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A total of 15 sites were visited for sampling; eight sites on Chichi-jima, four on Haha-jima, two on Muko-jima and one on Yome-jima. The directions of natural remanent magnetization of the samples after alternating field demagnetization not only deflect considerably from the present geomagnetic field but they clearly show that Chichi-jima differs from the other islands. That is, the mean direction for the eight sites on Chichi-jima is I=15°, D=90°, α95=27°, while that on the other islands is I=3°, D=207, α95=18°. The offset declinations and shallow inclinations may be explained tectonically by a clockwise rotation and northward drift of the islands since Early Tertiary, although the anomalous geomagnetic behaviors in a transient stage can be an alternative interpretation at the present stage of investigation.", "subitem_description_type": "Abstract"}, {"subitem_description": "小笠原諸島(北緯27度,東経142度)の火山岩に関する古地磁気学的研究を行なった.総計15ケ所(父島8ケ所,母島4ケ所,婿島2ケ所,嫁島1ケ所)から岩石試料を採取した.それらの残留磁化の方向は,現在の地球磁場の方向から著しくずれるばかりでなく,父島とその他の島々の間でも大きな相違のあることが分った.すなわち,父島の8ケ所の平均残留磁化方向が,伏角15度,偏角90度,誤差半径(95%信頼度)27度であるのに対し,その他の島々の平均は伏角3度,偏角207度,誤差半径18度である.このようにずれた偏角と浅い伏角は,現段階では一時的な地球磁場の異常でも説明できるが,小笠原諸島の第三紀早期以来の時計回りの回転と北方への移動という構造運動によって説明することもできる.", "subitem_description_type": "Abstract"}]}, "item_4_full_name_3": {"attribute_name": "著者別名", "attribute_value_mlt": [{"nameIdentifiers": [{"nameIdentifier": "128774", "nameIdentifierScheme": "WEKO"}], "names": [{"name": "小玉, 一人"}]}]}, "item_4_identifier_registration": {"attribute_name": "ID登録", "attribute_value_mlt": [{"subitem_identifier_reg_text": "10.15083/0000033028", "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_34": {"attribute_name": "資源タイプ", "attribute_value_mlt": [{"subitem_text_value": "Departmental Bulletin Paper"}]}, "item_4_text_4": {"attribute_name": "著者所属", "attribute_value_mlt": [{"subitem_text_value": "地震研究所"}]}, "item_creator": {"attribute_name": "著者", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "Kodama, Kazuto"}], "nameIdentifiers": [{"nameIdentifier": "128773", "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", "download_preview_message": "", "file_order": 0, "filename": "ji0562003.pdf", "filesize": [{"value": "954.2 kB"}], "format": "application/pdf", "future_date_message": "", "is_thumbnail": false, "licensetype": "license_free", "mimetype": "application/pdf", "size": 954200.0, "url": {"label": "ji0562003.pdf", "url": "https://repository.dl.itc.u-tokyo.ac.jp/record/33028/files/ji0562003.pdf"}, "version_id": "a36e493e-e68a-4540-8b5c-7d32da544248"}]}, "item_language": {"attribute_name": "言語", "attribute_value_mlt": [{"subitem_language": "eng"}]}, "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": "A Paleomagnetic Reconnaissance of the Bonin Islands", "item_titles": {"attribute_name": "タイトル", "attribute_value_mlt": [{"subitem_title": "A Paleomagnetic Reconnaissance of the Bonin Islands", "subitem_title_language": "en"}]}, "item_type_id": "4", "owner": "1", "path": ["4823", "4824"], "permalink_uri": "https://doi.org/10.15083/0000033028", "pubdate": {"attribute_name": "PubDate", "attribute_value": "2008-05-30"}, "publish_date": "2008-05-30", "publish_status": "0", "recid": "33028", "relation": {}, "relation_version_is_last": true, "title": ["A Paleomagnetic Reconnaissance of the Bonin Islands"], "weko_shared_id": -1}
A Paleomagnetic Reconnaissance of the Bonin Islands
https://doi.org/10.15083/0000033028
https://doi.org/10.15083/0000033028a8ab55cd-671b-4b93-91ec-ffaf82ae2a28
名前 / ファイル | ライセンス | アクション |
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ji0562003.pdf (954.2 kB)
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Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
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公開日 | 2008-05-30 | |||||
タイトル | ||||||
タイトル | A Paleomagnetic Reconnaissance of the Bonin Islands | |||||
言語 | en | |||||
言語 | ||||||
言語 | eng | |||||
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 | 10.15083/0000033028 | |||||
ID登録タイプ | JaLC | |||||
その他のタイトル | ||||||
その他のタイトル | 小笠原諸島の古地磁気学的予察 | |||||
著者 |
Kodama, Kazuto
× Kodama, Kazuto |
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著者別名 | ||||||
識別子 | 128774 | |||||
識別子Scheme | WEKO | |||||
姓名 | 小玉, 一人 | |||||
著者所属 | ||||||
著者所属 | 地震研究所 | |||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | A paleomagnetic study has been carried out on the volcanic rocks of the Bonin Islands (27°N, 142°E). A total of 15 sites were visited for sampling; eight sites on Chichi-jima, four on Haha-jima, two on Muko-jima and one on Yome-jima. The directions of natural remanent magnetization of the samples after alternating field demagnetization not only deflect considerably from the present geomagnetic field but they clearly show that Chichi-jima differs from the other islands. That is, the mean direction for the eight sites on Chichi-jima is I=15°, D=90°, α95=27°, while that on the other islands is I=3°, D=207, α95=18°. The offset declinations and shallow inclinations may be explained tectonically by a clockwise rotation and northward drift of the islands since Early Tertiary, although the anomalous geomagnetic behaviors in a transient stage can be an alternative interpretation at the present stage of investigation. | |||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | 小笠原諸島(北緯27度,東経142度)の火山岩に関する古地磁気学的研究を行なった.総計15ケ所(父島8ケ所,母島4ケ所,婿島2ケ所,嫁島1ケ所)から岩石試料を採取した.それらの残留磁化の方向は,現在の地球磁場の方向から著しくずれるばかりでなく,父島とその他の島々の間でも大きな相違のあることが分った.すなわち,父島の8ケ所の平均残留磁化方向が,伏角15度,偏角90度,誤差半径(95%信頼度)27度であるのに対し,その他の島々の平均は伏角3度,偏角207度,誤差半径18度である.このようにずれた偏角と浅い伏角は,現段階では一時的な地球磁場の異常でも説明できるが,小笠原諸島の第三紀早期以来の時計回りの回転と北方への移動という構造運動によって説明することもできる. | |||||
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 56, 号 2, p. 347-365, 発行日 1981-09-30 |
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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 | 453 | |||||
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 |