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To understand the mechanisms that may introduce these seismic velocity increase and decrease, we examine several possible mechanisms of the velocity changes: stress changes due to volcanic pressure sources and caldera formation, and topographic changes. By using the deflation sources previously determined from GPS data, we calculate the stresses at depths of 0 km and 1 km at the volcano. The results suggest that the seismic velocity increases observed at seismic paths on the volcanic flank are explained by the compression caused by the deflation sources associated with magma activity in 2000. Stress sensitivities of the seismic velocity changes are estimated to be 1.5 x 10(-2) to 2.2 x 10(-2) MPa-1 and 4.6 x 10(-3) to 2.4 x 10(-2) MPa-1 at frequency bands of 0.4-0.8 Hz and 0.8-1.6 Hz, respectively, which are in the range of the previously reported results. 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  1. 防災科研関係論文

Spatio-temporal changes in seismic velocity associated with the 2000 activity of Miyakejima volcano as inferred from cross-correlation analyses of ambient noise

https://nied-repo.bosai.go.jp/records/2803
https://nied-repo.bosai.go.jp/records/2803
6e7dc170-f45f-4d6b-b60f-d59390540a56
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Spatio-temporal changes in seismic velocity associated with the 2000 activity of Miyakejima volcano as inferred from cross-correlation analyses of ambient noise
言語
言語 eng
著者 Titi Anggono

× Titi Anggono

en Titi Anggono

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Takeshi Nishimura

× Takeshi Nishimura

en Takeshi Nishimura

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Haruo Sato

× Haruo Sato

en Haruo Sato

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Hideki Ueda

× Hideki Ueda

en Hideki Ueda

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Motoo Ukawa

× Motoo Ukawa

en Motoo Ukawa

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抄録
内容記述タイプ Other
内容記述 Miyakejima volcano, Japan, showed strong and interesting volcanic activities in 2000 with the occurrence of dike intrusions, caldera formation and a large amount of gas emission. To understand temporal changes of the volcanic structure associated with this activity, we apply ambient noise correlation analyses to the seismic records of five seismic stations at Miyakejima volcano from July 1999 to December 2002. We calculate cross-correlation functions (CCFs) for eight available station pairs at frequency bands of 0.4-0.8 Hz and 0.8-1.6 Hz, and retrieve the Rayleigh waves propagating with a group velocity of about 1.0 km/s. Comparing CCFs obtained for each day with the reference CCFs that are calculated from a few months of data, we estimate seismic velocity changes before and after the 2000 activity. Results at the two frequency bands show seismic velocity increase and decrease. Shallow structure at the volcanic edifice on the flanks experienced a seismic velocity increase up to 3.3%. On the other hand, the regions located close to the collapsed caldera show a seismic velocity decrease down to 2.3%. To understand the mechanisms that may introduce these seismic velocity increase and decrease, we examine several possible mechanisms of the velocity changes: stress changes due to volcanic pressure sources and caldera formation, and topographic changes. By using the deflation sources previously determined from GPS data, we calculate the stresses at depths of 0 km and 1 km at the volcano. The results suggest that the seismic velocity increases observed at seismic paths on the volcanic flank are explained by the compression caused by the deflation sources associated with magma activity in 2000. Stress sensitivities of the seismic velocity changes are estimated to be 1.5 x 10(-2) to 2.2 x 10(-2) MPa-1 and 4.6 x 10(-3) to 2.4 x 10(-2) MPa-1 at frequency bands of 0.4-0.8 Hz and 0.8-1.6 Hz, respectively, which are in the range of the previously reported results. Our three dimensional numerical calculations on seismic wave propagation show that the seismic velocity decreases observed at seismic paths crossing the collapsed caldera can be explained by topographic changes introduced by a caldera. We further suggest that the seismic velocity decreases detected around the regions close to the caldera may originate from the dilated regions cause by formation of the caldera. (C) 2012 Elsevier B.V. All rights reserved.
言語 en
書誌情報 en : JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH

巻 247, p. 93-107, 発行日 2012-12
出版者
言語 en
出版者 ELSEVIER SCIENCE BV
ISSN
収録物識別子タイプ EISSN
収録物識別子 1872-6097
DOI
関連識別子 10.1016/j.jvolgeores.2012.08.001
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