昆明地震监测中心站gPhone连续重力数据DF频段 信号异常变化特征与干扰分析  

Abnormal Variation Characteristics and Interference Analysis of DF Band Signal in gPhone Continuous Gravity Data at Kunming Earthquake Monitoring Centre Station

作　　者：黄雅 韦进[3] 申重阳[3] 段毅[1,2] 方伟 HUANG Ya;WEI Jin;SHEN Chongyang;DUAN Yi;FANG Wei(Yunnan Earthquake Agency,Kunming 650224,Yunnan,China;Dali Center of China Earthquake Science Experiment Site,Dali 671000,Yunnan,China;Institute of Seismology,China Earthquake Administration,Wuhan 430071,Hubei,China)

机构地区：[1]云南省地震局,云南昆明650224 [2]中国地震科学实验场大理中心,云南大理671000 [3]中国地震局地震研究所,湖北武汉430071

出　　处：《地震研究》2025年第4期674-684,共11页Journal of Seismological Research

基　　金：中国地震局监测、预报、科研三结合项目(3JH-202401073);云南省重点研发项目社会发展专项(202203AC100003);中国地震局地震科技星火计划(XH23026C).

摘　　要：基于2015—2020年昆明地震监测中心站(以下简称“昆明站”)的gPhone连续重力观测数据,采用时频分析方法计算双频微震(DF)频段视垂直位移,利用全球地震背景噪声能量辐射模型(ASSM)正演昆明站DF频段信号,并结合台风和邻近重力站数据,对昆明站DF频段信号异常变化特征进行研究,探讨了昆明站周边地震活动与DF频段信号之间的关系。结果显示:①年变化趋势显示昆明站周边300 km范围内M S≥5.0地震易发生在台风频繁且DF频段视垂直位移较高的月份内,月变化趋势则显示地震易发生在视垂直位移由低转高的过程中。②2020年巧家M S5.0地震前DF频段信号的异常变化,并不是由巧家地震引起,而与印度洋台风有关。总结震前DF频段信号异常特征,有助于该地区中强地震预测研究。Based on gPhone continuous gravity data collected from Kunming Earthquake Monitoring Centre Station during 2015-2020,we adopted the time-frequency analysis method to calculate the apparent vertical displacement in the DF frequency band.We used the global seismic background noise energy radiation model(ASSM)to forward the DF frequency band signal at Kunming station.Referring to the data of the typhoon in the Indian Ocean,and the gravity data from the adjacent stations of Kunming station,we studied the abnormal characteristics of the DF frequency band signal at Kunming station,and explored the relationship between the earthquake activity around Kunming station and the DF frequency band signal.The results reveal that:①The annual variation trend indicates that M S≥5.0 earthquakes around Kunming station within 300 km are prone to occuring in months with frequent typhoons and high apparent vertical displacement in the DF frequency band,while the monthly variation trend shows that earthquakes are prone to occuring during the process of the apparent vertical displacement changing from low to high.②The abnormal change of DF band signal before the Qiaojia M S5.0 earthquake are not the precursor of the Qiaojia earthquake,but related to the typhoon from the Indian Ocean.It is helpful to predict moderate and strong earthquakes in the study area by summarizing the abnormal characteristics of DF band signal before the earthquake.

关 键 词：DF频段 视垂直位移 ASSM模型 gPhone重力仪 台风 地震活动 

分 类 号：P315.63[天文地球—地震学]