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Static Coseismic Geomagnetic Changes Associated with the 2017 MW 6.5 Jiuzhaigou Earthquake

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Abstract

Although coseismic geomagnetic signals accompanying seismic waves have been observed previously, static coseismic changes in the geomagnetic field throughout China have hardly been elucidated. The static coseismic geomagnetic changes associated with the 2017 MW 6.5 Jiuzhaigou earthquake were investigated to evaluate the monitoring ability of geomagnetic stations in China. Precise geomagnetic field measurement data were obtained from the Songpan (SPA) geomagnetic station located 65 km from the epicenter. The static coseismic variation was below the background noise level. Piezomagnetic models were constructed from two non-uniform slip models, illuminating the possible geomagnetic changes caused by static stress changes due to fault slip. The piezomagnetic anomalies around the fault segment were 0.2 and 0.4 nT with a uniform rock magnetization of 1 A/m. The piezomagnetic anomaly at SPA was insignificant, indicating that no observable static geomagnetic signals were detected by the stations during the Jiuzhaigou earthquake. Given the higher rock magnetization of 2–3 A/m, the near-field piezomagnetic anomalies would tend to exceed 1 nT. Consequently, there would have chance to observe considerable piezomagnetic signals in the localized area of the fault segment.

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ACKNOWLEDGMENTS

The geomagnetic field data of SPA and TSY were supported by the Geomagnetic Network of China. Figures were drawn using the Generic Mapping Tools (GMT) software. The coseismic stresses were calculated using the PSGRN/PSCMP program developed by Prof. Rongjiang Wang. The Kp indices were obtained from the WDC (http://wdc.kugi.kyoto-u.ac.jp/kp/index.html).

Funding

This study was supported by the National Natural Science Foundation of China (grant no. 41 804 091).

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Authors and Affiliations

  1. The First Monitoring and Application Center, China Earthquake Administration, 300180, Tianjin, China

    Chengke Song

  2. Gansu Earthquake Agency, 730000, Lanzhou, Gansu, China

    Wansheng Yan

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  1. Chengke Song
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Correspondence to Chengke Song or Wansheng Yan.

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Chengke Song, Wansheng Yan Static Coseismic Geomagnetic Changes Associated with the 2017 MW 6.5 Jiuzhaigou Earthquake. Geomagn. Aeron. 62, 324–331 (2022). https://doi.org/10.1134/S0016793222030173

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