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Title:: Physical Bases of Common Characteristics of Short-Term and Impending-Earthquake Precursor Anomalies before a Strong Earthquake

Author(s):: CHEN Li-de; FU Hong; WU Cheng-dong; (Earthquake Administration of Yunnan Province,Kunming 650224,Yunnan,China)

Keywords:: strong earthquake; short-term and impending-earthquake precursor anomaly; common characteristic; physical base

摘要:: 强震短临阶段前兆异常的共性特征是“一多、二大、三广、四平静”。通过讨论“一多、二大、三广”这三项微观前兆异常特征的物理基础,提出用“软包体模型”和信息论中系统处于临界点附近时信息会突然增强的理论,可以对上述共性特征做出解释。

Abstract:: The precursor anomalies in short-term and impending-earthquake period of a strong earthquake have common characteristics as follows:(1)the number of precursor anomalies is more than before;(2)the change amplitudes of some precursor anomalies are larger;(3)the distribution of precursor anomalies is wider;(4)the earthquakes(M≥4)are quiescent in a quite wide region.The first three characteristics are microcosmic precursor anomaly characteristics; we discussed their physical bases in this paper.We think the soft inclusion model and the theory of information increasing abruptly while the system has been at a critical point can explain these common characteristics.