滇西区域水准观测的负位错反演与应变积累分析  

Inversion of Negative Dislocation for Regional Level Observation and Analysis of Strain Accumulation in West Yunnan

作　　者：张希[1] 江在森[2] 张四新[1] 王双绪[1] 

机构地区：[1]中国地震局第二监测中心,西安71005 [2]中国地震局地震预测研究所,北京100036

出　　处：《地震研究》2007年第3期216-222,共7页Journal of Seismological Research

基　　金：中国地震局地震科学联合基金(A07130);"十一五"国家科研计划支撑项目(2006BAC01B02-02-03)共同资助.

摘　　要：利用1981～2006年滇西地区5个时段的区域水准观测资料,借助负位错模型反演,参考典型大震应力触发计算及跨断层等形变观测结果,研究了活动块体边界断裂应变积累的状况、分段差异性、时空演变及其与强震孕育—发生过程的关系。结果表明,该区6级以上地震多发生在断裂强锁定段或锁定程度显著加强段及其附近;目前宾川—南华以南、南涧以北,洱源、丽江一带可能反映相对较高的应变能积累背景,南定河断裂附近反映一定程度的应变积累特性。We used negative dislocation model to inverse the 1981 -2006 regional level observation data of West Yunnan on the basis of the stress triggering computation and across-fault observation data, thus studying the strain accumulation status and difference of the tectonic blocks＇ boundary faults, the time-space evolution and the relationship with the process of the development and occurrence of strong earthquakes. The result shows ： （ 1 ） in this area, most earthquakes with magnitude over 6 occurred on the locked segments or obviously enhanced locked segments of the blocks＇ boundary faults and nearby; （2） presently the region south of Binchuan-Nanhua and north of Nanjian and the region from Eryuan to Lijiang reveal the background of obvious strain accumulation, while around the Nandinghe fault appears the strain accumulation to some degree.

关 键 词：区域水准 负位错模型 应力触发模型 应变积累 滇西地区 

分 类 号：P315.2[天文地球—地震学]