关键词: 走滑断裂带, 地震破裂, 分段性, 段边界, 四川

Abstract: Based on several types of data, segmentation and its cause, earthquake ruptures along the Xianshuihe-Anninghe-Zemuhe fault zone in western Sichuan are analyzed from various aspects. The fault zone is divided into 12 rupture-segments for characteristic earthquakes. Along this fault zone, the persistent and non-persistent boundaries of ruptures have almost the same number ratio of 2%. The persistent and important boundaries can be identified by criteria such as geometry, structure and active behavior of faults. They terminate the propagation of earthquake ruptures by partly volume-changing there. The non-persistent boundaries can be identified by criteria such as extension and recurrence behavior of earthquake ruptures, spatial difference of current active behavior of faults, composition of both relatively small-scale geometric barriers and release barriers. Locations of the non-persistent boundaries may vary with time. Relatively small overlap occurs between adjacent ruptures if the time interval between them is shorter, and relatively large overlap appears between adjacent ruptures if the time interval between them is longer.

Key words: Strike-slip fault zone, Earthquake rupture, Segmentation, Segment boundary, Sichuan