Analysis on small-earthquake composite fault plane solutions from 1961 to 1999 in Xinfengjiang reservoir area  

作　　者：郭贵安 刘特培[2] 秦乃岗[2] 陈丽芬[2] 

机构地区：[1]Shenzhen Seismostation, Shenzhen 518003, China [2]Earthquake Administration of Guangdong Province, Guangzhou 510070, China

出　　处：《地震学报》2004年第3期261-268,共8页Acta Seismologica Sinica

基　　金：Seismic Research Foundation of Residential Office in Shenzhen; China Earthquake Administration (2003-1000).

摘　　要：To understand the earthquake characteristics in Xinfengjiang (XFJ for short) reservoir area, we collected the small earthquakes occurred in the area from 1961 to 1999. We segmented this 40-year period, parted the research region and calculated the composite fault plane solution of each block, disscussed the effect characteristics of stress field of water pressure using Mohrs stress circle. The final result shows that the main rupture pattern was very different before and after the M = 6.1 main shock, changing from strike slip to normal rupture. The maximum principal stress axes of composite fault plane solutions are characterized by synchronous change with water level.To understand the earthquake characteristics in Xinfengjiang (XFJ for short) reservoir area, we collected the small earthquakes occurred in the area from 1961 to 1999. We segmented this 40 year period, parted the research region and calculated the synthetic mechanism of each block, disscussed the effect characteristics of stress field of water pressure using Mohr′s stress circle. The final result shows that the main rupture pattern was very different before and after the M =6.1 main shock, changing from strike slip to normal rupture. The maximum principal stress axis of synthetic mechanisms is characterized by synchronous change with water level.

关 键 词：新丰江水库 莫尔应力圆 小震综合机制解 

分 类 号：P315.3[天文地球—地震学]