{"created":"2021-03-01T07:15:41.115959+00:00","id":54060,"links":{},"metadata":{"_buckets":{"deposit":"0449e169-6706-4d34-8295-1946a2822b95"},"_deposit":{"id":"54060","owners":[],"pid":{"revision_id":0,"type":"depid","value":"54060"},"status":"published"},"_oai":{"id":"oai:repository.dl.itc.u-tokyo.ac.jp:00054060","sets":["80:4453:8385","9:504:4455:8386"]},"author_link":["160468","160469","160470","160465","160466","160467"],"item_4_alternative_title_1":{"attribute_name":"その他のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"Precipitates on Beach Electrical Ground of Optical-cable-type Ocean-bottom Seismometer and Tsunami Meter System off the Sanriku Coast"}]},"item_4_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2019","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"9","bibliographicPageStart":"1","bibliographicVolumeNumber":"25","bibliographic_titles":[{"bibliographic_title":"技術研究報告"}]}]},"item_4_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"We found precipitates on the beach electrical ground (negative electrode) of the optical-cable-type ocean-bottom seismometer and tsunami meter system off the Sanriku coast (Sanriku system). These precipitates formed from 2014 to 2018. The DC voltage that feeds the Sanriku system began to increase and fluctuate in June 2017. This fluctuation suggests instability in the Sanriku system. To investigate the relationship between the precipitate growth and supply voltage fluctuation, we sampled and analyzed the precipitates in September 2018. The main components of the precipitates were calcium carbonate (CaCO3) and dolomite (CaMg(CO3)2), which are abundant in seawater. The metallic positive ions in seawater were drawn to the negative electrode, precipitating on the beach electrical ground and increasing its electrical resistance. This change in electrical resistance caused the observed DC voltage fluctuation. The beach electrical ground should be regularly cleaned to maintain the stability of the Sanriku system.","subitem_description_type":"Abstract"}]},"item_4_description_6":{"attribute_name":"内容記述","attribute_value_mlt":[{"subitem_description":"＜論説＞","subitem_description_type":"Other"}]},"item_4_full_name_3":{"attribute_name":"著者別名","attribute_value_mlt":[{"nameIdentifiers":[{"nameIdentifier":"160468","nameIdentifierScheme":"WEKO"}],"names":[{"name":"TANAKA, Shinichi S."}]},{"nameIdentifiers":[{"nameIdentifier":"160469","nameIdentifierScheme":"WEKO"}],"names":[{"name":"HOKANISHI, Natsumi"}]},{"nameIdentifiers":[{"nameIdentifier":"160470","nameIdentifierScheme":"WEKO"}],"names":[{"name":"SHINOHARA  Masanao"}]}]},"item_4_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.15083/00079177","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_select_14":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_select_item":"publisher"}]},"item_4_text_21":{"attribute_name":"出版者別名","attribute_value_mlt":[{"subitem_text_value":"Earthquake Research Institute, the 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技術部総合観測室"},{"subitem_text_value":"東京大学地震研究所技術部技術開発室"},{"subitem_text_value":"東京大学地震研究所観測開発基盤センター"},{"subitem_text_value":"Technical Supporting Section for Observational Research, Technical Division, Earthquake Research Institute, the University of Tokyo"},{"subitem_text_value":"Laboratory for Technical Support (Analysis Group), Technical Division, Earthquake Research Institute, the University of Tokyo"},{"subitem_text_value":"Center for Geophysical Observation and Instrumentation, Earthquake Research Institute, the University of Tokyo"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"田中, 伸一"}],"nameIdentifiers":[{"nameIdentifier":"160465","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"外西, 奈津美"}],"nameIdentifiers":[{"nameIdentifier":"160466","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"篠原, 雅尚"}],"nameIdentifiers":[{"nameIdentifier":"160467","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":"2020-05-11"}],"displaytype":"detail","filename":"25_001-009.pdf","filesize":[{"value":"7.0 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"25_001-009.pdf","url":"https://repository.dl.itc.u-tokyo.ac.jp/record/54060/files/25_001-009.pdf"},"version_id":"7e3e4783-59c6-4bff-baf8-952d24267b2f"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"Optical-cable-type ocean-bottom seismometer and tsunami meter system","subitem_subject_scheme":"Other"},{"subitem_subject":"Electrical power supply system","subitem_subject_scheme":"Other"},{"subitem_subject":"Beach ground","subitem_subject_scheme":"Other"},{"subitem_subject":"Precipitates","subitem_subject_scheme":"Other"},{"subitem_subject":"Chemical analysis","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":"三陸沖光ケーブル式海底地震・津波観測システムのビーチアース部分に発生した析出物の調査","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"三陸沖光ケーブル式海底地震・津波観測システムのビーチアース部分に発生した析出物の調査","subitem_title_language":"ja"}]},"item_type_id":"4","owner":"1","path":["8385","8386"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2020-05-11"},"publish_date":"2020-05-11","publish_status":"0","recid":"54060","relation_version_is_last":true,"title":["三陸沖光ケーブル式海底地震・津波観測システムのビーチアース部分に発生した析出物の調査"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2022-12-19T05:33:22.215960+00:00"}