期647-659,893,共13页
Based on the observational data from 60 short-period stations deployed in the Jishishan M6.2 earthquake epicenter and adjacent regions(Gansu Province,2023),this study inverted the near-surface S-wave velocity structur... Based on the observational data from 60 short-period stations deployed in the Jishishan M6.2 earthquake epicenter and adjacent regions(Gansu Province,2023),this study inverted the near-surface S-wave velocity structure through teleseismic receiver function analysis by using the amplitude of direct P-wave.The results reveal that the epicentral area(Liugou Township and surroundings)exhibits markedly low S-wave velocities of 400-600 m/s,with a mean value of(500±50)m/s.In contrast,intermountain basins-Guanting Basin and Dahejia Basin-demonstrate significantly elevated velocities,exceeding the epicentral zone by 100-300 m/s,with values concentrated at 600-900 m/s.Notably,localized areas such as Jintian Village and Caotan Village maintain stable S-wave velocities of(700±30)m/s.The western margin tectonic belt of Jishishan displays distinctive velocity differentiation:A pronounced velocity gradient zone along the 35.8°N latitude boundary separates northern areas(750 m/s).These findings demonstrate significant spatial heterogeneity in shallow S-wave velocity structures,primarily controlled by three factors:(1)topographic-geomorphic units,(2)stratigraphic lithological contrasts,and(3)anthropogenic modifications.The persistent low-velocity anomalies(<600 m/s)in the epicentral zone and northern Yellow River T2 terrace likely correlate with Quaternary unconsolidated sediments,enhanced groundwater circulation,and bedrock weathering.These results provide critical geophysical constraints for understanding both the seismogenic environment of the Jishishan earthquake and its damage distribution patterns.Furthermore,they establish a foundational framework for regional seismic intensity evaluation,site amplification analysis,and secondary hazard risk assessment. 展开更多
关键词 Jishishan Earthquake Dense Seismic Array Receiver Function S-Wave Velocity Structure
暂未订购 下载PDF
Crust and upper mantle structures beneath Northeast China from receiver function studies 认领 引用 被引量：11
7
作者 Zhen Guo Yuliang Cao +5 位作者 Xianguang Wang Y.John Chen Jieyuan Ning Weiguang He Youcai Tang Yongge Feng 《Earthquake Science》 2014年第3期265-275,共11页
P-wave and S-wave receiver function analyses have been performed along a profile consisted of 27 broadband seismic stations to image the crustal and upper mantle discontinuities across Northeast China. The results sho... P-wave and S-wave receiver function analyses have been performed along a profile consisted of 27 broadband seismic stations to image the crustal and upper mantle discontinuities across Northeast China. The results show that the average Moho depth varies from about 37 km beneath the Daxing＇anling orogenic belt in the west to about 33 km beneath the Songliao Basin, and to about 35 km beneath the Changbai mountain region in the east. Our results reveal that the Moho is generally flat beneath the Daxing＇anling region and a remarkable Moho offset （about 4 km） exists beneath the basin-mountain boundary, the Daxing＇anling-Taihang Gravity Line. Beneath the Tanlu faults zone, which seperates the Songliao Basin and Changbai region, the Moho is uplift and the crustal thick- ness changes rapidly. We interpret this feature as that the Tanlu faults might deeply penetrate into the upper mantle, and facilitate the mantle upwelling along the faults during the Cenozoic era. The average depth of the lithosphereasthenosphere boundary （LAB） is - 80 km along the profile which is thinner than an average thickness of a continental lithosphere. The LAB shows an arc-like shape in the basin, with the shallowest part approximately beneath the center of the basin. The uplift LAB beneath the basin might be related to the extensive lithospheric stretching in the Mesozoic. In the mantle transition zone, a structurally complicated 660 km discontinuity with a maximum 35 km depression beneath the Changbai region is observed. The 35 km depression is roughly coincident with the location of the stagnant western pacific slab on top of the 660 km discontinuity revealed by the recent P wave tomography. 展开更多
关键词 Northeast China NCC - Receiver function Migration - CCP - Moho - LAB Mantle transition zone
暂未订购 下载PDF
A radiomics approach for predicting gait freezing in Parkinson's disease based on resting-state functional magnetic resonance imaging indices:A cross-sectional study 认领 引用 被引量：3
8
作者 Miaoran Guo Hu Liu +6 位作者 Long Gao Hongmei Yu Yan Ren Yingmei Li Huaguang Yang Chenghao Cao Guoguang Fan 《Neural Regeneration Research》 SCIE CAS CSCD 2026年第4期1621-1627,共7页
