Geomagnetic Disturbances and Pulse Amplitude Anomalies Preceding M > 6 Earthquakes from 2021 to 2022 in Sichuan-Yunnan, China

Author:

Li Xia12,Qu Rui13ORCID,Ji Yingfeng13ORCID,Feng Lili2,Zhu Weiling13ORCID,Zhu Ye13ORCID,Liao Xiaofeng4,He Manqiu5,Feng Zhisheng6,Fan Wenjie7,He Chang4,Wang Weiming4,Faheem Haris13

Affiliation:

1. State Key Laboratory of the Tibetan Plateau Earth System, Environment and Resources (TPESER), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China

2. Qinghai Earthquake Administration, Xining 810001, China

3. University of the Chinese Academy of Sciences, Beijing 100049, China

4. Sichuan Earthquake Administration, Chengdu 610041, China

5. Chongqing Earthquake Administration, Chongqing 401147, China

6. Jiangsu Earthquake Agency, Nanjing 400071, China

7. Yunnan Earthquake Agency, Kunming 650244, China

Abstract

Compelling evidence has shown that geomagnetic disturbances in vertical intensity polarization before great earthquakes are promising precursors across diverse rupture conditions. However, the geomagnetic vertical intensity polarization method uses the spectrum of smooth signals, and the anomalous waveforms of seismic electromagnetic radiation, which are basically nonstationary, have not been adequately considered. By combining pulse amplitude analysis and an experimental study of the cumulative frequency of anomalies, we found that the pulse amplitudes before the 2022 Luding M6.8 earthquake show characteristics of multiple synchronous anomalies, with the highest (or higher) values occurring during the analyzed period. Similar synchronous anomalies were observed before the 2021 Yangbi M6.4 earthquake, the 2022 Lushan M6.1 earthquake and the 2022 Malcolm M6.0 earthquake, and these anomalies indicate migration from the periphery toward the epicenters over time. The synchronous changes are in line with the recognition of previous geomagnetic anomalies with characteristics of high values before an earthquake and gradual recovery after the earthquake. Our study suggests that the pulse amplitude is effective for extracting anomalies in geomagnetic vertical intensity polarization, especially in the presence of nonstationary signals when utilizing observations from multiple station arrays. Our findings highlight the importance of incorporating pulse amplitude analysis into earthquake prediction research on geomagnetic disturbances.

Funder

the CAS Pioneer Hundred Talents Program

Publisher

MDPI AG

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