地震地磁观测与研究2026，Vol.47Issue(3)：22-27,6.DOI:10.3969/j.issn.1003-3246.2026.03.003
四川大岗山水库蓄水前后震源参数特征分析
Analysis of seismic source parameters before and after impoundment of the Dagangshan Reservoir
摘要
Abstract
This study used waveform records from 580 ML≥1.7 earthquake events in the Dagangshan Reservoir area from February 2014 to February 2017,calculated source parameters including seismic moment,stress drop,apparent stress and corner frequency,and compared their characteristics before and after impoundment.The main observations are as follows:① Seismic activity of the Dagangshan Reservoir is closely related to reservoir impoundment.Significant differences in source parameters are observed before and after impoundment,with an increase in seismic activity frequency after impoundment.② For earthquakes with relatively large magnitudes,the apparent stress is linearly related to the stress drop and both parameters increase with magnitude.For smaller earthquakes,stress drop still shows a certain magnitude dependence.③ Apparent stress increases with seismic moment,suggesting a possible relationship with changes in the source rupture process associated with reservoir impoundment.④ Corner frequency tends to decrease with increasing magnitude,with a more obvious trend after impoundment.This may reflect an increase in the stress level in the reservoir area after impoundment.⑤ The spatio-temporal distribution of apparent stress shows that the level of apparent stress after impoundment is higher than that before impoundment.Moreover,the regional seismicity after impoundment may be dominated by reservoir-induced earthquakes.关键词
震源参数/水库诱发地震/大岗山水库Key words
seismic source parameters/reservoir-induced seismicity/Dagangshan Reservoir引用本文复制引用
李川,王宇玺,扎西平措,江永曲吉,陈正位..四川大岗山水库蓄水前后震源参数特征分析[J].地震地磁观测与研究,2026,47(3):22-27,6.基金项目
中国地震局地震预测研究所基本科研业务费(项目编号:CEAIEF20260601) （项目编号:CEAIEF20260601）