Freezing of gait is a significant and debilitating motor symptom often observed in individuals with Parkinson's disease.Resting-state functional magnetic resonance imaging,along with its multi-level feature indice... Freezing of gait is a significant and debilitating motor symptom often observed in individuals with Parkinson's disease.Resting-state functional magnetic resonance imaging,along with its multi-level feature indices,has provided a fresh perspective and valuable insight into the study of freezing of gait in Parkinson's disease.It has been revealed that Parkinson's disease is accompanied by widespread irregularities in inherent brain network activity.However,the effective integration of the multi-level indices of resting-state functional magnetic resonance imaging into clinical settings for the diagnosis of freezing of gait in Parkinson's disease remains a challenge.Although previous studies have demonstrated that radiomics can extract optimal features as biomarkers to identify or predict diseases,a knowledge gap still exists in the field of freezing of gait in Parkinson's disease.This cross-sectional study aimed to evaluate the ability of radiomics features based on multi-level indices of resting-state functional magnetic resonance imaging,along with clinical features,to distinguish between Parkinson's disease patients with and without freezing of gait.We recruited 28 patients with Parkinson's disease who had freezing of gait(15 men and 13 women,average age 63 years)and 30 patients with Parkinson's disease who had no freezing of gait(16 men and 14 women,average age 64 years).Magnetic resonance imaging scans were obtained using a 3.0T scanner to extract the mean amplitude of low-frequency fluctuations,mean regional homogeneity,and degree centrality.Neurological and clinical characteristics were also evaluated.We used the least absolute shrinkage and selection operator algorithm to extract features and established feedforward neural network models based solely on resting-state functional magnetic resonance imaging indicators.We then performed predictive analysis of three distinct groups based on resting-state functional magnetic resonance imaging indicators indicators combined with clinical features.Subsequently,we conducted 100 additional five-fold cross-validations to determine the most effective model for each classification task and evaluated the performance of the model using the area under the receiver operating characteristic curve.The results showed that when differentiating patients with Parkinson's disease who had freezing of gait from those who did not have freezing of gait,or from healthy controls,the models using only the mean regional homogeneity values achieved the highest area under the receiver operating characteristic curve values of 0.750(with an accuracy of 70.9%)and 0.759(with an accuracy of 65.3%),respectively.When classifying patients with Parkinson's disease who had freezing of gait from those who had no freezing of gait,the model using the mean amplitude of low-frequency fluctuation values combined with two clinical features achieved the highest area under the receiver operating characteristic curve of 0.847(with an accuracy of 74.3%).The most significant features for patients with Parkinson's disease who had freezing of gait were amplitude of low-frequency fluctuation alterations in the left parahippocampal gyrus and two clinical characteristics:Montreal Cognitive Assessment and Hamilton Depression Scale scores.Our findings suggest that radiomics features derived from resting-state functional magnetic resonance imaging indices and clinical information can serve as valuable indices for the identification of freezing of gait in Parkinson's disease. 展开更多
关键词 amplitude of low-frequency fluctuation degree centrality feedforward neural network freezing of gait machine learning parahippocampal gyrus Parkinson's disease receiver operating characteristic regional homogeneity resting-state functional magnetic resonance imaging
暂未订购 下载PDF
S-wave velocity structure beneath Changbaishan volcano inferred from receiver function 认领 引用 被引量：7
9
作者 Jianping Wu Yuehong Ming +1 位作者 Lihua Fang Weilai Wang 《Earthquake Science》 2009年第4期409-416,共8页
