Temporal changes in seismic velocity of the crust around Irate volcano, Japan, as inferred from analyses of repeated active seismic experiment data from 1998 to 2003
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- Nishimura Takeshi
- Graduate School of Science, Tohoku University
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- Tanaka Satoru
- Graduate School of Science, Tohoku University
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- Yamawaki Teruo
- Graduate School of Science, Tohoku University
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- Yamamoto Hidekazu
- Faculty of Engineering, Iwate University
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- Sano Takashi
- Faculty of Engineering, Iwate University
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- Sato Minemori
- Graduate School of Science, Tohoku University
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- Nakahara Hisashi
- Graduate School of Science, Tohoku University
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- Uchida Naoki
- Graduate School of Science, Tohoku University
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- Hori Shuichiro
- Graduate School of Science, Tohoku University
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- Sato Haruo
- Graduate School of Science, Tohoku University
書誌事項
- タイトル別名
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- Temporal changes in seismic velocity of the crust around Iwate volcano, Japan, as inferred from analyses of repeated active seismic experiment data from 1998 to 2003
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We have examined temporal changes in seismic velocity of the crust through repeated active seismic experiments at Iwate volcano, Japan, where a significant volcanic activity and an M6.1 earthquake were observed in 1998. We apply a cross spectrum moving window technique to seismic data recorded at eight stations for the six explosions detonated from1998 to 2003. The seismic velocity at the frequency range of 3-9 Hz decreased by about 1% during the three months including the occurrence of M6.1 earthquake. The seismic velocity gradually increased, and about one third of the decrease was recovered by 2002. Then, the seismic velocity decreased again in 2003. Spatio-temporal changes in the volumetric strains predicted from the M6.1 fault mechanism and the volcanic pressure sources are well correlated with the seismic velocity changes observed in 1998. However, the predicted stress fields are not completely matched with the observed velocity changes from 1998 to 2003. This inconsistency may be due to unknown regional tectonic stress field and/or localized stress fields induced by volcanic pressure sources. It should be noted that the observed velocity changes indicate frequency dependent characteristics although the mechanism is not yet understood.
収録刊行物
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- Earth, Planets and Space
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Earth, Planets and Space 57 (6), 491-505, 2005
地球電磁気・地球惑星圏学会 、公益社団法人 日本地震学会、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会
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詳細情報 詳細情報について
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- CRID
- 1390282681488731648
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- NII論文ID
- 10017469082
- 130003956517
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- NII書誌ID
- AA11211921
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- ISSN
- 18805981
- 13438832
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- NDL書誌ID
- 7344320
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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