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本文描述了排除地震台站空间分布不均匀、台站观测项目数量不同等非地震成因因素影响后的前兆群体空间非均匀性研究思路及其指标Cv值,确定了Cv值反映的前兆群体空间分布图象的类型及其判定方法。利用Cv值对华北地区1995年以来的水氡短临前兆异常群体空间分布非均匀性及其与地震的关系进行了分析,结果表明,华北地区1995年1月1日至1998年2月1日发生的5次5级以上中强地震前,前兆群体空间分布出现5次非均匀性增强的过程,除离观测台网较远,于1996年11月发生的南黄海62级地震位于前兆群体非均匀性增强过程即将结束的时段外,其余4次地震均发生在前兆群体非均匀性增强过程结束、恢复均匀分布的时间段内。本文通过对已有岩石力学实验和震例研究成果的综合论述,探讨了短临前兆群体非均匀性的物理、力学成因机制。
This paper describes the research ideas and index Cv values of precursory population spatial heterogeneity excluding the influence of non-seismic factors such as the uneven spatial distribution of seismic stations and the number of station observation items, and determines the spatial distribution of precursor groups reflected by Cv values The type of image and its determination method. The Cv values were used to analyze the heterogeneity of spatial distribution of short antecedent precursory anomalies of water radon in North China since 1995 and their relationship with earthquakes. The results show that in North China, from January 1, 1995 to February 1, 1998 Before the occurrence of more than 5 moderate-level earthquakes of magnitude 5 or above, the spatial distribution of precursors increased five times in a non-uniform manner. In addition to being far away from the observation network, the 62-magnitude South Yellow Sea earthquake, which occurred in November 1996, The four other earthquakes occurred during the time when the process of enhancing the heterogeneity of the precursors was ended and the restoration was uniform even after the period of time when the uniformity enhancement process was coming to an end. In this paper, through the comprehensive discussion of the existing rock mechanics experiments and earthquake case research results, the physical and mechanical mechanism of non-uniformity of short-precursor precursors population is discussed.