青海地区地震磁扰动异常特征研究  

Characteristics of Magnetic Disturbance Associated with Earthquakes in Qinghai Area

作　　者：李霞[1,2] 冯丽丽 赵玉红[1,2] 刘磊 苟智栋[1] LI Xia;FENG Lili;ZHAO Yuhong;LIU Lei;GOU Zhidong(Qinghai Earthquake Agency, Xining 810001, Qinghai, China;Golmud Geodynamics Field Observation and Research Station of Qinghai-Tibet Plateau, China Earthquake Administration, Golmud 816001, Qinghai, China)

机构地区：[1]青海省地震局,青海西宁810001 [2]中国地震局青海格尔木青藏高原内部地球动力学野外科学观测研究站,青海格尔木816001

出　　处：《地震工程学报》2021年第1期99-104,112,共7页China Earthquake Engineering Journal

基　　金：中国地震局科技星火计划(XH21048Y);中国地震局震情跟踪定向工作任务(2021010413);青海省地震局格尔木青藏高原内部地球动力学野外科学观测研究站专项课题。

摘　　要：以青海地区8个测点磁通门秒采样观测数据为研究对象,利用地磁垂直强度极化法结合该区域中强地震背景进行分析。基于极化背景场变化特征提取震磁异常在研究区实际应用中取得以下认识:多台站同步极化高值异常对于2个月以内青海地区5级左右及以上地震有一定映震能力,且异常具有一定信度;测点密度均匀分布情况下,震中位置基本位于极化高值区域。Based on the second sampling observation data from fluxgate instruments at eight stations in Qinghai area,the geomagnetic vertical intensity polarization method,which is popular at present and with clear physical mechanism,was used to extract seismic magnetic anomalies based on the variation characteristics of polarization background field.The study results showed that It was shown that the high value anomalies of synchronous polarization at multiple stations has a certain ability to reflect MS≥5.0 earthquakes in Qinghai area within 2 months,and the epicenter is basically located in the region of high polarization value if the observation stations are evenly distributed.

关 键 词：地震磁扰动 地磁垂直强度极化法 青海地区 震例分析 

分 类 号：P318.5[天文地球—固体地球物理学]