2022年1月8日青海门源6.9级地震前地球物理观测异常分析  

ANOMALY ANALYSIS OF GEOPHYSICAL OBSERVATIONS BEFORE THE MENYUAN M_(s)6.9 EARTHQUAKE IN QINGHAI ON JANUARY 8,2022

作　　者：汪发耀[1] 杨积礼[1] 李滔[1] 苏宁[1] 周海生[1] WANG Fayao;YANG Jili;LI Tao;SU Ning;ZHOU Haisheng(Qinghai Earthquake Agency,Xining 810001,China)

机构地区：[1]青海省地震局,青海西宁810001

出　　处：《高原地震》2022年第1期15-20,共6页Plateau Earthquake Research

摘　　要：对青海省门源地震台静水位、石英水平摆倾斜和钻孔应变等地球物理观测资料的阶段性变化特征分析,以及对2022年1月8日青海门源6.9级地震前的短临异常变化进行了研究。结果表明,门源地震台静水位、水平摆倾斜和钻孔应变观测资料在此次地震中均出现了明显的短临异常。其中,静水位出现加速上升和下降异常变化,并在持续下降变化中发生了青海门源6.9级地震;石英水平摆倾斜仪存在北倾的加速或转折异常变化;钻孔应变四分量在地震前监测到强烈的挤压变化。In this paper,geophysical observation data such as static water level,quartz horizontal pendulum inclinometer and borehole strain at the Menyuan Seismic Station in Qinghai are used to analyze the phase change characteristics.The anomalous changes in a number of geophysical observations before the M_(s)6.9 Menyuan earthquake in Qinghai on January 8,2022 were studied.The results show that the observation data of static water level,horizontal pendulum tilt and borehole strain of Menyuan seismic station showed obvious short impending anomalies during this earthquake.Among them,the static water level showed abnormal changes of accelerating rise and falling.The Menyuan M_(s)6.9 earthquake occurred in the process of continuous drop of static water level Quartz horizontal pendulum inclinometer has been in tendency to accelerate or turn abnormal changes before the M_(s)6.9 Menyuan earthquake in Qinghai.Four-component borehole strain detected strong anomalous trend change in compression anomalies possibly associated with the event.

关 键 词：地球物理 监测异常 门源6.9级地震 异常变化 地震前兆 

分 类 号：P315.723[天文地球—地震学]