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Characteristics and source modeling of broadband seismic signals associated with the hydrothermal system at Satsuma-Iwojima Volcano, Japan
http://hdl.handle.net/2261/21024
http://hdl.handle.net/2261/21024335e845a-7332-4a10-9a05-8ebcb14440c0
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
ohminato2006.pdf (2.9 MB)
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| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2014-09-03 | |||||
| タイトル | ||||||
| タイトル | Characteristics and source modeling of broadband seismic signals associated with the hydrothermal system at Satsuma-Iwojima Volcano, Japan | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | volcanic tremor | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | regular amplitude modulation | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | Satsuma-Iwojima | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | waveform analysis | |||||
| 資源タイプ | ||||||
| 資源 | http://purl.org/coar/resource_type/c_6501 | |||||
| タイプ | journal article | |||||
| 著者 |
Ohminato, Takao
× Ohminato, Takao |
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| 著者所属 | ||||||
| 著者所属 | Earthquake Research Institute, University of Tokyo | |||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | The broadband seismic data observed at Satsuma-Iwojima volcanic island in southwestern Japan show a wide variety of interesting features. One of them is the periodic and frequency-dependent amplitude modulation of volcanic tremors. Another interesting feature is the occurrence of very long period (VLP) seismic pulses synchronized with the tremor amplitude modulation. Both the tremor amplitude modulation and the VLP pulses have fairly regular intervals of 46-50 min, suggesting a spatially fixed, non-destructive repetitive source. We performed waveform inversions to reveal the source mechanism of the VLP pulses, assuming a point source embedded in a medium that realistically represented the topography of the island. Numerical tests showed that the Green's functions used in the inversion were significantly affected by the topography. The observed VLP pulses were well explained by the rapid expansion of an inclined crack 100 m beneath the floor of the summit crater, which had a seismic moment of 3 × 10^10 Nm. Both the characteristic amplitude modulation and the VLP pulses are explained systematically by a model consisting of a water-filled crack and a network of gas paths. The water-filled crack was heated above the boiling temperature of the water in it. A sudden break of the unstable superheated state caused sudden vaporization and a pressure increase, which was observed as the VLP pulse. The network of gas paths consisted of swollen portions and constricted portions, which worked as tremor generators when vapor from the water-filled crack passed through. | |||||
| 書誌情報 |
Journal of volcanology and geothermal research 巻 158, 号 3-4, p. 467-490, 発行日 2006-09-25 |
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| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 03770273 | |||||
| 書誌レコードID | ||||||
| 収録物識別子タイプ | NCID | |||||
| 収録物識別子 | AA0070878X | |||||
| DOI | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | info:doi/10.1016/j.jvolgeores.2006.08.004 | |||||
| 権利 | ||||||
| 権利情報 | Copyright c 2006 Elsevier B.V. All rights reserved. | |||||
| 著者版フラグ | ||||||
| 値 | author | |||||
| 日本十進分類法 | ||||||
| 主題Scheme | NDC | |||||
| 主題 | 453 | |||||
| 出版者 | ||||||
| 出版者 | Elsevier | |||||
| 関係URI | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | http://www.elsevier.com/wps/find/journaldescription.librarians/503346/description#description | |||||
