甘肃及其边邻地区断层形变特征强度时序变化与强震关系

利用甘肃及其边邻地区20世纪80年代末至2009年11月跨断层短水准流动观测资料,提取相关断裂带各段的断层形变特征强度指标,分析其可能揭示的构造变形动态演化特征及与资料积累以来MS5.8级以上地震孕育—发生过程的关系。研究表明:各断裂段断层形变特征强度时序曲线对其内、边缘附近MS5.8级以上地震反映较好,震前数月至1年左右时间内多数对应与构造背景一致的逆断异常;震后异常消失,或者出现短暂的正断异常,反映调整状态。

Time evolution of fault deformation feature intensity and its relationship with strong earthquakes in Gansu and its neighborhood

Using cross-fault mobile short-leveling observational data from late 1980s to November 2009 in Gansu and its neighborhood, the deformation feature intensity of related fault segments are computed, the dynamic evolution features and their relationship with the generation of earthquakes over MsS. 8 are studied. It is concluded that the time-curves of de- formation feature intensity of all segments reflected the earthquakes over MsS. 8 on the faults or nearby, displaying thrust abnormity in accordance with their tectonic background from several months to about one year before the earthquakes. After these earthquakes, the abnormity disappeared, or appeared just as transitory normal abnormity （adjustment state）.