由断层活动特征探讨地震活动的前兆信息——首都圈三次M_s≥6.0级地震的启示

Precursory Information Explored from Fault Activities——Enlightenment of Three Earthquakes with M_s≥6 Occurred in the Capital Circle

一、前言 1966年邢台地震后,特别是1970年以后,在我国一些主要的活动断裂上布设了多处断层位移测量点。试图通过研究断层现今活动特征探寻断层活动与地震活动之间的相互联系,捕捉地震的前兆信息,为地震预报提供依据。多年的观测结果表明,在强震前后断层确实有明显的异常活动,如海城7.5级地震、唐山7.8级地震、道孚7.2级地震、中缅边境7.3级地震,大同—阳高6.1级地震、张北6.2级地震以及甘肃永登5.

Anomalous variations have appeared in some fault displacement observatories before and after three earthquakes with M_S≥6 occurred in the capital circle in recent years. Observatory data demonstrate that fault activities were strongly interrelated with earthquake occurrences. During strong earthquake preparation processes, some faults often appear corresponding anomalous activities. Therefore, fault displacement observation is one of important techniques for earthquake prediction research. Our study also shows that the range of anomalous observatory distribution is related with earthquake magnitude; i.e. the larger the anomalous range distributed the higher the shock magnitude forthcoming.