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<i>S</i>-wave modelling of the Showa-Shinzan lava dome in Usu Volcano, Northern Japan, from seismic observations
https://nied-repo.bosai.go.jp/records/2930
https://nied-repo.bosai.go.jp/records/2930ccc7f369-76da-43e6-a38e-06fcbbfdec42
| Item type | researchmap(1) | |||||||||||||||||||||||||||||||||
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| 公開日 | 2023-03-30 | |||||||||||||||||||||||||||||||||
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| 言語 | en | |||||||||||||||||||||||||||||||||
| タイトル | <i>S</i>-wave modelling of the Showa-Shinzan lava dome in Usu Volcano, Northern Japan, from seismic observations | |||||||||||||||||||||||||||||||||
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| 言語 | eng | |||||||||||||||||||||||||||||||||
| 著者 |
Akiko Takeo
× Akiko Takeo
× Kiwamu Nishida
× Hiroshi Aoyama
× Motoko Ishise
× Takeru Kai
× Ryo Kurihara
× Takuto Maeda
× Yuta Mizutani
× Yuki Nakashima
× Shogo Nagahara
× Xiaowen Wang
× Lingling Ye
× Takeshi Akuhara
× Yosuke Aoki
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| 内容記述タイプ | Other | |||||||||||||||||||||||||||||||||
| 内容記述 | SUMMARY To obtain an internal S-wave velocity structure, we conducted a passive seismic campaign with 21 1-Hz seismometers on and around the Showa-Shinzan lava dome, which emerged during the 1943?1945 eruption of Usu Volcano, Japan. Before the campaign, we calibrated seismometers and found slight phase-response differences between seismometers of less than 1?2°. After the campaign, we extracted seismic wavefield by taking cross-correlations of vertical-component ambient noise records between seismic sites. We developed a new method to measure phase velocities of the Rayleigh wave automatically by assuming layered structure and finally obtained 1-D S-wave velocity models in summit, roof and base regions. The obtained S-wave velocity right beneath the intruded lava dome is higher than that in surrounding areas by a few tens of per cent down to a few hundred metres below sea level, indicating narrow but deep existence of the root of the lava dome. The obtained S-wave velocity at depths shallower than ?50?m inside the lava dome in the summit area was ?1?km?s?1, significantly lower than that predicted from the density of ?2.3 × 103?kg?m?3 estimated in previous muon-radiography studies and a conventional scaling, indicating the effect of cracking in the lava dome. |
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| 言語 | en | |||||||||||||||||||||||||||||||||
| 書誌情報 |
en : Geophysical Journal International 巻 230, 号 3, p. 1662-1678, 発行日 2022-05-19 |
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| 言語 | en | |||||||||||||||||||||||||||||||||
| 出版者 | Oxford University Press (OUP) | |||||||||||||||||||||||||||||||||
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| 収録物識別子タイプ | EISSN | |||||||||||||||||||||||||||||||||
| 収録物識別子 | 1365-246X | |||||||||||||||||||||||||||||||||
| DOI | ||||||||||||||||||||||||||||||||||
| 関連識別子 | 10.1093/gji/ggac111 | |||||||||||||||||||||||||||||||||
