[1]NI Xiaoyin,CHEN Ying.The Variation Characteristics of Short-Period Geomagnetic Harmonic Wave Amplitude Ratio before Strong Earthquakes[J].Journal of Seismological Research,2017,40(03):431-436.
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The Variation Characteristics of Short-Period Geomagnetic Harmonic Wave Amplitude Ratio before Strong Earthquakes
Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume:
40
Number of periods:
2017 03
Page number:
431-436
Column:
流动地磁专栏
Public date:
2017-07-23
- Title:
- The Variation Characteristics of Short-Period Geomagnetic Harmonic Wave Amplitude Ratio before Strong Earthquakes
- Keywords:
- geomagnetic field; harmonic wave amplitude ratio; the Minxian-Zhangxian M6.6 earthquake; the Lushan M7.0 earthquake
- CLC:
- P318
- DOI:
- -
- Abstract:
- This paper calculates the geomagnetic harmonic wave amplitude ratio with periods of 20～230 s by using the data of GM4 fluxgate magnetometer at the Chengdu station and Tianshui station.We find that the abnormal variations of geomagnetic harmonic wave amplitude ratio with periods of 20～230 s showed the characteristics of down-turning-recovery before earthquakes,which were same as the abnormal variations of geomagnetic harmonic wave amplitude ratio with periods of 10～60 min.At the Chengdu station,there was asynchronization between north-south direction and west-east direction,and also between long-period and short-period.However,the asynchronous phenomenon at the Tianshui station only existed between long-period and short-period.According to the anomaly characteristics,we infer that the Tianshui station was located in the high conductive body before the Minxian-Zhangxian M6.6 earthquake,and the Chengdu station located near the east border of the high conductive body before the Lushan M7.0 earthquake.
- References:
-
戴勇,高立新,张立丰.2016.甘—青地区地磁谐波振幅比分析[J].地震工程学报,38(1):12-18.
丁鉴海,卢振业,黄雪香.1994.地震地磁学[M].北京:地震出版社,131.
冯志生,居海华,李鸿宇,等.2009.地磁谐波振幅比异常特征的进一步研究及定性解释[J].华南地震,29(1):17-23.
冯志生,李鸿宇,张秀霞,等.2013.地磁谐波振幅比异常和强地震[J].华南地震,33(3):9-15.
冯志生,梅卫萍,张秀霞,等.2004.中强震前地磁谐波振幅比的趋势性变化特征初步研究[J].西北地震学报,26(1):50-56.
倪喆,陈双贵,袁洁浩,等.2014.芦山7.0 级地震前后岩石圈磁场异常变化研究[J].地震研究,37(1):61-65.
徐文耀,祁睽,王仕明.1978.甘肃省东部地区短周期地磁变化异常及其与地震的关系[J].地球物理学报,21(3):2l8-223.
曾小苹,林云芳.1995.地磁短周期变化异常对中国中强地震的响应[J].地震,15(1):29-36.
PARKINSON W D.1959.Directions of rapid geomagnetic fluctuations[J].Geophys J R Astr Soc,2(1):1-14.
RIDITAKE T,YOKUYAMA.1952.A Preliminary Study on the Anomalous Behavior of Geomagnetic Variations of Short Period in Japan and Its Relation to the Subterranean Structure[J],Bull Earthq Res Inst Univ.Tokyo,31(2):89-100.
YANAGIHARA K.1972.Secular Variations of the electrical conductivity anomaly in the central part of Japan[J].Mem Kakioka Mag Obs,15(1):1-11.
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Last Update:
2017-07-20