WEKO3
アイテム
{"_buckets": {"deposit": "4a1d0000-6975-48eb-aab3-f64276582fbb"}, "_deposit": {"id": "33518", "owner": "1", "owners": [], "pid": {"revision_id": 0, "type": "depid", "value": "33518"}, "status": "published"}, "_oai": {"id": "oai:repository.dl.itc.u-tokyo.ac.jp:00033518", "sets": ["4935", "4936"]}, "author_link": ["130918", "130917"], "item_4_alternative_title_1": {"attribute_name": "その他のタイトル", "attribute_value_mlt": [{"subitem_alternative_title": "伊豆大島に於ける地磁気短周期変化の異常(1)"}]}, "item_4_biblio_info_7": {"attribute_name": "書誌情報", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "1967-06-15", "bibliographicIssueDateType": "Issued"}, "bibliographicIssueNumber": "1", "bibliographicPageEnd": "157", "bibliographicPageStart": "137", "bibliographicVolumeNumber": "45", "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": "Simultaneous observations with three portable magnetometers are made at a number of stations on Oshima Island, a volcanic island about 100km south of Tokyo. The observations bring to light remarkable differences in short-period Z variation between various stations on such a small island, approximately 10 km in diameter. Z variations having a period of 30min. or so show a complete reversal of sign between the north and south sides of the island, while no marked differences are found for slower variations such as Sq. Such an anomaly seems to be caused by electric currents induced in the surrounding sea-water by changes in the geomagnetic field of external origin. Statistical as well as spectral analyses are made on the available data obtained along the N-S profile. Even if the anomalous part due to the sea-water effect is removed on a simple assumption, it seems likely that there still remains a substantial enhancement of the Z variations of short period. It is therefore concluded that Oshima Island belongs to the anomalous area of the \"\"Central Japan Anomaly\"\" which has been well-established by nation-wide observations in the past.", "subitem_description_type": "Abstract"}, {"subitem_description": "1966年春以来携帯用フラックスゲイト型磁力計を用い,伊豆大島の各所で地磁気変化の同時観測を行なった結果,短周期のz成分が島内各地で著しく異なることを見出した.即ち数分から数十分の,継続時間を持つ短周期擾乱において島の南と北でz成分が全く逆転し,島の中央部では位相の遅れが起る.この現象は外部磁場の変動によって海水中に誘起された電流が不良導体である島の周囲を流れ,それによって作られた2次的な磁場によるものらしい.十分な観測資料が得られた南北のプロファイルについて,スペクトル解析を行なって,この現象の周期特性を調べた.簡単な仮定の下に,海の影響による二次的磁場と大島全体でほぼ一様と考えられる一次的な部分とを分離すると,一次成分においても大きな振幅が得られ,大島は日本列島中央部の地磁気変化異常領域に属することを示している.又二次的成分は周期が長くなると共に減少し,日変化になると消失している.", "subitem_description_type": "Abstract"}]}, "item_4_full_name_3": {"attribute_name": "著者別名", "attribute_value_mlt": [{"nameIdentifiers": [{"nameIdentifier": "130918", "nameIdentifierScheme": "WEKO"}], "names": [{"name": "笹井, 洋一"}]}]}, "item_4_identifier_registration": {"attribute_name": "ID登録", "attribute_value_mlt": [{"subitem_identifier_reg_text": "10.15083/0000033518", "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_creator": {"attribute_name": "著者", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "Sasai, Yoichi"}], "nameIdentifiers": [{"nameIdentifier": "130917", "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": "ji0451009.pdf", "filesize": [{"value": "1.2 MB"}], "format": "application/pdf", "future_date_message": "", "is_thumbnail": false, "licensetype": "license_free", "mimetype": "application/pdf", "size": 