2017年8月8日九寨沟7.0级地震前地磁垂直强度极化短期异常特征分析

doi:10.12196/j.issn.1000-3274.2021.04.005

Abstract

Abstract: The vertical intensity polarization is calculated by using the geomagnetic data of Sichuan and its adjacent areas before and after the Jiuzhaigou M_S7.0 earthquake on August 8, 2017. The geomagnetic polarization results at 5~100 s frequency band before the earthquake have the following obvious abnormal characteristics: ① In March 2017, the geomagnetic stations near the epicenter synchronously showed polarization over threshold anomalies, which are short-term anomalies in time. ② The occurrence time of the maximum amplitude was consistent for abnormal stations. ③ The Jiuzhaigou earthquake occurred near the anomaly threshold line, which has a certain indication significance for the prediction location of this method. ④ Compared the Dst index in the abnormal period, it is considered that the synchronous anomalies over threshold were not caused by the space current system. ⑤ On March 18, there were more stations with polarization anomalies to cover a larger area, and the anomalies mainly concentrating in Northwest China may illustrate the stress effects in this region.

Key words: Jiuzhaigou earthquake, Geomagnetism, Frequency band, Vertical intensity polarization method, Anomaly characteristics

CLC Number:

P315.7

LIAO Xiao-feng, FAN Wen-jie, QIU Gui-lan, LI Xue-hao, YANG Peng. Analysis on Short-Term Characteristics of Geomagnetic Vertical Intensity Polarization Anomaly Before Jiuzhaigou 7.0 Earthquake on August 8, 2017[J]. EARTHQUAKE, 2021, 41(4): 68-77.

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Analysis on Short-Term Characteristics of Geomagnetic Vertical Intensity Polarization Anomaly Before Jiuzhaigou 7.0 Earthquake on August 8, 2017

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