华南地区地磁加卸载响应比异常指标
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摘要
计算了2008—2016年华南地区的地磁加卸载响应比,分析研究了华南地区加卸载响应比异常特征和震例,提出了适用于华南地区的异常指标。研究结果表明:华南地区4级以上震例均发生在加卸载响应比异常出现后半年内,震中位于异常日加卸载响应比阈值等值线附近。分析推测加卸载响应比异常的形成机理与低点位移异常类似,都是由地下感应电流在电流两侧的反相位感应磁场引起的。
This paper calculates the geomagnetic load-unload response ratio by using the data at geomagnetic stations in south China, analyzes the characteristics of anomalies and the earthquake cases, and finally presents the index system fitting to the analytic prediction in south China. The result shows that all earthquake cases with M≥4 in south China occurred within 6 months after the anomalies appeared, and most of these earthquakes were located near the threshold line of geomagnetic load-unloading response ratio at abnormal days. The paperspeculated that the geomagnetic load-unload response ratio anomalies were caused by the induced current underground which caused opposed-phase induced magnetic field on opposite sides of the current, and this formation mechanism is similar with the geomagnetic low point displacement anomaly.
This paper calculates the geomagnetic load-unload response ratio by using the data at geomagnetic stations in south China, analyzes the characteristics of anomalies and the earthquake cases, and finally presents the index system fitting to the analytic prediction in south China. The result shows that all earthquake cases with M≥4 in south China occurred within 6 months after the anomalies appeared, and most of these earthquakes were located near the threshold line of geomagnetic load-unloading response ratio at abnormal days. The paperspeculated that the geomagnetic load-unload response ratio anomalies were caused by the induced current underground which caused opposed-phase induced magnetic field on opposite sides of the current, and this formation mechanism is similar with the geomagnetic low point displacement anomaly.
引文
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[3]王亶文.加卸载响应比理论在以磁报震中的应用探索[J].地震地磁观测与研究,1995,15(03):26-30.
[4]曾小苹,续春荣,赵明,等.地球磁场对太阳风的加卸载响应与地震[J].地震地磁观测与研究,1996,17(01):49-53.
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[6]续春荣,林云芳,吕桂芳,等.地球磁场对太阳风的加卸载响应与川滇中强地震[J].中国地震,1998,14(2):92-98.
[7]戴苗,冯志生,刘坚,等.南北地震带地磁加卸载响应比应用研究[J].地质科技情报,2017,36(04):222-227+249.
[8]冯志生,李琪,李鸿宇,等.地磁低点位移线两侧异常变化的反相位现象及其解释[J].中国地震,2009,25(2):206-213.
[9]丁鉴海,余素荣,肖武军.地磁“低点位移”现象与昆仑山口西8.1级地震[J].西北地震学报,2003,25(1):16-21.
[10]倪晓寅,胡淑芳,陈莹等.地磁垂直分量日变幅逐日比在南北带的应用[J].大地测量与地球动力学,2017,37(增刊IV):43-48.
[11]李鸿宇,袁桂平,王俊菲,等. 2013年7月22日甘肃岷县—漳县6.6级地震地磁总场F空间相关异常分析[J].地震工程学报,2017,39(3):0551-0556.
[2]宋治平,尹祥础,陈学忠.加卸载响应比理论及其在地震预报中的应用进展[J].地震,1995,15(增刊):79-87.
[3]王亶文.加卸载响应比理论在以磁报震中的应用探索[J].地震地磁观测与研究,1995,15(03):26-30.
[4]曾小苹,续春荣,赵明,等.地球磁场对太阳风的加卸载响应与地震[J].地震地磁观测与研究,1996,17(01):49-53.
[5]冯志生,林云芳,王建宇,等.江苏地磁加卸载响应比的异常标志体系[J].地震,2000,20(2):61-68.
[6]续春荣,林云芳,吕桂芳,等.地球磁场对太阳风的加卸载响应与川滇中强地震[J].中国地震,1998,14(2):92-98.
[7]戴苗,冯志生,刘坚,等.南北地震带地磁加卸载响应比应用研究[J].地质科技情报,2017,36(04):222-227+249.
[8]冯志生,李琪,李鸿宇,等.地磁低点位移线两侧异常变化的反相位现象及其解释[J].中国地震,2009,25(2):206-213.
[9]丁鉴海,余素荣,肖武军.地磁“低点位移”现象与昆仑山口西8.1级地震[J].西北地震学报,2003,25(1):16-21.
[10]倪晓寅,胡淑芳,陈莹等.地磁垂直分量日变幅逐日比在南北带的应用[J].大地测量与地球动力学,2017,37(增刊IV):43-48.
[11]李鸿宇,袁桂平,王俊菲,等. 2013年7月22日甘肃岷县—漳县6.6级地震地磁总场F空间相关异常分析[J].地震工程学报,2017,39(3):0551-0556.