1200000.0, "url": {"label": "ji0451009.pdf", "url": "https://repository.dl.itc.u-tokyo.ac.jp/record/33518/files/ji0451009.pdf"}, "version_id": "2023c254-0be8-4e62-8713-96533077d93b"}]}, "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": "Spatial Dependence of Short-period Geomagnetic Fluctuations on Oshima Island (1)", "item_titles": {"attribute_name": "タイトル", "attribute_value_mlt": [{"subitem_title": "Spatial Dependence of Short-period Geomagnetic Fluctuations on Oshima Island (1)", "subitem_title_language": "en"}]}, "item_type_id": "4", "owner": "1", "path": ["4935", "4936"], "permalink_uri": "https://doi.org/10.15083/0000033518", "pubdate": {"attribute_name": "PubDate", "attribute_value": "2008-05-30"}, "publish_date": "2008-05-30", "publish_status": "0", "recid": "33518", "relation": {}, "relation_version_is_last": true, "title": ["Spatial Dependence of Short-period Geomagnetic Fluctuations on Oshima Island (1)"], "weko_shared_id": -1}
Spatial Dependence of Short-period Geomagnetic Fluctuations on Oshima Island (1)
https://doi.org/10.15083/0000033518
https://doi.org/10.15083/00000335185390298d-f717-4205-a208-2bd58c14f7e3
名前 / ファイル | ライセンス | アクション |
---|---|---|
ji0451009.pdf (1.2 MB)
|
|
Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
---|---|---|---|---|---|---|
公開日 | 2008-05-30 | |||||
タイトル | ||||||
タイトル | Spatial Dependence of Short-period Geomagnetic Fluctuations on Oshima Island (1) | |||||
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 | 10.15083/0000033518 | |||||
ID登録タイプ | JaLC | |||||
その他のタイトル | ||||||
その他のタイトル | 伊豆大島に於ける地磁気短周期変化の異常(1) | |||||
著者 |
Sasai, Yoichi
× Sasai, Yoichi |
|||||
著者別名 | ||||||
識別子 | 130918 | |||||
識別子Scheme | WEKO | |||||
姓名 | 笹井, 洋一 | |||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Simultaneous observations with three portable magnetometers are made at a number of stations on Oshima Island, a volcanic island about 100km south of Tokyo. The observations bring to light remarkable differences in short-period Z variation between various stations on such a small island, approximately 10 km in diameter. Z variations having a period of 30min. or so show a complete reversal of sign between the north and south sides of the island, while no marked differences are found for slower variations such as Sq. Such an anomaly seems to be caused by electric currents induced in the surrounding sea-water by changes in the geomagnetic field of external origin. Statistical as well as spectral analyses are made on the available data obtained along the N-S profile. Even if the anomalous part due to the sea-water effect is removed on a simple assumption, it seems likely that there still remains a substantial enhancement of the Z variations of short period. It is therefore concluded that Oshima Island belongs to the anomalous area of the ""Central Japan Anomaly"" which has been well-established by nation-wide observations in the past. | |||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | 1966年春以来携帯用フラックスゲイト型磁力計を用い,伊豆大島の各所で地磁気変化の同時観測を行なった結果,短周期のz成分が島内各地で著しく異なることを見出した.即ち数分から数十分の,継続時間を持つ短周期擾乱において島の南と北でz成分が全く逆転し,島の中央部では位相の遅れが起る.この現象は外部磁場の変動によって海水中に誘起された電流が不良導体である島の周囲を流れ,それによって作られた2次的な磁場によるものらしい.十分な観測資料が得られた南北のプロファイルについて,スペクトル解析を行なって,この現象の周期特性を調べた.簡単な仮定の下に,海の影響による二次的磁場と大島全体でほぼ一様と考えられる一次的な部分とを分離すると,一次成分においても大きな振幅が得られ,大島は日本列島中央部の地磁気変化異常領域に属することを示している.又二次的成分は周期が長くなると共に減少し,日変化になると消失している. | |||||
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 45, 号 1, p. 137-157, 発行日 1967-06-15 |
|||||
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 |