The S wave velocity structure in Changbaishan volcanic region was obtained from teleseismic receiver function modeling.The results show that there exist distinct low velocity layers in crust in volcano area.Beneath WQ... The S wave velocity structure in Changbaishan volcanic region was obtained from teleseismic receiver function modeling.The results show that there exist distinct low velocity layers in crust in volcano area.Beneath WQD station near to the Tianchi caldera the low velocity layer at 8 km depth is 20 km thick with the lowest S-wave velocity about 2.2 km/s At EDO station located 50 km north of Tianchi caldera,no obvious crustal low velocity layer is detected.In the volcanic region,the thickness of crustal low velocity layer is greater and the lowest velocity is more obvious with the distance shorter to the caldera.It indicates the existence of the high temperature material or magma reservoir in crust near the Tianchi caldera.The receiver functions and inversion result from different back azimuths at CBS permanent seismic station show that the thickness of near surface low velocity layer and Moho depth change with directions.The near surface low velocity layer is obviously thicker in south direction.The Moho depth shows slight uplifting in the direction of the caldera located.We con-sider that the special near surface velocity structure is the main cause of relatively lower prominent frequency of volcanic earthquake waveforms recorded by CBS station.The slight uplifting of Moho beneath Tianchi caldera indicates there is a material exchanging channel between upper mantle and magma reservoir in crust. 展开更多
关键词 Changbaishan volcano seismic velocity structure receiver function
暂未订购 下载PDF
Crustal structure in the Binchuan basin of Yunnan constrained from receiver functions on a 2-D seismic dense array 认领 引用 被引量：8
10
作者 Xiaohuan Jiang Hongfeng Yang +1 位作者 Wei Yang Weitao Wang 《Earthquake Science》 2020年第5期264-272,共9页
The Binchuan region is located in a seismically active area in northwestern Yunnan,China.The detailed crustal structure is important to understand the tectonic evolution and to assess the seismic hazard in the study a... The Binchuan region is located in a seismically active area in northwestern Yunnan,China.The detailed crustal structure is important to understand the tectonic evolution and to assess the seismic hazard in the study area.With a 2-D dense array deployed in this region,we use teleseismic receiver function traditional imaging methods,including the H-κand common-conversion-point stacking methods,to derive high-resolution crustal thickness and vP/vS ratio maps.Our results indicate that the crustal thickness increases from~40 km to~46 km in the south-north direction,and the average crustal thickness beneath the Binchuan basin is~42 km.Our results agree with previous results but have higher resolution due to dense interstation spacing. 展开更多
关键词 Binchuan region crustal thickness receiver function H-κstacking common-conversion-point stacking
暂未订购 下载PDF
Crustal Structure of Yunnan Province of China from Teleseismic Receiver Functions:Implications for Regional Crust Evolution 认领 引用 被引量：3
11
作者 Fang Wang Shuangxi Zhang Mengkui Li 《Journal of Earth Science》 SCIE CAS CSCD 2018年第6期1419-1430,共12页
Yunnan Province is located on the southeastern margin of Tibet and represents an important marker in understanding the tectonic evolution of Tibetan Plateau. In this study, we calculated teleseismic P-wave receiver fu... Yunnan Province is located on the southeastern margin of Tibet and represents an important marker in understanding the tectonic evolution of Tibetan Plateau. In this study, we calculated teleseismic P-wave receiver functions at 49 permanent broadband seismic stations in Yunnan Province and estimated crustal thickness and the bulk crust ratios of P-wave to S-wave velocities using the H-κ method together with more detailed crustal structural profiles from the common conversion point stacking method. There is a significant transition of Moho interface and lower crustal composition along latitude 26°N in northwestern Yunnan. Decrease of crustal thickness with a concomitant increase of Poisson’s ratio occurs at station CUX. An interesting phenomenon is that a step-like Moho fashion is observed at several stations, which might correspond to local thermal activities, such as partial melt/lower crust delamination. Our results show changes in crustal properties appear to be associated with varieties in upper mantle structure and compositions. We propose the controlling factor of the dynamic processes below 26°N is the result of eastern forward subduction of the Indian Plate; the northern part is controlled by the redirected material flow from the SE Tibet. 展开更多
关键词 crustal structure receiver function Poisson’s ratio tectonic evolution
暂未订购 下载PDF
Receiver function study of the crustal structure of Northeast China:Seismic evidence for a mantle upwelling beneath the eastern flank of the Songliao Basin and the Changbaishan region 认领 引用 被引量：13
12
作者 Huafeng Liu Fenglin Niu 《Earthquake Science》 CSCD 2011年第1期27-33,共7页
