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

Abstract

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

CLC Number:

P315.7

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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Anormalies of b-value Changes before M≥4.0 Earthquake in Tangshan Old Seismic Region

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