Slow Fault Slip Signatures in Coseismic Ionospheric Disturbances

DOI DOI 機関リポジトリ (HANDLE) Web Site Web Site ほか1件をすべて表示 一部だけ表示 被引用文献3件 参考文献32件 オープンアクセス

書誌事項

公開日
2022-12-28
資源種別
journal article
権利情報
  • Copyright 2022 American Geophysical Union.
DOI
  • 10.1029/2022gl101064
  • 10.1002/essoar.10512323.1
公開者
American Geophysical Union

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説明

Rise times of earthquake moment release influence the spectra of seismic waves. For example, slow fault movements in tsunami earthquakes excite larger tsunamis than expected from intensities of short-period seismic waves. Here we compare amplitudes of two different atmospheric waves, long-period internal gravity waves and short-period acoustic waves, excited by coseismic vertical crustal movements. We observe them as coseismic ionospheric disturbances by measuring ionospheric electrons using global navigation satellite systems. Four regular megathrust earthquakes Mw8.0–9.0 showed that the internal gravity waves become ten times stronger as the magnitude increases by one. We found that the 2010 Mentawai earthquake, a typical tsunami earthquake, excited internal gravity waves stronger than those expected by this empirical relationship.On the other hand, amplitudes of acoustic waves excited by tsunami earthquakes were normal. This suggests that slow fault ruptures excite long-period atmospheric waves efficiently, leaving a slow earthquake signature in ionospheric disturbances.

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