可可西里——东昆仑活动构造带强震活动研究

STRONG EARTHQUAKE ACTIVITIES IN KEKEXILI——EAST KUNLUN MOUNTAINS ACTIVE FAULT ZONE, NORTHWEST CHINA

青海昆仑山口西 8.1级地震发生在具有新生性特征的可可西里—东昆仑活动断裂带上。该断裂带在 190 0年以来的 10 0多年中经历了一个强震活动过程。在该强震活动过程中 ,地震沿整个可可西里—东昆仑活动构造带分段破裂 ,强震的破裂长度和震级之间大致满足对数线性的统计关系 ,强震活动呈现指数型时间分布的加速特征。这种强震加速活动特征可以用含多个震源体的孕震系统的强震成组活动模型给予解释。

The Kunlanshan earthquake with M s8.1 occurred in the Kekexili East Kunlanshan Mountains active fault zone in 2001. The fault zone represents the neogenic character and a strong earthquake process has proceeded in this fault zone since 1900. In this process, earthquakes occurred along the whole fault zone and ruptured the zone segments. The lengths of surface rupture and the magnitudes of earthquakes statistically fit the logarithmic linearity relation approximately. The earthquakes activity represented an accelerative character that accord with exponential function in time domain. The character of earthquakes can be explained by a group of strong earthquake activities accelerative of a system which includes many seismic sources.