中强地震前地磁极化异常特征及其与后续地震的关系

doi:10.12196/j.issn.1000-3274.2021.02.013

EARTHQUAKE ›› 2021, Vol. 41 ›› Issue (2): 170-179.doi: 10.12196/j.issn.1000-3274.2021.02.013

Characteristics of Geomagnetic Vertical Intensity Polarization Anomalies before Moderate Strong Earthquakes and Their Relationship with Subsequent Earthquakes

FAN Wen-jie¹, FENG Li-li², LI Xia², GUAN Yi-liang³, HE Chang⁴, LIAO Xiao-feng⁴, HE Man-qiu⁵, LIU Su-zhen⁶, YUAN Wen-xiu⁷, AISA Yisimayili⁸

1. Yunnan Earthquake Agency, Kunming 650224, China;
2. Qinghai Earthquake Agency, Xining 810001, China;
3. Shandong Earthquake Agency, Jinan 250014, China;
4. Sichuan Earthquake Agency, Chengdu 610041, China;
5. Chongqing Earthquake Agency, Chongqing 401147, China;
6. Shanxi Earthquake Agency, Taiyuan 310013, China;
7. Zhejiang Earthquake Agency, Hangzhou 830011, China;
8. Earthquake Agency of Xinjiang Uygur Autonomous Region, Urumqi 030021, China

Received:2021-01-03 Revised:2021-02-18 Online:2021-04-30 Published:2021-08-06

Abstract

Abstract: Based on the 1-second sampling data from the national geomagnetic network center, using the method of geomagnetic vertical intensity polarization, we calculated the geomagnetic polarization values of stations in China from January 1, 2019 to July 31, 2020. The polarization anomalies in the western China (west of 110°E) in 2019 are analyzed, and the characteristics of geomagnetic polarization anomalies before moderate earthquakes such as Yutian M_S6.4 earthquake and its relationship with earthquakes are studied. The results show that, ① the geomagnetic polarization anomalies have the characteristics of spatial grouping, that is, the polarization anomalies can occur simultaneously in multiple regions. Geomagnetic polarization anomalies are generally considered to be electromagnetic radiation caused by fault creep or rock rupture in the source area before the earthquake. This means that fault creep or rock rupture may occur in multiple areas at the same time before the earthquake. It seems to indicate that there is a force source of that causes fault creep or rock rupture in multiple areas at the same time. ② Earthquakes have group characteristics after geomagnetic polarization anomalies, that is, multiple earthquakes may occur after polarization anomalies in one region. And this phenomenon is of great reference significance for routine consultation and analysis. The subsequent earthquakes may occur after the expected earthquake. ③ Some previous studies demonstrated that geomagnetic polarization anomalies generally appeared 2~3 months before the earthquakes, but we found that earthquakes would still occur in the abnormal area 10 months after the polarization anomalies. It indicates that the electromagnetic radiation anomalies may not only be short-term anomalies, but may also have mid-term indication, that is, fault creeping or rock rupture may have started nearly 1 year before the earthquakes. This discovery poses a challenge to many current studies of similar electromagnetic anomalies that only to be connected with earthquakes within 3 months.

Key words: Earthquake anomalies, Electromagnetic waves, Geomagnetic polarization, Fault creep, Rock fracture

CLC Number:

P315.7

FAN Wen-jie, FENG Li-li, LI Xia, GUAN Yi-liang, HE Chang, LIAO Xiao-feng, HE Man-qiu, LIU Su-zhen, YUAN Wen-xiu, AISA Yisimayili. Characteristics of Geomagnetic Vertical Intensity Polarization Anomalies before Moderate Strong Earthquakes and Their Relationship with Subsequent Earthquakes[J]. EARTHQUAKE, 2021, 41(2): 170-179.

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Characteristics of Geomagnetic Vertical Intensity Polarization Anomalies before Moderate Strong Earthquakes and Their Relationship with Subsequent Earthquakes

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