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three-dimensional p-wave velocity structure of the Crust of North China

Journal of China University of Geosciences 2007年第3期18卷 257-268页

作者：魏文博叶高峰李艳军金胜邓明景建恩 State Key Laboratory of Geological processes and Mineral Resources Geo-detection Laboratory Ministry of Education School of Geophysics and Information Technology China University of GeosciencesBeijing 100083China

Since the Xingtai （邢台） earthquake in 1966, China Earthquake Administration has carried out a survey campaign along more than thirty deep seismic sounding （DSS） profiles altogether about twenty thousand kilometers long in North China to study the velocity structure of the crust and the upper mantle in this region, and has obtained a great number of research findings. However, these researches have not provided a 3D velocity structure model of the crust of North China and cannot provide seismic evidence for the study of the deep tectonic characteristics of the crust of the whole region. Hence, based on the information from the published data of the DSS profiles, we have chosen 14 profiles to obtain a 3D velocity structure model of North China using the vectorization function of the GIS software （Arc/Info） and the Kriging data gridding method. With this velocity structure model, we have drawn the following conclusions：（1） The p-wave velocity of the uppermost crust of North China changes dramatically, exhibiting a complicated velocity structure in plane view. It can be divided into three velocity zones mainly trending towards north-west. In the research area, the lowest-velocity zones lie in the Haihe （海河） plain and Bohai （渤海） Bay. Although the geological structure of the sedimentary overburden in the study area is somewhat inherited by the upper crust, there are still several differences between them. （2） Generally, the p-wave velocity of the crust increases with depth in the study area, but there still exists local velocity reversion. In the east, low-velocity anomalies of the Haihe plain gradually disappear with increasing depth, and the Shanxi （山西） graben in the west is mainly characterized by relatively low velocity anomalies. Bounded by the Taihang （太行） Mountains, the eastern and western parts differ in structural trend of stratum above the crystalline basement. The structural trend of the Huanghuaihai （黄淮海） block in the east is mainly north-east, while that of t

关键词： North China crust deep seismic sounding three-dimensional p-wave velocity structure

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three-dimensional crustal p-wave velocity structure in the Yangbi and Eryuan earthquake regions, Yunnan, China

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Earthquake Science 2021年第4期34卷 358-366页

作者： Jia Jia Qingju Wu Fuyun Wang Geophysical Exploration Center China Earthquake AdministrationZhengzhou 450002China Institute of Geophysics China Earthquake AdministrationBeijing 100081China

A magnitude 5.5 earthquakes occurred in Eryuan County,Dali Bai Autonomous prefecture,Yunnan province,China,on March *** a magnitude 5.0 earthquake occurred in the same place on April 17,2013,i.e.,45 days ***,on May 21,2021,multiple earthquakes,one with magnitude 6.4 and several at 5.0 or above,occurred in Yangbi County,Dali Bai Autonomous prefecture,Yunnan province,*** of these occurred in the Weixi-QiaohouWeishan fault *** this study,1,874 seismic events in Yangbi and Eryuan counties were identified by automatic micro-seismic identification technology and the first arrivals were picked up *** this,a total of 11,968 direct p-wave absolute arrivals and 73,987 high-quality pwave relative arrivals were collected for joint inversion via the double difference tomography *** was done to obtain the regional three-dimensional fine crustal p-wave velocity *** results show that the travel time residuals before and after inversion decreased from the initial–0.1–0.1 s to–0.06–0.06 *** upper crust in the study area,which exhibited a low-velocity anomaly,corresponded to the basin region;this indicated that the low-velocity anomaly in the shallow part of the study area was affected by the *** also showed some correlation between the distribution of the earthquakes and velocity structure,as there was a lowvelocity body Lv1 with a wide distribution at depths ranging from 15–20 km in the Yangbi and Eryuan earthquake *** addition,earthquakes occurred predominantly in the highlow velocity abnormal transition *** low-velocity body in the middle and lower crust may be prone to concentrating upper crustal stress,thus leading to the occurrence of earthquakes.

关键词： Yangbi and Eryuan earthquakes double difference tomography three-dimensional p-wave velocity structure Weixi-Qiaohou-Weishan fault.

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