汶川M_S8.0地震孕震机理的形变证据与模型推演  

Deformation Evidence and Model Deduction about the Generation Mechanism of the Wenchuan M_S8.0 Earthquake

作　　者：薄万举[1] 杨国华[1] 张风霜[1] 

机构地区：[1]中国地震局第一监测中心,天津300180

出　　处：《地震》2009年第1期85-91,共7页Earthquake

基　　金：天津市基金项目;汶川大震科考预研究项目

摘　　要：该文展示了汶川MS8.0地震区域南部多年流动水准测量给出的形变隆起图像、震前川滇地区GPS给出的区域无旋转基准下的两期水平形变图像、发震断裂带上耿达跨断层短水准震前变化以及GPS给出的震源区同震水平形变和垂直形变图像。经综合推演,给出了一个板内逆冲型强烈地震孕育发生的模型,简称为"压升冲降"模型,可使上述各异常变化的形变图像得到比较统一和一致的解释。This paper presents the ground raising image of the area to the south of the epienter of the Wenchuan Ms8.0 earthquake obtained from years＇ mobile leveling, the variation curve of Gengda short leveling across the fault on the epicenter, and the vertical and horizontal crust movement monitored by GPS in the area around the epicenter. A model for the generation of strong intra-plate thrust earthquake, shortly called PUTDOWN （ Press-Up and Thrust-Down） Model, is developed by integrated analysis and deduction, by which all the anomalies showed in the figures can be well understood coincidently.

关 键 词：汶川地震 孕震机理 形变 模型 水准 GPS 

分 类 号：P319.7[天文地球—固体地球物理学]