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《Earth Science Frontiers》 2007-06
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Seismogenic tectonic environment of 1976 great Tangshan earthquake:results given by dense seismic array observations

Liu Qiyuan,Wang Jun,Chen Jiuhui, Li Shuncheng,Guo BiaoState Key Laboratory of Earthquake Dynamics,Institute of Geology,China Earthquake Administration,100029 Beijing,China  
In July 28,1976,the great Tangshan earthquake shocked the whole world and occurred in the Tangshan area of Hebei Province.An important question is why such a large earthquake occurred within the ancient North China craton.It is worth considering whether a similar event will reoccur in the Tangshan region.In this study,using the receiver-function inversion technique and teleseismic P waveform data recorded at the Capital Circle Seismic Network and our movable seismic array,we investigated the 3D S-wave velocity structure of the crust and upper mantle down to 60 km beneath the Tangshan area.Our results show that(1) the media beneath the Tangshan block cut by active faults are very different from the adjacent areas and all of the active faults surrounding the Tangshan block was through the whole crust;(2) in the upper and middle crust,there exist obvious heterogeneous low-velocity media beneath the Tangshan earthquake region;(3) the crust-mantle boundary has an obvious block uplift and,in comparison with both sides,the top anomalous uplift of the upper mantle beneath the Tangshan block reaches to 10 km,and the upper mantle beneath has an anomalous heterogeneous structure;(4) beneath the Tangshan earthquake region,there are probably massive intrusions derived from the upper mantle,which form the low-velocity body in the upper and middle crust.Because of our results having much higher resolution than previous results,some new features of the crust and upper mantle velocity structure could be shown in this study;(5) The locations of destructive earthquakes are not random and are related closely to their deep structure of the crust and upper mantle.This provides a possibility of correctly estimating the location of destructive earthquakes.Based on our results,we discuss the genesis of the Tangshan earthquake.We consider that the main dynamic source for the Tangshan earthquake is the vertical movement of the upper mantle,which leads to material and energy exchange between the crust and upper mantle.The horizontal stress field plays a subordinate role.This observation facilitates our understanding of why the Tangshan earthquake with the magnitude larger than 7.0 occurred within the North China craton.A problem worth-considering is whether there is a possibility that same magnitude events will reoccur in the Tangshan region.
【Fund】: 国家重点基础研究发展计划“973”项目(G1998040702) 中国地震局监测预报司的资助
【CateGory Index】: P315
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