昆明盆地及周边地区第四纪构造应力场分析  

Quaternary Tectonic Stress Field in the Region of the Kunming Basin

作　　者：杜义[1] 荆振杰[1] 谢富仁[1] 

机构地区：[1]中国地震局地壳应力研究所,北京德外西三旗100085

出　　处：《中国地震》2009年第1期31-40,共10页Earthquake Research in China

基　　金：中央级公益性科研院所基本科研业务专项(ZDJ2007-8);国家科技支撑项目(2006BAC13B01)

摘　　要：昆明盆地是一个受南北向活动断裂控制的新生代断陷盆地,在昆明盆地及其周边地区地质构造复杂,活动断裂十分发育,且活动性较强。野外地震地质调查和断裂滑动观测表明:区内南北向断裂主要表现为左旋走滑和逆断两种运动方式,北东、北西向断裂以走滑运动为主,左右旋兼而有之。通过对研究区内32个测点的断层擦痕测量,共获得了1527条断层滑动数据,利用由断层滑动资料反演构造应力张量的方法,计算获得了研究区第四纪以来两期主要构造应力作用:第一期为早、中更新世,构造应力作用以近东西向挤压和近南北向拉张为特征;第二期自晚更新世至今,构造应力作用以北北西-南南东向挤压和北东东-南西西向拉张为特征。The Kunming basin is a new generation faulted basin which is subjected to the control by the south-north active faults. In around the Kunming basin region, there are totally 8 main active faults. Field seismic geological surveys and fault slip observations indicate that stress field in the region of Kunming basin has two major stages. In the first stage （from late-Pliocene to mid-Pleistocene）, the tectonic stress field is characteristic of nearly E-W compression and nearly N-S extension. In the second stage （from late-Pleistocene to the present）, the tectonic stress field is mainly characteristic of NNW-SSE compression and NEE-SWW extension. In this stress field, the nearly N-S faults in the region mainly show a lateral slip.

关 键 词：昆明盆地 断层滑动 第四纪 构造应力场 演化 

分 类 号：P315[天文地球—地震学]