open access

https://hdl.handle.net/2115/97465

Decoding multiple source signatures in coseismic ionospheric disturbances of the 2024 January Mw7.5 Noto-Peninsula earthquake, Central Japan

英語

MSTID

2024-08-15

Elsevier

Earth and Planetary Science Letters

640

118796

Vertical crustal movements associated with large earthquakes excite various kinds of atmospheric waves. They propagate upward and often disturb ionosphere. Here, I report a case for the 2024 January 1 Mw7.5 earthquake that occurred in the northern tip of the Noto Peninsula, Central Japan, using a dense network of multi-GNSS receivers. A rectangular-shaped positive anomaly of ionospheric total electron content emerged ~9 min after the mainshock. The initial sharp peak was composed of two acoustic wave pulses excited at the two ends of the fault spanning ~100 km. It was followed by a series of smaller-amplitude broad peaks, the largest of which was possibly excited by a slow fault rupture near the NE edge of the fault ~8 min after the mainshock. These sig-natures become large where the wavefronts overlap with those of medium-scale traveling ionospheric distur-bances, suggesting possible enhancement of the coseismic signals by downward displacements of high electron density regions in the ionosphere.

学術雑誌論文

Accepted Manuscript

Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International

©2024. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/

0012-821X

AA00631029