TITLE:
Geomagnetic Variations Associated with Strong Earthquakes in Yunnan Area
AUTHORS:
Xiuyi Yao, Zhisheng Feng, Yuntian Teng, Yunhui Wang, Qiuyue Zheng
KEYWORDS:
Earthquake Precursor, Geomagnetic Amplitude Ratio, Yunnan Area
JOURNAL NAME:
Open Journal of Earthquake Research,
Vol.6 No.4,
November
30,
2017
ABSTRACT: In order to find geomagnetic anomalies associated with Ms ≥ 6.0 strong
earthquakes in Yunnan area, geomagnetic harmonic wave amplitude ratios
with Z, H and D components in TCH, THJ, CHX and YOS stations were analyzed.
It was found that geomagnetic amplitude ratio of Yzhx experienced a
trend of decrease and increase before most of strong earthquakes. Moreover,
these variations in different periods were inconsistent and no similar changes
appeared for Yzhy, which may relate to fault-zone conductivity variation and
seismogenic structure.