青藏块体东北缘断层形变与中强地震  

FAULT DEFORMATION AND MODERATE-STRONG EARTHQUAKES IN NORTHEASTERN MARGIN OF QINGHAI-TIBET BLOCK

作　　者：陈兵[1] 江在森[2] 马文静[3] 黎凯武[2] 薛富平[1] 

机构地区：[1]中国地震局第二地形变监测中心,西安710054 [2]中国地震局分析预报中心,北京100036 [3]青海省地震局,西宁810001

出　　处：《大地测量与地球动力学》2002年第4期49-55,共7页Journal of Geodesy and Geodynamics

基　　金：地震联合基金课题 (10 1118) ;"973"项目"大陆强震机理与预测"(G19980 40 70 3 ) ;"十五"短临预报攻关项目 (0 1- 0 3- 0 2 ) ;中国地震局构造物理开放实验室基金课题 (LTP0 10 2 )

摘　　要：对祁连山—海原断裂带近期断层形变特征进行了初步研究 ,发现多场地、大范围的断层活动异常是中等强度地震发生的显著背景 ,并且往往与大陆地震活动的阶段性总体状况相呼应 ;区域形变存在明显的特征量 ,包括特征形态和特征时间。同一场地在不同地震前的异常特征具有重复性 ,但会受到背景差异显著的不同地震的影响。目前形变累积状况表明研究区仍具有发生中强地震的地壳运动背景。Preliminary study of recent fault deformation features shows that many anomalies at observation sites in a large area are an obvious signal of medium strong earthquake, and it often mirrors stage characteristic of continent seismicity. There are eigen marks including eigen form and eigen time of deformation anomaly. In a special region, deformation anomaly at one site usualy shows the same features before different earthquakes, but can be affected by earthquakes which have different dynamic background. The situation of regional fault deformation acumulation implicate a medium strong earthquake coming in the future possibly.

关 键 词：断层形变 地震活动 地壳运动 空间分布 地震前兆 青藏块体 

分 类 号：P315.725[天文地球—地震学]