2020年新疆于田MS6.4地震前地磁谐波振幅比变化特征分析

doi:10.12196/j.issn.1000-3274.2021.02.015

Abstract

Abstract: Taking the M_S6.4 Yutian earthquake on June 26, 2020 as an example, the method of harmonic wave amplitude ratio is used to analyze the geomagnetic anomalies on the basis of the second-value data derived from Xinjiang Qiemo and Xizang Shiquanhe geomagnetic stations, 370 km and 360 km away from the epicenter. The results show that before the June 26, 2020 M_S6.4 earthquake in Yutian of Xinjiang Uygur Autonomous Region, the harmonic wave amplitude ratio of Qiemo and Shiquanhe geomagnetic station presents obvious abnormality. There are four anomaly characteristics: ① The abnormal changes of the harmonic wave amplitude ratio Y_ZHx in the north-south and Y_ZHy in the east-west show the characteristics the form of “down-turning-recovery”, and the earthquake occurred at the recovery stage. ② About 2 years before the earthquake, the harmonic amplitude ratio of Qiemo and Shiquanhe station showed a phenomenon that the long and short period changes were not synchronized, or the NS and EW directions were not synchronized. ③ The turning and rising patterns in the abnormal change of the harmonic amplitude ratio of Qiemo station Y_ZHx (NS) and Shiquanhe station Y_ZHy (EW) have a migration phenomenon from a longer period to a shorter period. ④ The harmonic amplitude of Shiquanhe station is earlier than that of the trend anomaly at the start time of the Qimo station, with an average duration of about 2 years, and the maximum anomaly amplitude reaches 0.04. ⑤ The anomalies of the Shiquanhe station YZHx (NS) and Shiquanhe station Y_ZHy (EW) are more significant than the corresponding other components, which may be related to the location of the epicenter and the station. ⑥ The pre-earthquake Hetian field (about 265 km from the epicenter) also showed abnormal changes in the dominant azimuth (α) of rock mass fractures. It can be seen that the anomalous response of multiple geophysical detection parameters before the earthquake showed the coupling of multiple geophysical variables, which increased the anomalies reliability.

Key words: the 2020 Yutian M_S6.4 earthquake, Geomagnetic anomaly, Harmonic wave amplitude ratio, Rate accmulation

CLC Number:

P315.7

AISA Yisimayili, FENG Zhi-sheng, CHEN Jie-hong, SONG Chun-yan, MAO Zhi-qiang, ZHAO Jia-qing. Anomalies of the Geomagnetic Harmonic Wave Amplitude Ratio before the 2020 Yutian M_S6.4 Earthquake, Xinjiang[J]. EARTHQUAKE, 2021, 41(2): 190-202.

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Anomalies of the Geomagnetic Harmonic Wave Amplitude Ratio before the 2020 Yutian M_S6.4 Earthquake, Xinjiang

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Anomalies of the Geomagnetic Harmonic Wave Amplitude Ratio before the 2020 Yutian MS6.4 Earthquake, Xinjiang

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Anomalies of the Geomagnetic Harmonic Wave Amplitude Ratio before the 2020 Yutian M_S6.4 Earthquake, Xinjiang