唐山老震区M≥4.0地震前b值变化异常特征研究

doi:10.12196/j.issn.1000-3274.2024.01.007

摘要/Abstract

摘要： 选取2009年1月至2022年12月唐山老震区的地震目录资料计算b值, 利用格点搜索法确定b值下降幅度较大(≥20%)的区域作为异常区, 分析该区域b值的时间变化特征, 结合b值的时空变化研究该区域发生M4.0以上地震的危险性。研究发现, 唐山老震区7次(组)M4.0以上地震均发生在b值下降幅度较大的区域边缘或附近, 表明应力较高的区域是地震危险区。异常区域内b值的时间变化显示, 7次(组)M4.0以上地震多在震前半年至一年出现b值下降的变化过程, 也反映了异常区域应力逐渐积累的过程。总体来说, b值的时空下降变化对唐山老震区M4.0以上地震的研判具有指示意义。

关键词: 唐山老震区, 异常特征, b值, 格点搜索

Abstract: We select the data of earthquake caralogue from January 2009 to December 2022 in Tangshan old seismic region to calculate the b-value. The lattice searching method is used to determine the abnormal area with a significantly decrease in b-value (≥20%), the time variation characteristics of the b-value in this area are analyzed, the risk of M4.0 and above earthquakes in the area is studied based on the b-value spatiotemporal variation characteristics. Research has found that 7 M≥4.0 earthquakes occurred at or near the edges of areas with significantly decrease in b-values in the Tangshan old earthquake area, which indicates that areas with high regional stress are high-risk areas for earthquake occurrence. According to the time changes of b values in the abnormal area, most of the 7 M≥4.0 earthquakes (groups) experienced a decrease in b values from half a year to one year before the earthquake, which also reflects the gradual accumulation of stress in the abnormal area. The b-value decrease in time and space has indicative significance for the study and judgment of earthquakes above M4.0 in the Tangshan old seismic region.

Key words: Tangshan old seismic region, Anomalous characteristics, b value, Lattice searching

中图分类号:

P315.7

岳晓媛, 李艳娥, 钟世军, 王薇, 王燕, 马梁. 唐山老震区M≥4.0地震前b值变化异常特征研究[J]. 地震, 2024, 44(1): 94-108.

YUE Xiao-yuan, LI Yan-e, ZHONG Shi-jun, WANG Wei, WANG Yan, MA Liang. Anormalies of b-value Changes before M≥4.0 Earthquake in Tangshan Old Seismic Region[J]. EARTHQUAKE, 2024, 44(1): 94-108.

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