{"created":"2021-03-01T06:51:24.311288+00:00","id":32705,"links":{},"metadata":{"_buckets":{"deposit":"49df34af-131a-40e9-aab7-ad8c9929a1b3"},"_deposit":{"id":"32705","owner":"1","owners":[],"pid":{"revision_id":0,"type":"depid","value":"32705"},"status":"published"},"_oai":{"id":"oai:repository.dl.itc.u-tokyo.ac.jp:00032705","sets":["80:4535:4691:4692","9:504:4538:4693:4694"]},"author_link":["126961","126962","126963","126958","126959","126960"],"item_4_alternative_title_1":{"attribute_name":"その他のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"Study of Gravity Anomaly on and around Izu-Oshima Volcano"}]},"item_4_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1995-03-31","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"4","bibliographicPageEnd":"350","bibliographicPageStart":"309","bibliographicVolumeNumber":"69","bibliographic_titles":[{"bibliographic_title":"東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo"}]}]},"item_4_description_13":{"attribute_name":"フォーマット","attribute_value_mlt":[{"subitem_description":"application/pdf","subitem_description_type":"Other"}]},"item_4_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"伊豆大島火山の地下構造を調べるために大島島内で稠密な重力測定を行った.周辺海域の重カデータをも合わせて作成した重力異常図の解析から以下の知見が得られた.(1)伊豆大島の東部を中心として,数十kmの広がりを持つ楕円形の正の重力異常が存在する.これは高密度な基盤が盛り上がっていることが原因であり,その位置は数十万年前に活動したとされる古い火山体に対応している.火山体の「根」は,地表で観察されるよりもずっと深く広い範囲にまで及んでいる.(2)大島火山のカルデラは正の重力異常を示し,噴火活動によって流出した高密度の溶岩が数百mの厚さで堆積しているものと考えられる.また,カルデラ壁にそって外側は負の重力異常を示すが,これは山体が空隙の多い火山噴出物で構成されているためと考えられる.(3)1986年のB,C割れ目火口列に直交する2測線の内,カルデラ壁沿いの測線では,地表に多数の割れ目が認められた付近を中心として負の重力異常が分布している.これは,割れ目噴火に伴い地殻に割れ目ができ,周りよりも見かけの密度が小さくなったためと考えられる.一方,B火口列に直交するカルデラ内の測線では有意な重力異常は見られなかったが,これは割れ目ができた効果とそこに高密度なマグマが貫入した効果とが相殺し合っているためであろう.","subitem_description_type":"Abstract"},{"subitem_description":"We conducted dense gravity surveys on Izu-Oshima island to obtain detailed information on the subterranean structure of Izu-Oshima volcano. The land gravity data are combined with those of the surrounding sea area to obtain the Bouguer gravity anomaly map on and around Izu-Oshima. Detailed analysis of the Bouguer anomaly data revealed the following. (1) We find a large-scale positive anomaly centered at the east coast of the island.","subitem_description_type":"Abstract"}]},"item_4_full_name_3":{"attribute_name":"著者別名","attribute_value_mlt":[{"nameIdentifiers":[{"nameIdentifier":"126961","nameIdentifierScheme":"WEKO"}],"names":[{"name":"ANDO, Jun"}]},{"nameIdentifiers":[{"nameIdentifier":"126962","nameIdentifierScheme":"WEKO"}],"names":[{"name":"WATANABE, Hidefumi"}]},{"nameIdentifiers":[{"nameIdentifier":"126963","nameIdentifierScheme":"WEKO"}],"names":[{"name":"SAKASHITA, Sikou"}]}]},"item_4_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.15083/0000032705","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"}]},"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_subject_15":{"attribute_name":"日本十進分類法","attribute_value_mlt":[{"subitem_subject":"453","subitem_subject_scheme":"NDC"}]},"item_4_text_21":{"attribute_name":"出版者別名","attribute_value_mlt":[{"subitem_text_value":"Earthquake Research Institute, University of Tokyo"}]},"item_4_text_4":{"attribute_name":"著者所属","attribute_value_mlt":[{"subitem_text_value":"東京大学地震研究所"},{"subitem_text_value":"三菱総合研究所"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"安藤, 潤"}],"nameIdentifiers":[{"nameIdentifier":"126958","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"渡辺, 秀文"}],"nameIdentifiers":[{"nameIdentifier":"126959","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"坂下, 至功"}],"nameIdentifiers":[{"nameIdentifier":"126960","nameIdentifierScheme":"WEKO"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2017-06-26"}],"displaytype":"detail","filename":"ji0694008.pdf","filesize":[{"value":"2.8 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"ji0694008.pdf","url":"https://repository.dl.itc.u-tokyo.ac.jp/record/32705/files/ji0694008.pdf"},"version_id":"eb506182-5fdc-46f6-9f7b-bcde36e3f007"}]},"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":"伊豆大島火山とその周辺における重力異常の研究","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"伊豆大島火山とその周辺における重力異常の研究","subitem_title_language":"ja"}]},"item_type_id":"4","owner":"1","path":["4692","4694"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2008-05-30"},"publish_date":"2008-05-30","publish_status":"0","recid":"32705","relation_version_is_last":true,"title":["伊豆大島火山とその周辺における重力異常の研究"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2022-12-19T04:08:42.176956+00:00"}