广西北流-广东化州5.2级地震前华南地区连续重力扰动信号分析  

Signal Analysis of Continuous Gravity Disturbance in South China before the Beiliu-Huazhou MS 5.2 Earthquake in the Junction of Guangxi and Guangdong

作　　者：秦双龙[1] 关玉梅[1] 洪旭瑜[1] 杨锦玲[1] QIN Shuanglong;GUAN Yumei;HONG Xuyu;YANG Jinling(Fujian Earthquake Agency,Fuzhou 350003,China)

机构地区：[1]福建省地震局,福州350003

出　　处：《华南地震》2020年第2期37-42,共6页South China Journal of Seismology

基　　金：中国地震局监测预报司2020年震情跟踪项目(2020010107);福建省地震局科研专项(G201905)联合资助。

摘　　要：利用华南地区的多个连续重力台站gPhone相对重力仪秒采样原始数据,对记录到2019年10月12日广西北流-广东化州5.2级地震前后共7 d的重力秒采样数据进行预处理,提取高频扰动信号,应用短时傅里叶变换时频分析方法分析震前异常信号的频率特征,结合地震前后的台风活动变化,分析认为该扰动异常为2019年19号台风“海贝思”活动引起,非地震前兆异常。Based on the original second-sampling data of the gPhone relative gravimeter at several continuous gravity stations in south China,the paper preprocessed the gravity second-sampling data of seven days before and after the Beiliu-Huazhou MS5.2 earthquake in the junction of Guangxi and Guangdong on October 12^th,2019,extracted high frequency disturbance signals,analyzed the frequency characteristics of the anomalous signals before and after the earthquake by using the short-time Fourier transform method,and combined the changes in typhoon activity before and after the earthquake.It is believed that the disturbance anomaly is caused by the activity of typhoon Haibeisi in 2019 which is not a precursory anomaly.

关 键 词：华南地区 相对重力仪 高频信号 非地震前兆异常 

分 类 号：P315.7[天文地球—地震学]