2024年1月23日新疆乌什MS7.1地震前电磁多参量异常

doi:10.12196/j.issn.1000-3274.2025.01.005

Abstract

Abstract: On January 23, 2024, an M_S7.1 earthquake with a focal depth of 20 km occurred in Uqturpan County (78.63°E, 41.26°N), Xinjiang, China. In this paper, the multi electromagnetic anomalies, such as earth resistivity, geoelectric field, and geomagnetic field, within 500 km from the epicenter of the 2024 Uqturpan County M_S7.1 earthquake, are analyzed using morphological analysis, dominant azimuth, normalized change rate method, daily ratio of geomagnetic field, and vertical intensity polarization method. After excluding factors such as instrument operation, station observation environment, and space electromagnetic activity, it is considered that the annual change in earth resistivity occurred before the earthquake at Kalpin station within a range of about 70 km from the epicenter. The annual amplitude of the EW direction at the Kalpin earth resistivity station in 2023 was significantly less than the background, being the most prominent variation since 2014. The dominant azimuth angles of rock fissures in the long and short EW/NW geoelectric fields in Wenquan showed a decrease followed by an increase 8 months before the earthquake, and they shifted towards the direction of the Uqturpan County earthquake just before the event. The geomagnetic field exhibited abnormal changes in the vertical intensity polarization, the daily ratio of the vertical component, and the displacement of the geomagnetic low point 10 months, 57 days, 35 days, and 7 days before the earthquake, respectively. Additionally, the 2022—2023 mobile geomagnetic survey also showed anomalous variations in the region from Kalpin County to Akqi County. Finally, the temporal and spatial evolution characteristics of the multi-parameter electromagnetic anomalies during the 2024 Uqturpan M_S7.1 earthquake on January 23 are analyzed, and the causes of the precursors are discussed. These results can accumulate experiences and cases for earthquake prediction using the electromagnetic multi-parameter method in the future, and help to further optimize prediction indexes.

Key words: The 2024 Uqturpan M_S7.1 earthquake in Xinjiang, Electromagnetic anomaly, Earth resistivity, Earth electric field, Geomagnetic field

CLC Number:

P315.7

AISA·Yisimayili, ZHANG An-he, SONG Chun-yan, LIU Hai-yang, ZHAI Shi-long, FENG Li-li, NIU Zhong-hua, XIONG Pan, JIAO Li-guo, HE Man-qiu. Electromagnetic Multi-parameter Anomalies before the Uqturpan County M_S7.1 Earthquake in Xinjiang on January 23, 2024[J]. EARTHQUAKE, 2025, 45(1): 63-80.

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Electromagnetic Multi-parameter Anomalies before the Uqturpan County M_S7.1 Earthquake in Xinjiang on January 23, 2024

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Electromagnetic Multi-parameter Anomalies before the Uqturpan County MS7.1 Earthquake in Xinjiang on January 23, 2024

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Electromagnetic Multi-parameter Anomalies before the Uqturpan County M_S7.1 Earthquake in Xinjiang on January 23, 2024