Northeast China is a unique place to study intra-plate volcanism.We analyzed P-wave receiver function data recorded by 111 permanent broadband seismic stations in Northeast China.The results show that the crustal thic... Northeast China is a unique place to study intra-plate volcanism.We analyzed P-wave receiver function data recorded by 111 permanent broadband seismic stations in Northeast China.The results show that the crustal thickness varies from 27.9 km beneath the eastern flank of the Songliao Basin to 40.7 km beneath the Great Xing'an Range region.The large depth variations of the Moho can be largely but not completely explained by surface topography.The residual Moho depth calculated based on the Airy's isostasy model indicates that the Moho is dynamically uplifted by〈3 km beneath the eastern flank of the Songliao Basin and the Changbaishan region.We suggest that a mantle upwelling,which has been proposed by several recent seismic studies,might have caused the uplift. 展开更多
关键词 receiver function Moho Northeast China mantle upwelling
暂未订购 下载PDF
Constraining the crustal structure under the central and western Tian Shan based on teleseismic receiver functions and gravity anomalies 认领 引用 被引量：7
13
作者 Yonghua Li Hanhan Tang Lei Shi 《Earthquake Science》 2023年第1期1-14,共14页
The Tian Shan is a vast range that spans several countries in Asia.Understanding its evolutionary history may provide valuable insights into intracontinental orogenic dynamics.In this study,we explored the crustal cha... The Tian Shan is a vast range that spans several countries in Asia.Understanding its evolutionary history may provide valuable insights into intracontinental orogenic dynamics.In this study,we explored the crustal characteristics of the Tian Shan and their relationships to the tectonic evolution of the region.A new H-stacking method that combines the P receiver function and gravity anomalies was used to estimate the thickness and ratio of P-to S-wave velocities(Vp/Vs)for 91 broadband seismic stations in the central and western Tian Shan.Our results revealed significant lateral variations in crustal thickness and Vp/Vs.A—45-km-thick crust and an intermediate-high Vp/Vs(-1.74-1.84)were found in the Kazakh Shield and Tarim Basin,which we interpreted to indicate a mafic crystalline basement and lower crust.The central Tian Shan varied greatly in crustal thickness(40-64 km)and Vp/Vs ratio(1.65-2.00).which may be due to crustal shortening,mafic underplating,and crustal melting.In contrast,we observed a relatively thin crust(42-50 km)with an intermediate Vp/Vs ratio(-1.78)in the western Tian Shan.The differences in the crustal structures between the western and central Tian Shan imply that the Talas-Fergana Fault may be trans-lithospheric. 展开更多
关键词 Tian Shan crustal thickness crustal composition receiver function gravity anomaly
暂未订购 下载PDF
Receiver function estimated by maximum entropy deconvolution 认领 引用 被引量：6
14
作者 吴庆举 田小波 +2 位作者 张乃铃 李卫平 曾融生 《Acta Seismologica Sinica(English Edition)》 2003年第4期404-412,共9页
Maximum entropy deconvolution is presented to estimate receiver function, with the maximum entropy as the rule to determine auto-correlation and cross-correlation functions. The Toeplitz equation and Levinson algorith... Maximum entropy deconvolution is presented to estimate receiver function, with the maximum entropy as the rule to determine auto-correlation and cross-correlation functions. The Toeplitz equation and Levinson algorithm are used to calculate the iterative formula of error-predicting filter, and receiver function is then estimated. During extrapolation, reflective coefficient is always less than 1, which keeps maximum entropy deconvolution stable. The maximum entropy of the data outside window increases the resolution of receiver function. Both synthetic and real seismograms show that maximum entropy deconvolution is an effective method to measure receiver function in time-domain. 展开更多
关键词 receiver function maximum entropy Toeplitz equation Levinson iterative algorithm
暂未订购 下载PDF
Imaging the mantle transition zone beneath eastern and central China with CEArray receiver functions 认领 引用 被引量：10
15
作者 Xinling Wang Fenglin Niu 《Earthquake Science》 CSCD 2011年第1期65-75,共11页
We analyzed a total of 37427 receiver-function data recorded by national and regional broadband seismic networks of the China Earthquake Administration to study the mantle transition zone beneath eastern and central C... We analyzed a total of 37427 receiver-function data recorded by national and regional broadband seismic networks of the China Earthquake Administration to study the mantle transition zone beneath eastern and central China.Significant topography on both the 410-km and 660-km discontinuities was clearly imaged in the 3D volume of CCP(common-conversion-point)stacked images that cover an area of 102.5°F-122.5°E and 22.0°N-42.0°N.3D crustal and mantle velocity models were used in computing the Ps time moveouts to better image the absolute depths of the two discontinuities.We found that the 660-km discontinuity is depressed up to 25 km along the east coast