应力降与海南地震活动关系研究

Study on the relationship between stress drop and earthquake activity in Hainan

收集海南及周边区域2011—2018年的86次M>2地震。利用Brune圆盘模型计算得出应力降,对应力降结果处理后并不能发现与震级的直接关系。选取4个震级较大的地震,对比地震发生前后的应力降值后发现,应力降事件发生后,其后将有可能发生更大的地震,以达到调整区域应力状态的目的。通过空间等值线图发现北部湾地区近年来积累的能量更高,背景应力场更强。

Eighty-six earthquakes with magnitude greater than 2 were collected from 2011 to 2018 in Hainan and surrounding areas.Using the Brune disk model,the stress drop is calculated,and the direct relationship between the magnitude and the magnitude cannot be found after the stress drop result is processed.Four earthquakes with large magnitudes were selected.Through comparison of the stress drop values before and after the earthquake,it is found that after the stress drop event a larger earthquake may occur later to adjust the regional stress state.Based on the spatial contour map,it is found that the Beibu Gulf area has accumulated more energy in recent years and its background stress field is getting stronger.