[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:
2017-07-20
- 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:
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Last Update:
2017-07-20