摘要
作为青藏高原南东向"挤出逃逸"的重要通道,青藏高原东缘中南部具有大型走滑断裂广泛发育和地震活动强烈而频繁的特征.本文使用线性球面块体模型理论,在前人活动地块研究的基础上吸收新近研究成果,建立研究区三维块体几何模型,使用1999—2007年的GPS数据反演得到青藏高原东缘中南部主要活动断裂滑动速率.使用反演得到的滑动速率和最优断层闭锁深度估算了川滇菱形块体主要边界和其内部断裂的地震矩积累,并利用历史强震目录估算了地震矩释放,在比较两者差异的基础上得到了研究区地震矩亏损(未释放的地震矩)较大的断层和断层段,该结果可以作为研究区强震中长期危险性研究的参考.
As one of the most important pathways for southeastward extrusion of Tibet plateau, the mid and south part of the eastern margin of Tibet plateau feature widespread active faults, intensive and frequent seismic activity. In this paper, we use the spherical linear block theory constrained by geodetic observations from Global Positioning System （GPS） stations to estimate fault slip rates in the mid and south part of the eastern margin of Tibet plateau. The 3D geometric block model is based on the previous researches of active block, considering the latest research works in this field. Using these slip rates and optimal locking depths, the rates of moment accumulation on the major faults are estimated. And then we compared them with the seismic moment released on each fault using the historical earthquake catalog. The result shows that there are six faults or fault segments with large moment deficits in the research area; it may be helpful for the middle-long term strong earthquake hazard study.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
2014年第4期1062-1078,共17页
Chinese Journal of Geophysics
基金
国家自然科学基金项目(41174083)
地震行业科研重大专项(201208009)资助
关键词
青藏高原东缘中南部
线性球面块体模型
GPS
断层滑动速率
地震矩亏损
Mid and south part of the eastern margin of Tibet plateau
Spherical linear blocktheory
GPS
Fault slip rate
Seismic moment deficit
