2018-05-28松原MS5.7地震地电场变化特征研究

通过研究东北地区地电场观测资料，结合2018-05-28吉林松原M_S5.7地震，分别对震中周边自然电场E_SP和大地电场E_T地震前后背景、临震、震后响应时序变化进行对比分析，并应用岩体裂隙水电荷移动渗流模型计算研究区电荷移动的优势方位。结果表明，震前绥化、林甸、肇东、望奎自然电场E_SP出现明显的小幅度突跳或大幅度跃变，电荷移动的优势方位震前3个月内出现45°挤压或拉张异常特征。

Study on Variation Characteristics of Natural Electric Field in Songyuan MS5.7 Earthquake on May 28, 2018

We study the observational data of the geoelectric field in northeast China and combined with the Songyuan M_S5.7 earthquake on May 28, 2018, in Jilin. At the same time, we comparatively analyze the background, imminent and post-earthquake response time series changes of the natural electric fieldE_SP and the telluric fieldE_T around the epicenter. In the study area, we calculate the dominant direction of charge movement by applying the charge movement seepage model of rock fissure water. The results show that the natural electric fieldE_SP in Suihua, Lindian, Zhaodong, and Wangkui show obvious small-amplitude sudden jumps or large-scale jumps before the earthquake, and 45° extrusion or tension anomalies feature occurred in the dominant direction of charge movement within 3 months before the earthquake.