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高邮-宝应4.9级地震地磁谐波振幅比异常特征初步分析
蒋延林,袁桂平,李鸿宇,唐廷梅,赵卫红
作者单位
蒋延林 高邮地震台, 江苏省高邮市南郊地震台路2号 225601 
袁桂平 江苏省地震局, 南京 210014 
李鸿宇 江苏省地震局, 南京 210014 
唐廷梅 山东省地震局, 济南 250014 
赵卫红 高邮地震台, 江苏省高邮市南郊地震台路2号 225601 
摘要:
针对高邮-宝应4.9级地震发生前后附近地区未发生其它中等以上地震、地震事件孤立及周边地磁台站分布较密有利于研究地震地磁异常时空特征的特点,较为系统地分析总结了该地震发生前后地磁谐波振幅比的变化特征,研究结果进一步验证了目前对地磁谐波振幅比异常特征的认识,即地磁谐波振幅比异常特征表现出与地电阻率类似的下降-转折-恢复上升的异常变化过程,地震一般发生在异常转折或恢复上升过程中,距震中较近的台站会出现不同步现象——南北向与东西向的不同步以及长短周期的不同步。
关键词:  地磁  异常  振幅比  高邮-宝应4.9级地震
DOI:
分类号:
基金项目:
The Preliminary Analysis of the Characteristics of Geomagnetic Harmonic Wave Amplitude Ratios before the Gaoyou-Baoying MS4.9 Earthquake
Jiang Yanlin,Yuan Guiping,Li Hongyu,Tang Tingmei,Zhao Weihong
Abstract:
In this paper, the Gaoyou-Baoying MS4.9 earthquake was analyzed by the geomagnetic harmonic wave amplitude ratios method. The earthquake was an isolated seismic event, before and after which there were no other earthquakes occurred in this region. The dense distribution of geomagnetic observataries provided an advantage condition for the analysis of characteristics of the geomagnetic harmonic amplitude ratios. The analysis results verify the former knowledge of anomaly characteristics of the geomagnetic harmonic amplitude ratio, that is, the anomalous characteristics of the earthquake mostly appeared during the decline-turning-recovery rising process. The results also show that the change of the anomalies was asynchronous at the observatories close to the epicenter, namely, the anomalous characteristics were different between the H and the D components, as well as between the long and short periods.
Key words:  Geomagnetic  Anomaly  Harmonic wave  Gaoyou-Baoying MS4.9 earthquake