{"created":"2021-12-22T07:31:37.529269+00:00","id":2002957,"links":{},"metadata":{"_buckets":{"deposit":"5609767e-e208-483d-8523-3b8d647f499f"},"_deposit":{"id":"2002957","owner":"1","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"2002957"},"status":"published"},"_oai":{"id":"oai:repository.dl.itc.u-tokyo.ac.jp:02002957","sets":["80:4535:1640155726797:1640155796618","9:504:4538:1640155606349:1640155663480"]},"author_link":[],"control_number":"2002957","item_4_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2021-12-07","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"1-2","bibliographicPageEnd":"27","bibliographicPageStart":"11","bibliographicVolumeNumber":"96","bibliographic_titles":[{"bibliographic_title":"東京大学地震研究所彙報","bibliographic_titleLang":"ja"},{"bibliographic_title":"Bulletin of the Earthquake Research Institute, University of Tokyo","bibliographic_titleLang":"en"}]}]},"item_4_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"Seismic exploration was conducted to reveal the velocity structure beneath Izu-Oshima volcano in 2009. This paper documented an overview of the exploration, detailed data processing and estimated velocity structure, as well as the contents of the acquired data archive, which will be freely opened to the research community. Thirty-eight ocean bottom seismometers (OBS) were deployed along a survey line extending WSW to ENE with an interval of around two kilometers, and around 300 seismometers were installed on land with an interval of 50 to 100m. The entire survey line passed through Izu-Oshima island, including the central summit of the volcano, and reached approximately 70km in length. The controlled sources were dynamite explosions, each with a charge of 300 kg, located at nine points along the OBS survey line, and a pressure source (air-gun: with a capacity 50l) deployed along the OBS survey line and around off the coast of Izu-Oshima island.\nThe upper and middle crust velocity structure beneath Izu-Oshima volcano and its surrounding region are estimated to a depth of around 10km using the 2D ray tracing method. As with other volcanoes, a convex basement structure is found at a depth of seven kilometers beneath the volcanic edifice. An interesting relation is found among estimated velocity structure and volcanic seismicity as well as ground deformation sources. Ground inflation and deflation sources and hypocenters of volcano-tectonic earthquakes with burst-type activity are limited in the upper middle crust with a P wave velocity of 5.5-6.0 km/s. On the other hand, persistently activated earthquakes just beneath the summit caldera are located in the upper crust, whose velocity is very low. This suggests that the magma storage and plumbing system of the volcano is defined strongly by a layered structure. Revealing the structure beneath volcanoes is essential for understanding their activities.","subitem_description_language":"en","subitem_description_type":"Abstract"}]},"item_4_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.15083/0002002957","subitem_identifier_reg_type":"JaLC"}]},"item_4_publisher_20":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"東京大学地震研究所","subitem_publisher_language":"ja"},{"subitem_publisher":"Earthquake Research Institute, The University of Tokyo","subitem_publisher_language":"en"}]},"item_4_source_id_10":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AN00162258","subitem_source_identifier_type":"NCID"}]},"item_4_source_id_8":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"00408972","subitem_source_identifier_type":"ISSN"}]},"item_4_text_4":{"attribute_name":"著者所属","attribute_value_mlt":[{"subitem_text_language":"ja","subitem_text_value":"東京大学地震研究所"},{"subitem_text_language":"ja","subitem_text_value":"国立研究開発法人防災科学技術研究所"},{"subitem_text_language":"en","subitem_text_value":"Earthquake Research Institute, The University of Tokyo"},{"subitem_text_language":"en","subitem_text_value":"National Research Institute for Earth Science and Disaster Resilience"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorAffiliations":[{"affiliationNames":[{"affiliationName":"東京大学","affiliationNameLang":"ja"},{"affiliationName":"The University of Tokyo","affiliationNameLang":"en"}]},{"affiliationNames":[{"affiliationName":"国立研究開発法人防災科学技術研究所","affiliationNameLang":"ja"},{"affiliationName":"National Research Institute for Earth Science and Disaster Resilience","affiliationNameLang":"en"}]}],"creatorNames":[{"creatorName":"森田, 裕一","creatorNameLang":"ja"},{"creatorName":"Morita, Yuichi","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"2009年伊豆大島構造探査実験グループ","creatorNameLang":"ja"},{"creatorName":"Survey team of 2009 seismic exploration at Izu-Oshima volcano","creatorNameLang":"en"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"date":[{"dateType":"Available","dateValue":"2021-12-20"}],"displaytype":"detail","filename":"IHO961202.pdf","filesize":[{"value":"9.9 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"objectType":"fulltext","url":"https://repository.dl.itc.u-tokyo.ac.jp/record/2002957/files/IHO961202.pdf"},"version_id":"4509d764-8aed-41a2-88b3-9dc8038e1bae"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"Izu-Oshima volcano","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"seismic structure","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"seismic exploration","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"seismicity and structure","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"magma plumbing system","subitem_subject_language":"en","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"departmental bulletin paper","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"2009年海中爆破実験による伊豆大島及びその周辺の地震波速度構造","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"2009年海中爆破実験による伊豆大島及びその周辺の地震波速度構造","subitem_title_language":"ja"},{"subitem_title":"Velocity Structure at Izu-Oshima Volcano and its Surrounding Region Inferred from 2009 Seismic Explorations Using Sea-shots","subitem_title_language":"en"}]},"item_type_id":"4","owner":"1","path":["1640155796618","1640155663480"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2021-12-21"},"publish_date":"2021-12-21","publish_status":"0","recid":"2002957","relation_version_is_last":true,"title":["2009年海中爆破実験による伊豆大島及びその周辺の地震波速度構造"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2022-12-19T05:33:04.782997+00:00"}