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Determination of the crustal structure and seismicity of the Linfen rift with S-wave velocity mapping

Frontiers of Earth Science 2020年第3期14卷 647-659页

作者： Zigen Wei Risheng Chu Meiqin Song Xiaolin Yang Shanshan Wu Feng Bao State Key Laboratory of Geodesy and Earth’s Dynamics Innovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan430077China Earthquake Administration of Shanxi Province Taiyuan030021China Shaanxi Earthquake Agency Xi’an710068China Shanghai Earthquake Agency Shanghai200062China

The Linfen rift is a Cenozoic extensional rift with significant seismicity and seismic *** of this rift shed light on deep dynamic processes and seismogenic mechanisms relevant to crustal structure and seismic *** first conducted a joint inversion of receiver functions and surface wave dispersion on waveform data collected from 27 broadband seismic stations to image the crustal S-wave velocity in the Linfen rift and its *** then relocated the source parameters for 10 earthquake events with depths>20 km and studied the relationship between crustal S-wave velocity and *** results show that low-velocity zones of different scales exist in the middle-lower crust,and that the depth of the seismogenic layer gradually increases from^25 km in the south to^34 km in the north,roughly corresponding to the bottom of the low-velocity *** found that most of the relocated earthquakes occurred in the low-velocity zone at depths of 18 km to 34 km,with the deepest at 32 *** of the greatest historic earthquakes,Linfen(Ms 7.75)in 1695 and Hongtong(Ms 8.0)in 1303,occurred at the bottom of the high-velocity zone at depths of 12 km to 18 *** results,combined with previous studies,suggest that the upwelling mantle material below the rift did not remarkably affect the velocity structure from the bottom of the seismogenic layer down to the uppermost mantle nor heat the *** is likely that neither crustal-scale faults nor mantle earthquakes exist in the Linfen rift.

关键词： Linfen rift joint inversion S-wave velocity seismogenic layer deep crustal earthquake

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Study on S wave velocity structure beneath part stations in Shanxi Province

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Acta Seismologica Sinica(English Edition) 2003年第4期16卷 359-370页

作者：张学民束沛镒刁桂苓 School of Geophysics and Information Technology China University of Geosciences Beijing 100083 China Seismological Bureau of Hebei Province Shijiazhuang 050021 China Institute of Geology and Geophysics Chinese Academy of Science Beijing 100101 China Seismological Bureau of Hebei Province Shijiazhuang 050021 China

Based on S wave records of deep teleseisms on Digital Seismic Network of Shanxi Province, shear wave velocity structures beneath 6 stations were obtained by means of S wave waveform fitting. The result shows that the crust is thick in the studied region, reaching 40 km in thickness under 4 stations. The crust all alternatives high velocity layer with low velocity one. There appear varied velocity structures for different stations, and the stations around the same tectonic region exhibit similar structure characteristics. Combined with dominant depth distribution of many small-moderate earthquakes, the correlation between seismogenic layers and crustal structures of high and low velocity layers has been discussed.

关键词： S wave waveform fitting velocity structure low velocity layer seismogenic layer

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Multi-layer Strain Rate Field Controlled by Netlike Plastic-Flow in the Lithosphere in Central-Eastern Asia

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Earthquake Research in China 2006年第3期20卷 326-338页

作者： Wang Sheng-zu State Key Laboratory of Earthquake Dynamics Institute of Geology CEA Beijing 100029 China

According to the ＂Netlike Plastic-Flow （NPF）＂ continental dynamics model, the transition of the deformation regime from brittle in shallow layers to ductile in deep layers in the lithosphere, and the controlling effect of NPF in the lower lithosphere result in intraplate multilayer tectonic deformation. NPF is a viscous （plastic） flow accompanied by shear strain localization, forming a plastic-flow network in the lower lithosphere. The strain rates in the seismogeulc layer can be estimated using the ＂earthquake-recurrence-interval＂ method, in which the strain rate is calculated in terms of the recurrence interval of two sequential earthquakes and the seismic probability of the second earthquake. The strains in the lower lithosphere are estimated using the ＂conjugate-angle＂ method, which takes the relationship between the conjugate angles and the compressive strains of the network, and calculates the characteristic strain rates in this layer from the strains and the durations of deformation inferred. The contour map of characteristic maximum principal compressive strain rates in the lower lithosphere in central-eastern Asia given in the paper shows strain rates with magnitudes on the order of 10^-15 - 10^-14/s in this region. The strain rates within the plastic-flow belts, which control seismic activities in the seismogeulc layer, are greater than the characteristic strain rates of the network and, in addition, the strain rates and seismic activities in the seismogeulc layer are also influenced by other factors, including the directive action of driving boundary along the upper crust, the effects of plastic-flow waves and the existence of the transitional weak layer distributed discontinuously between the upper and lower layers. The comparison between the strain rates in the seismogeulc layer and the characteristic strain rates in the lower lithosphere for 11 potential hypocenter areas in the region from the Qinghai-Xizang （Tibet） plateau to the North China plain ind

关键词： Central-eastern Asia Lower lithosphere seismogenic layer Shallow crust Strainrate

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Seismic structure and rheology of the crust under China's mainland

Seismic structure and rheology of the crust under China's ma...

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中国科学院地质与地球物理研究所2013年度（第13届）学术年会

作者： Zhongjie Zhang Yangfan Deng Lin Chen Jing Wu Jiwen Teng Giuliano Panza State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences Guangzhou Institute of Geochemistry Chinese Academy of Sciences Department of Mathematics and Geosciences University of Trieste International Centre for Theoretical Physics SAND group Institute of Geophysics China Earthquake Administration

The crust and upper mantle in China’s mainland were relatively densely probed with wide-angle seismic profiling since 1958,and the data have provided constraints on the amalgamation and lithosphere deformation of the continent,Based on the collection and digitization of crustal P-wave velocity models along related wide-angle seismic profiles,we construct several crustal transects across major tectonic units in China’s mainland,In our study,we analyzed the seismic activity,and seismic energy releases during 1970 and 2010 along them,We present seismogenic layer distribution and calculate the yield stress envelopes of the lithosphere along the transects,yielding a better understanding of the lithosphere rheology strength beneath China’s mainland,Our results demonstrate that the crustal thicknesses of different tectonic provinces are distinctively different in China’s mainland,The average crustal thickness is greater than 65 km beneath the Tibetan Plateau,about 35 km beneath South China,and about 36-38 km beneath North China and Northeastern *** the basins,the thickness is-55 km beneath Qaidam,～50 km beneath Tarim,～40 km beneath Sichuan and-35 km beneath *** study also shows that the average seismic P-wave velocity is usually slower than the global average,equivalent with a more felsic composition of crust beneath the four tectonic blocks of China’s mainland resulting from the complex process of lithospheric evolution during Triassic and Cenozoic continent -continent and Mesozoic ocean-continent *** identify characteristically different patterns of seismic activity distribution in different tectonic blocks,with bi-,or even tri-peak distribution of seismic concentration in South Tibet,which may suggest that crustal architecture and composition exert important control role in lithosphere *** calculated yield stress envelopes of lithosphere in China’s mainland can be divided into three *** results indicate that the lithosphere rh

关键词： China’s mainland Crustal structure seismogenic layer Yield stress envelope Lithosphere deformation

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