2019年长宁6.0级与夏河5.7级地震前的地磁日变化异常

doi:10.12196/j.issn.1000-3274.2021.03.015

Abstract

Abstract: In this paper, we use three analysis methods of geomagnetic diurnal-variation anomaly, the geomagnetic low-value displacement, the geomagnetic load-unload response ratio and the geomagnetic daily ratio, to analyze the geomagnetic precursor anomalies before Changning M6.0 Earthquake on June 17, 2019 and Xiahe M5.7 Earthquake on October 28, 2019. We found that the results of all of the three methods had abnormal phenomena before Changning M6.0 and Xiahe M5.7 earthquakes, and both earthquakes occurred at the joint region of anomalies. The result shows that the superposition method of prediction of geomagnetic load-unload response ratio and geomagnetic daily ratio anomlies, as well as geomagnetic low-value displacement, can effectively improve the accuracy of epicenter prediction.

Key words: Geomagnetic diurnal variation, Geomagnetic low-point displacement, Geomagnetic load-unload response ratio, Geomagnetic daily ratio, 2019 Changning M6.0 earthquake, 2019 Xiahe M5.7 earthquake

CLC Number:

P315.7

NI Xiao-yin, HUANG Song, JIANG Chu-feng. Geomagnetic Diurnal Variation Anomalies Before 2019 Changning M6.0 Earthquake and Xiahe M5.7 Earthquake[J]. EARTHQUAKE, 2021, 41(3): 202-218.

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Geomagnetic Diurnal Variation Anomalies Before 2019 Changning M6.0 Earthquake and Xiahe M5.7 Earthquake

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