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Slow Fault Slip Signatures in Coseismic Ionospheric Disturbances
| Title: | Slow Fault Slip Signatures in Coseismic Ionospheric Disturbances |
| Authors: | Heki, Kosuke Browse this author →KAKEN DB | | Bagiya, Mala S. Browse this author | | Takasaka, Yuki Browse this author |
| Issue Date: | 28-Dec-2022 |
| Publisher: | American Geophysical Union |
| Journal Title: | Geophysical Research Letters |
| Volume: | 49 |
| Issue: | 24 |
| Start Page: | e2022GL101064 |
| Publisher DOI: | 10.1029/2022GL101064 |
| Abstract: | 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 Mw 8.0–9.0 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. |
| Rights: | Copyright 2022 American Geophysical Union. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/90355 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 日置 幸介
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