川滇地区近期地壳运动的应变积累  

ON STRAIN ACCUMULATION OF RECENT CRUST MOVEMENT IN SICHUAN-YUNNAN AREA

作　　者：张希[1] 张四新[1] 王双绪[1] 张晓亮[1] 陆明勇[2] 王文萍[1] 

机构地区：[1]中国地震局第二监测中心,西安710054 [2]中国地震应急搜救中心,北京100049

出　　处：《大地测量与地球动力学》2007年第4期8-15,共8页Journal of Geodesy and Geodynamics

基　　金："十一五"国家科研计划支撑项目(2006BAC01B02-02-03);地震科学联合基金(A07130);国家自然科学基金(40674010)

摘　　要：利用1994～2006年川滇地区GPS和区域水准观测资料,借助弹性块体边界负位错模型,结合近年来跨断层形变总体特征,研究了川滇地区构造块体及其边界断裂的应变积累状况与强度。分析结果表明:目前川滇地区总体呈现能量积累为主的构造应力态势;安宁河断裂及其与则木河断裂、鲜水河断裂交汇区,盐源-丽江地块及其边缘附近反映出相对高的应变能积累背景及可能的中-短期地震前兆特征。By use of the regional leveling and GPS observations in Sichuan-Yunnan area during 1994 - 2006, aided by the negative dislocation model for the elastic block boundaries, combining with the total characteristics of deformation cross-fault, the recent status and intensity of strain accumulation of tectonic blocks and their boundary faults in Sichuan-Yunnan area are studied. The results show that recent status of tectonic stress in Sichuan-Yunnan area manifes itself in energy accumulation mainly. The strain energy accumulation appears obviously in the Anninghe fault and the regions where it meets Zemuhe fault and Xianshuihe fault, the Yanyuan - Lijiang block and its margins, it may be the medium and short-term precursors of some coming earthquakes.

关 键 词：负位错模型 GPS和区域水准资料 跨断层形变 应变积累 川滇地区 

分 类 号：P315.725[天文地球—地震学]