华南地震

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7d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 12th,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.

引言
1 资料选取
2 重力数据分析与结果
3 结论与讨论

图1 广西北流—广东化州5.2地震及华南地区重力台站分布图<br/>Fig.1 The distribution map of Beiliu-Huazhou MS5.2 earthquake in the junction of Guangxi and Guangdong and gravity stations in south China

图1 广西北流—广东化州5.2地震及华南地区重力台站分布图
Fig.1 The distribution map of Beiliu-Huazhou MS5.2 earthquake in the junction of Guangxi and Guangdong and gravity stations in south China

图2 华南地区10个台站重力原始数据时序图<br/>Fig.2 Time series of gravity data of 10 stations in south China

图2 华南地区10个台站重力原始数据时序图
Fig.2 Time series of gravity data of 10 stations in south China

图3 华南地区连续重力在2019年10月12日广西北流—广东化州5.2地震前滤波分析<br/>Fig.3 Filtering analysis of continuous gravity in south China before Beiliu-Huazhou MS5.2 earthquake on October 12th,2019

图3 华南地区连续重力在2019年10月12日广西北流—广东化州5.2地震前滤波分析
Fig.3 Filtering analysis of continuous gravity in south China before Beiliu-Huazhou MS5.2 earthquake on October 12th,2019

图4 广西北流—广东化州5.2级地震前华南地区连续重力台站的扰动时频<br/>Fig.4 Time-frequency diagram of continuous gravity stations in south China before the Beiliu-Huazhou MS5.2 earthquake

图4 广西北流—广东化州5.2级地震前华南地区连续重力台站的扰动时频
Fig.4 Time-frequency diagram of continuous gravity stations in south China before the Beiliu-Huazhou MS5.2 earthquake

图5 台风“海贝思”路径图<br/>Fig.5 Track map of typhoon Hagibis

图5 台风“海贝思”路径图
Fig.5 Track map of typhoon Hagibis

图6 台风“海贝思”中心距离重力台距离<br/>Fig.6 Distance between the center of typhoon Hagibisand and gravity stations

图6 台风“海贝思”中心距离重力台距离
Fig.6 Distance between the center of typhoon Hagibisand and gravity stations

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备注

引言

1 资料选取

2 重力数据分析与结果

3 结论与讨论

期刊信息