2024-03-29T01:10:10Z
https://nagoya.repo.nii.ac.jp/oai
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2023-01-16T05:07:33Z
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Estimating plume heights of explosive eruptions using high-frequency seismic amplitudes
Mori, Azusa
Kumagai, Hiroyuki
open access
This article has been accepted for publication in [Geophysical Journal International] ©: [2019] [Authors] Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Explosive volcanism
Remote sensing of volcanoes
Volcano monitoring
Volcano seismology
Seismic signals during explosive eruptions have been correlated to eruption size or eruption volume flux for individual eruptive episodes. However, the universality of these correlations has yet to be confirmed. We quantified the sources of high-frequency seismic signals associated with sub-Plinian and Vulcanian eruptions at Kirishima (Japan), Tungurahua (Ecuador) and other volcanoes in Japan using a simple approach based on highly scattered seismic waveform characteristics. We found that eruption plume heights scale to seismic source amplitudes and are described by two relations depending on the value of source amplitudes: power-law and exponential relations for plume height >6 km and <6 km, respectively. Though conceptually similar, our scaling relations differ from the previously proposed relation based on reduced displacement. By comparing seismic and geodetic data during sub-Plinian eruptions at Kirishima, we found that the source amplitude is proportional to eruption volume flux. Combining these relations, we show that our scaling relation for Plinian eruptions is consistent with predictions from plume dynamics models. We present a source model to explain the proportionality between the source amplitude and eruption volume flux assuming a vertical crack or a cylindrical conduit as the source. The source amplitude can be estimated in seconds without any complicated data processing, whereas eruption plumes take minutes to reach their maximum heights. Our results suggest that high-frequency seismic source amplitudes are useful for estimating plume heights in real time.
Oxford University Press
2019-08
eng
journal article
VoR
http://hdl.handle.net/2237/00031199
https://nagoya.repo.nii.ac.jp/records/29012
https://doi.org/10.1093/gji/ggz374
0956-540X
Geophysical Journal International
219
2
1365
1376
https://nagoya.repo.nii.ac.jp/record/29012/files/ggz374.pdf
application/pdf
4.0 MB
2020-01-17