Shallow velocity structure and hidden faults of Kunming city region

作     者：于更新 楼海 王椿镛 符力耘 张建国 秦嘉政 杨润海 李海鸥 

作者机构：Institute of Geology and GeophysicsChinese Academy of Sciences Institute of GeophysicsChina Earthquake Administration Earthquake Administration of Yunnan Province  4. Institute of GeologyChina Earthquake Administration 

出 版 物：《Earthquake Science》 (地震学报(英文版))

年 卷 期：2008年第21卷第5期

页      面：502-508+554页

核心收录：

学科分类：070801[理学-固体地球物理学] 07[理学] 0708[理学-地球物理学] 

基　　金：Basic Scientific Research Program of Institute of Geology, China Earthquake Administration (DF-IGCEA-0608-2-8) State Key Basic Research Development and Programming Project of China (2004CB418401) 

主　　题：finite-difference velocity structure hidden fault Puduhe-Xishan fault 

摘      要：In order to image the 3-D velocity structure of its shallow crust in Kunming region,China,finite-difference seis-mic tomography is used to invert the seismic data selected carefully from six-shot data. The result lays a founda-tion for the discussion of the relationship between the obtained velocity structure and the hidden faults,and for the illumination of the depth extents of main active faults surrounding Kunming city. Puduhe-Xishan fault lies on the western margin of the Kunming basin and is just situated on the west edge of the low velocity anomaly zone found at all depth levels. This indicates that this fault is a borderline fault of the Kunming basin. It can be concluded that the fault dips eastwards with a steep angle and its depth extent is large. Puji-Hanjiacun fault and Heilong-tan-Guandu fault play a role in controlling the low velocity anomaly zone in middle basin. The depth extents of the two faults are comparatively small,without traversing the interface of basin floor.