Study on determination of stress level by seismic stress drops and the stress axis de-flections before and after large earthquakes  

作　　者：万永革 

机构地区：[1]Institute of Geophysics,China Earthquake Administration [2]Institute of Disaster Prevention Science and Technology,Hebei 065201,China

出　　处：《Acta Seismologica Sinica(English Edition)》2006年第5期507-513,共7页

基　　金：National Natural Science Foundation of China (40374012) and State Key Fundamental Research Development Plan Project (2001CB711005).

摘　　要：To obtain the stress level at the earthquake source, this paper sets forth the solution of the stress magnitude at the earthquake source by seismic stress drop and the stress axis deflections before and after large earthquakes. The pre-seismic and post-seismic stress direction can be statistically determined by a large collection of foreshock and aftershock focal mechanism data while the stress drop can be determined through the source fracture inversion from seismic wave data or crust deformation data. The paper attempts to make a fundamental contribution to seismic dynamics.To obtain the stress level at the earthquake source, this paper sets forth the solution of the stress magnitude at the earthquake source by seismic stress drop and the stress axis deflections before and after large earthquakes. The pre-seismic and post-seismic stress direction can be statistically determined by a large collection of foreshock and aftershock focal mechanism data while the stress drop can be determined through the source fracture inversion from seismic wave data or crust deformation data. The paper attempts to make a fundamental contribution to seismic dynamics.

关 键 词：stress level seismic stress drop stress axis deflection 

分 类 号：P315.727[天文地球—地震学]