of China,indicating the presence of the subducted Pacific slab in the region.More interestingly,a double 660-km was observed beneath the Huanghai Sea,which was not seen from the 410-km discontinuity.We found a strong and localized anomaly beneath the Quaternary Datong volcano located at the northeastern edge of the Ordos Plateau in North China.The 410-km is depressed by as much as 15 km beneath the volcano.If the amount of the depression is caused by unmodeled low velocity anomaly in the upper mantle,it requires either a strong(4%-8%)localized low velocity anomaly near the lithosphere-asthenosphere boundary or-1.5%low velocity column across the entire upper mantle above the 410-km.The latter could suggest a deep origin of the Datong volcano,although it was usually attributed to edge-driven convection by most of the literatures. 展开更多
关键词 mantle discontinuities phase transition receiver function eastern and centeral China
暂未订购 下载PDF
Velocity and density contrasts across the Moho interface of Guangdong province in south China constrained by receiver functions 认领 引用 被引量：3
16
作者 Yin-Ping Qian Xu-Zhang Shen +2 位作者 Xin Zhang Wen-Jun Zheng Yue-Jun Wang 《Earthquake Science》 2020年第3期141-152,共12页
The P receiver function includes P-to-SV converted phases and multiple reverberations of the discontinuities in the crust and mantle.The time of these phases is related to the crustal thickness and vp/vs ratio,and the... The P receiver function includes P-to-SV converted phases and multiple reverberations of the discontinuities in the crust and mantle.The time of these phases is related to the crustal thickness and vp/vs ratio,and the amplitude of these phases is mainly controlled by the velocity and density contrast of interfaces.By using H-κstacking method,this work estimated the crustal thickness and vP/vS ratio beneath the stations in the Guangdong province of South China.The velocity and density contrast(δβ-δρ)scanning stacking algorithm of the receiver function is applied to constrain the velocity and density contrast of the Moho in Guangdong province.This work analyzed the results of the crustal thickness,vp/vS ratio,and the velocity and density contrasts of Moho.The results indicate that the velocity contrast is higher beneath Yangjiang area in western Guangdong province and Nanao area in eastern Guangdong,which has a strong correlation with the distribution of geothermal springs in local areas and the characteristics of high heat flow.The velocity contrast of Moho has also a good correlation with the vP/vS ratio and the crustal thickness,which indicates that there is a strong material composition contrasts of the Moho in the study area.Velocity and density contrasts of Moho in some local area(such as western Guangdong)are somewhat consistent with the seismic activities. 展开更多
关键词 Moho discontinuity velocity contrast density con—trast receiver function Guangdong province
暂未订购 下载PDF
A new approach for inversion of receiver function for crustal structure in the depth domain 认领 引用 被引量：3
17
作者 TianYu Zheng YuMei He Yue Zhu 《Earth and Planetary Physics》 EI CAS CSCD 2022年第1期83-95,共13页
A method for reconstructing crustal velocity structure using the optimization of stacking receiver function amplitude in the depth domain,named common conversion amplitude(CCA)inversion,is presented.The conversion amp... A method for reconstructing crustal velocity structure using the optimization of stacking receiver function amplitude in the depth domain,named common conversion amplitude(CCA)inversion,is presented.The conversion amplitude in the depth domain,which represents the impedance change in the medium,is obtained by assigning the receiver function amplitude to the corresponding conversion position where the P-to-S conversion occurred.Utilizing the conversion amplitude variation with depth as an optimization objective,imposing reliable prior constraints on the structural model frame and velocity range,and adopting a stepwise search inversion technique,this method efficiently weakens the tendency of easily falling into the local extremum in conventional receiver function inversion.Synthetic tests show that the CCA inversion can reconstruct complex crustal velocity structures well and is especially suitable for revealing crustal evolution by estimating diverse velocity distributions.Its performance in reconstructing crustal structure is superior to that of the conventional receiver function imaging method. 展开更多
关键词 crustal imaging receiver function depth domain inversion
暂未订购 下载PDF
Preliminary study of lateral variation in crustal structure of Northeast China from teleseismic receiver functions 认领 引用 被引量：1
18
作者 Youlin Chen Ruifeng Liu +1 位作者 Zhibin Huang Li Sun 《Earthquake Science》 CSCD 2011年第1期15-25,共11页
