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<p>Magnetic field data from Swarm’s magnetometers were investigated during the 2025 M<sub>w</sub> 8.8 Kamchatka earthquake. The examination focuses on the spatiotemporal distribution of magnetic data with Flag 8, which indicates discrepancies between the scalar and vector magnetometers. Flag 8 was observed along Swarm satellite orbits near the epicenter prior to the earthquake, initially appearing approximately 16 days before the mainshock and persisting until 9 days after. The results indicate that the spatial distribution of Flag 8 exhibits high density and extensive coverage around the epicentral region, showing a close relationship with the earthquake. Further examination suggests that neither polar geomagnetic activity nor the South Atlantic Anomaly can adequately explain the observed pattern. This implies that the observed Flag 8 is more likely associated with the seismic activity in the Kamchatka Peninsula. This study highlights Flag 8 as a complementary tool for detecting pre-earthquake magnetic anomalous phenomenon and advancing earthquake precursor research.</p>

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Magnetic measurement discrepancies in the Ionosphere prior to the 2025 Kamchatka Mw 8.8 earthquake

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年4月7日

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  • Liwei Zhou,
  • Shenjia Zhang,
  • Yinqian Li,
  • Hong Liu,
  • Tianya Luo,
  • Dan Tao,
  • Yongxin Gao,
  • Longwei Chen,
  • Jun Hu,
  • Xuemin Zhang,
  • Chieh-Hung Chen

摘要

Magnetic field data from Swarm’s magnetometers were investigated during the 2025 Mw 8.8 Kamchatka earthquake. The examination focuses on the spatiotemporal distribution of magnetic data with Flag 8, which indicates discrepancies between the scalar and vector magnetometers. Flag 8 was observed along Swarm satellite orbits near the epicenter prior to the earthquake, initially appearing approximately 16 days before the mainshock and persisting until 9 days after. The results indicate that the spatial distribution of Flag 8 exhibits high density and extensive coverage around the epicentral region, showing a close relationship with the earthquake. Further examination suggests that neither polar geomagnetic activity nor the South Atlantic Anomaly can adequately explain the observed pattern. This implies that the observed Flag 8 is more likely associated with the seismic activity in the Kamchatka Peninsula. This study highlights Flag 8 as a complementary tool for detecting pre-earthquake magnetic anomalous phenomenon and advancing earthquake precursor research.