地震地磁观测与研究2025，Vol.46Issue(5)：21-27,7.DOI:10.3969/j.issn.1003-3246.2025.05.003
2009-2024年唐山地区小震视应力时空变化特征
Temporal and spatial variation characteristics of apparent stress of small earthquakes in Tangshan area from 2009 to 2024
摘要
Abstract
Using the waveform data of small earthquakes recored by digital seismic network of the capital region,we calculated the apparent stress of 2.5≤ML≤2.9 earthquakes from January 2009 to December 2024 based on Brune model,analysised the temporal and spatial variation of apparent stress for earthquakes above MS 4.0 in Tangshan area.The results show that:in terms of temporal distribution,the apparent stress of small earthquakes showed a significant upward trend before the occurrence of the selected earthquakes,indicating that the study area was in a state of high stress level for a long time.Earthquakes often occur after the apparent stress turned from a high value to a decreasing phase.The seismic mode reflects that the state of the stress field in the hypocenter region and the earthquakes occurred at the area which has large apparent stress gradients.which correspond to the stress enhancement process near the epicenter.This spatial distribution characteristic has indicative significance for judging the occurrence location of future main shocks.关键词
唐山地区/视应力/时空变化Key words
Tangshan area/apparent stress/temporal and spatial variation引用本文复制引用
岳晓媛,武敏捷,胡乐银,马梁,崔博闻..2009-2024年唐山地区小震视应力时空变化特征[J].地震地磁观测与研究,2025,46(5):21-27,7.基金项目
北京市地震局面上科技项目"首都圈地区地震重新定位和中长期强震危险性分析(项目编号:BJMS-2025002) （项目编号:BJMS-2025002）
