四川马边地震地质背景浅探

马边是川南地震活动较活跃的地区，地震活动显示出一种与四川其它地区不同的特点。马边地区地震活动具有地台区地震活动的一般规律，即地震活动与荥经一马边一盐津深大活动断裂带和上、下地壳间的滑脱面有关。该地区的6．0级以上强震与川西地区的强震活动相一致，它们受到地表活动断裂的控制；6．0级以下地震则与地表活动断裂关系不密切，呈现出一种弥散的图像，但其空间展布范围不超过荥经—马边—盐津深大活动断裂带所展布的区域。

Seism-geological background study about Mabian region

The seismic feature of Mabian region is different from that of anywhere in Sichuan province.The seismicity in this region is characterized by the earthquake activities of platform and is related to the deep and large fault of the upper and lower cruste.The earthquakes with M6.0 or over are comtrolled strictly by the active fault.But some unrecognized earthquakes occurred along the deep and large Yingging-Mabian-Yanjin extended zones.