We conducted comprehensive receiver function analyses for a large amount of high-quality broadband teleseismic waveforms data recorded at 19 China National Digital Seismic Network （CNDSN） stations deployed in Northe... We conducted comprehensive receiver function analyses for a large amount of high-quality broadband teleseismic waveforms data recorded at 19 China National Digital Seismic Network （CNDSN） stations deployed in Northeast China. An advanced H-κ domain search method was adopted to accurately estimate the crustal thickness and vp/vs ratio. The crust has an average thickness of about 34.4 km. The thinnest crust occurs in the central region of Northeast China, while the thickest crust is beneath the Yanshan belt. The vp/vs ratio is relatively uniform with an average of about 1.733. The highest vp/vs ratio is found beneath the Changbaishan, likely associated with its volcanic activities. We found significant lateral heterogeneity beneath three stations CN2, MDJ, and MIH located along the Suolon suture from the back-zimuthal dependence of Moho depth. The velocity modeling from receiver functions indicated complicated Earth structure beneath these stations with large crust-mantle transition zone, noticeable velocity jump in upper mantle, and low velocity zone in middle crust. Dipping velocity interface in the crust with strike approximately parallel to the Suolon suture and down-dip to the south or southeast might explain the observed lateral heterogeneity. 展开更多
关键词 Moho crust receiver function lateral heterogeneity
暂未订购 下载PDF
Crustal structure beneath Qiangtang and Lhasa terrane from receiver function 认领 引用 被引量：4
19
作者 李永华 吴庆举 +3 位作者 田小波 曾融生 张瑞青 李红光 《Acta Seismologica Sinica(English Edition)》 2006年第6期633-642,共10页
To determine the crustal structure in central Tibet, we used teleseismic waveform data recorded by 18 stations in the INDEPTH-Ⅲ seismic array across the central Tibet from the central Lhasa terrane to the central Qia... To determine the crustal structure in central Tibet, we used teleseismic waveform data recorded by 18 stations in the INDEPTH-Ⅲ seismic array across the central Tibet from the central Lhasa terrane to the central Qiangtang terrane. The S-wave velocity structures beneath stations are determined by inverting the stacked radial receiver function using the GA method. The first order features in the receiver function are modeled. Our results show that the Moho in Qiangtang is about 8 km shallower than that in Lhasa terrane along the INDEPTH-Ⅲ profile. It maybe suggests the northward subduction of the Lhasa mantle lid beneath the Qiangtang terrane is affected by the India-Asia collision. We conclude that there exist low velocity zone in the middle crust across the northern Lhasa and Qiangtang terrane, which can be related to the high temperature upper mantle beneath that. 展开更多
关键词 Tibetan Plateau receiver function low velocity zone crustal thickness
暂未订购 下载PDF
Receiver function structures beneath the Haiyuan fault on the northeastern margin of the Tibetan plateau 认领 引用 被引量：4
20
作者 Yutao Shi Yuan Gao Laiyu Lu 《Earthquake Science》 2021年第4期367-377,共11页
We performed a receiver function analysis on teleseismic data recorded along two dense seismic profiles and from 4 broadband regional seismic stations across the northeastern Tibetan plateau.The crustal thickness and ... We performed a receiver function analysis on teleseismic data recorded along two dense seismic profiles and from 4 broadband regional seismic stations across the northeastern Tibetan plateau.The crustal thickness and vP/vS ratio were measured by the H-κdomain search algorithm.The Moho discontinuity across the Haiyuan arc fault zone was also revealed by common conversion point(CCP)imaging.Our study results show that the crustal thickness and the vP/vS ratio were 42–56 km and 1.60–1.88,respectively.The crustal thickening on the northeastern margin indicates that the crust is shortening or that there was a superimposition of crusts during the collision of the Tibetan plateau with Eurasian block.Our results suggest that Haiyuan fault likely resulted from the interactions of high temperature and pressure conditions during the collision of the Indian and Asian continents.The Moho beneath the Haiyuan tectonic region exhibits an obvious offset and a vague discontinuity according to CCP imaging.This study suggests that the Haiyuan arc fault zone is a trans-crustal fault that cuts through the Moho in the northeastern Tibetan Plateau.Moreover,there are indications of strong deformation in the intensive crustal extrusion from the interior of the Tibetan Plateau to its northeastern margin. 展开更多
关键词 Haiyuan fault Receiver function Crustal thickness vP/vS ratio
暂未订购 下载PDF
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
上一页 1 2 … 31 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