{"created":"2021-03-01T06:52:07.143792+00:00","id":33348,"links":{},"metadata":{"_buckets":{"deposit":"cbbf7741-1452-4a82-9f17-2a8ca7bb541a"},"_deposit":{"id":"33348","owner":"1","owners":[],"pid":{"revision_id":0,"type":"depid","value":"33348"},"status":"published"},"_oai":{"id":"oai:repository.dl.itc.u-tokyo.ac.jp:00033348","sets":["80:4535:4899:4903","9:504:4538:4901:4904"]},"author_link":["130205","130203","130204"],"item_4_alternative_title_1":{"attribute_name":"その他のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"37.歪地震計を用いて地震波相または地球振動モードを分離する試み"}]},"item_4_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1969-11-15","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"5","bibliographicPageEnd":"848","bibliographicPageStart":"831","bibliographicVolumeNumber":"47","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":"Three component strain seismograph systems have not previously been fully utilized for separation of SV and SH waves or for separation of spheroidal and toroidal modes of free vibrations. Two new techniques have now been developed for such separation. They are illustrated with an example of free oscillation separation from the 1964 Alaskan earthquake recorded at Nokogiriyama and for separation of plane SV and SH waves, a recent example of a deep earthquake in the Japan Sea recorded at Yahiko is utilized. In the case of wave separation, no prior knowledge of the epicentral location is required. Comparison is made of this technique with that of the rotational strain seismographs of Ozawa and Watanabe. In the case of free oscillation separation, it is necessary to assume the approximate form of the source mechanism in order that the azimuthal order number of the surface harmonics can be specified. The noise level at the Nokogiriyama station was quite high during the Alaskan earthquake, and as a result only a few modes are clearly identifiable. This data can be presented only as an illustration of the technique of mode separation.|三成分歪地震計を用いれば,SV波とSH波との分離や地球振動のスフェロイダル.トロイダル両成分の分離ができるはずであるが,従来はあまり関心がもたれなかった.そこで,この目的にかなうよう考えた方法二種類を解析の実例と共に報告することにする.実例に用いられたのは,地球振動のモード分離については鋸山におけるアラスカ地震の記録であり,波相分離については最近日本海中部に発生した深発地震の弥彦における歪地震記録である.なお,前者の場合は地球振動の方位分布に関するオーダー数を指定する必要上,発震機構を知り,または仮定する必要があるけれども,後の波相分離の場合は震央位置が未知であってもかまわない.このようにして試みた結果,特に地球振動の例については原記象のS/N比がかなり低いにもかかわらず,S8～10やT8～12の周期について満足すべき値が得られた.また,波相分離のためには既にいろいろな形式の計器が提案されているが,筆者らの方法とこれら諸型式との原理的な相違についても筒単な考察を加えた.","subitem_description_type":"Abstract"}]},"item_4_full_name_3":{"attribute_name":"著者別名","attribute_value_mlt":[{"nameIdentifiers":[{"nameIdentifier":"130205","nameIdentifierScheme":"WEKO"}],"names":[{"name":"笠原, 慶一"}]}]},"item_4_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.15083/0000033348","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":"Earthquake Research Institute"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Smith, Stewart w."}],"nameIdentifiers":[{"nameIdentifier":"130203","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Kasahara, Keichi"}],"nameIdentifiers":[{"nameIdentifier":"130204","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":"ji0475001.pdf","filesize":[{"value":"1.1 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"ji0475001.pdf","url":"https://repository.dl.itc.u-tokyo.ac.jp/record/33348/files/ji0475001.pdf"},"version_id":"c38d9654-7606-43f0-85e6-d9614574d6d5"}]},"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":"37. Wave and Mode Separation with Strain Seismographs","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"37. Wave and Mode Separation with Strain Seismographs","subitem_title_language":"en"}]},"item_type_id":"4","owner":"1","path":["4903","4904"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2008-05-30"},"publish_date":"2008-05-30","publish_status":"0","recid":"33348","relation_version_is_last":true,"title":["37. Wave and Mode Separation with Strain Seismographs"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2022-12-19T04:08:47.156549+00:00"}