Three-dimensional P velocity structure in Beijing area  

作　　者：于湘伟 陈运泰 王培德 

机构地区：[1]InstituteofGeophysics,ChinaSeismologicalBureau

出　　处：《Acta Seismologica Sinica(English Edition)》2003年第1期1-15,共15页

基　　金：Climbing Project Continental Dynamics of East Asia (95-S-05) from Ministry of Science and Technology, P. R. China.

摘　　要：A detail three-dimensional P wave velocity structure of Beijing, Tianjin and Tangshan area (BTT area) was deter-mined by inverting local earthquake data. In total 16 048 P wave first arrival times from 16048 shallow and mid-depth crustal earthquakes, which occurred in and around the BTT area from 1992 to 1999 were used. The first arrival times are recorded by Northern China United Telemetry Seismic Network and Yanqing-Huailai Digital Seismic Network. Hypocentral parameters of 1 132 earthquakes with magnitude ML=1.7~6.2 and the three-dimensional P wave velocity structure were obtained simultaneously. The inversion result reveals the com-plicated lateral heterogeneity of P wave velocity structure around BTT area. The tomographic images obtained are also found to explain other seismological observations well.A detail three-dimensional P wave velocity structure of Beijing, Tianjin and Tangshan area (BTT area) was deter-mined by inverting local earthquake data. In total 16 048 P wave first arrival times from 16048 shallow and mid-depth crustal earthquakes, which occurred in and around the BTT area from 1992 to 1999 were used. The first arrival times are recorded by Northern China United Telemetry Seismic Network and Yanqing-Huailai Digital Seismic Network. Hypocentral parameters of 1 132 earthquakes with magnitude ML=1.7~6.2 and the three-dimensional P wave velocity structure were obtained simultaneously. The inversion result reveals the com-plicated lateral heterogeneity of P wave velocity structure around BTT area. The tomographic images obtained are also found to explain other seismological observations well.

关 键 词：TOMOGRAPHY three-dimensional velocity structure seismic activity high velocity anomalies low velocity anomalies lateral heterogeneity 

分 类 号：P315.3[天文地球—地震学]