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  1. 131 地震研究所
  2. 東京大学地震研究所彙報
  3. 79
  4. 1-2
  1. 0 資料タイプ別
  2. 30 紀要・部局刊行物
  3. 東京大学地震研究所彙報
  4. 79
  5. 1-2

Interpretation of the Miyakejima 2000 eruption and dike emplacement using time animations of earthquakes

https://doi.org/10.15083/0000032549
cb1f9c6d-9719-4a0c-9dd7-bab229018bf2
名前 / ファイル ライセンス アクション
IHO79101.pdf IHO79101.pdf (9.6MB)
Item type 紀要論文 / Departmental Bulletin Paper(1)
公開日 2007-04-23
タイトル
タイトル Interpretation of the Miyakejima 2000 eruption and dike emplacement using time animations of earthquakes
言語 en
言語
言語 eng
キーワード
主題 caldera
主題Scheme Other
キーワード
主題 magma transport
主題Scheme Other
キーワード
主題 earthquake swarm
主題Scheme Other
キーワード
主題 Miyakejima
主題Scheme Other
資源タイプ
資源 http://purl.org/coar/resource_type/c_6501
タイプ departmental bulletin paper
ID登録
ID登録 10.15083/0000032549
ID登録タイプ JaLC
その他のタイトル
その他のタイトル 地震活動のアニメーションを用いた2000年三宅島噴火とダイクの貫入の解釈
著者 Thomas, L. Wright

× Thomas, L. Wright

WEKO 125552

Thomas, L. Wright

Search repository
Sakai, Shin'ichi

× Sakai, Shin'ichi

WEKO 125553

Sakai, Shin'ichi

Search repository
著者別名
識別子
識別子 125554
識別子Scheme WEKO
姓名
姓名 トーマス, ライト
著者別名
識別子
識別子 125555
識別子Scheme WEKO
姓名
姓名 酒井, 慎一
著者所属
著者所属 U.S. Geological Survey
著者所属
著者所属 University of Tokyo Earthquake Research Institute, Tokyo, Japan
抄録
内容記述タイプ Abstract
内容記述 The seismic sequence of over 12,000 earthquakes accompanying the 2000 eruption of Miyakejima volcano has been studied by viewing time animations of the earthquakes beneath transparent topography. Seismic activity began on the evening of June 26 extending southwest from Miyakejima’s summit. A few hours later the seismicity abruptly shifted to the WNW and a submarine eruption occurred off the West Coast of Miyakejima on the morning of June 27. Phreatic eruptions at Miyakejima’s summit in July were accompanied by the formation of a new caldera. Following caldera formation explosive eruptions occurred in August. The eruption ended with minor explosions in September. The seismic activity that began with a low-magnitude swarm beneath Miyakejima grew to a major swarm with hundreds of events of M>4 extending more than 40km WNW from Miyakejima. Lesser numbers of earthquakes occurred on two N-S trending lines extending south and north of the main seismic trend. The seismicity has been interpreted as evidence for emplacement of a massive dike on the main trend that triggered additional earthquakes on the two cross trends. Our interpretation involves more restricted dike emplacement west of Miyakejima, including the possibility of additional submarine eruption, following cracking of the Philippine Sea plate. The seismic activity associated with explosive eruptions in August helps to define Miyakejima’s magma plumbing. A shallow reservoir beneath the southwest slope is defined by concentrations of earthquakes at 4-6km depth, and a deeper source is suggested by a smaller number of earthquakes extending to 10km vertically beneath the shallow source. Seismic activity preceding and accompanying eruptions at Miyakejima’s summit are defined by seismic swarms extending from 4km depth to the surface along a path connecting the summit with the shallow reservoir. Away from Miyakejima shallow (<1 km) earthquake swarms at minimum rates of 1 event per hour extending over several hours occur within restricted areas of diameter less than 3km and define possible additional sites of undersea eruption or intrusion. Beneath sites west of Miyakejima the seismicity at depths of less than 4km occurs earlier and toward Miyakejima, consistent with magma transport from Miyakejima’s shallow reservoir. Shallow swarms extending 15km to the WNW strongly suggest that additional intrusion and possibly eruption may have occurred on June 27-28. Between June 27 and July 12 along the main seismic trend, and beneath the shallow sites, progressively deeper earthquake swarms occur at progressively later times, a pattern inconsistent with magma transport and interpreted here as the Philippine Sea plate cracking downward. The initial shallow cracking guided magma to the June 27 undersea eruption site. Subsequent cracking to the west allowed very rapid lateral withdrawal of magma from the Miyakejima reservoir allowing a new caldera to form. The deep cracking of the plate may have triggered additional magma sources, including a deep source suggested by the modeling of regional ground deformation data.
書誌情報 東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo

巻 79, 号 1-2, p. 1-16, 発行日 2004
ISSN
収録物識別子タイプ ISSN
収録物識別子 00408972
書誌レコードID
収録物識別子タイプ NCID
収録物識別子 AN00162258
フォーマット
内容記述タイプ Other
内容記述 application/pdf
日本十進分類法
主題 51.1
主題Scheme NDC
出版者
出版者 東京大学地震研究所
出版者別名
Earthquake Research Institute, University of Tokyo
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