{"created":"2021-03-01T06:52:39.997422+00:00","id":33838,"links":{},"metadata":{"_buckets":{"deposit":"96a2cc14-1b15-436b-a4cf-39b9540cd6dc"},"_deposit":{"id":"33838","owner":"1","owners":[],"pid":{"revision_id":0,"type":"depid","value":"33838"},"status":"published"},"_oai":{"id":"oai:repository.dl.itc.u-tokyo.ac.jp:00033838","sets":["80:4535:4997:4998","9:504:4538:4999:5000"]},"author_link":["132046","132045"],"item_4_alternative_title_1":{"attribute_name":"その他のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"29.不均質な媒質内を伝る弾性波の安定性について : 見掛けの内部摩擦係数"}]},"item_4_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1961-01-10","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"4","bibliographicPageEnd":"478","bibliographicPageStart":"467","bibliographicVolumeNumber":"38","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":"弾性波の速度をc(x)=α(1+b cos γx)としてMathieuの微分方程式によつてかかる媒質内を伝播する弾性波の安定性をしらべた.考えとしては古い問題であるが波動伝播の理論とむすびつけて具体的に取扱つた例はない様である.地震波の観測に現われるいわゆる内部摩擦の見掛値との関係をしらべるとbの値がほとんど直接摩擦係数1/Qに相当することになるのでその影響は見逃し得ないものがある.媒質のinternal frictionを1/Qとすればある特定の周知τ=4π/αγの波,波長で比較すれば媒質の構造上の波長2π/γの2倍の波長の波に対する振巾減衰の式は結局A=1/cosh(πbx/ατ) exp(-πx/Qατ)で表わされる.したがつてその様な構造がつづく限り遠いところでの傾向を見ればそのような波に対する媒質の見掛けのinternal frictionは|b|+1/Qとなる.今後調査すべきことは地殻内の弾性波の速度は場所によつてある平均値を上下しているであろうが,それをc(x)=α(1+Σnbncosγnx)の形においた時|bn|の大いさが種々のγnに対してどのような値を取るかである.","subitem_description_type":"Abstract"}]},"item_4_full_name_3":{"attribute_name":"著者別名","attribute_value_mlt":[{"nameIdentifiers":[{"nameIdentifier":"132046","nameIdentifierScheme":"WEKO"}],"names":[{"name":"吉山, 良一"}]}]},"item_4_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.15083/0000033838","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":"Yoshiyama, Ryoichi"}],"nameIdentifiers":[{"nameIdentifier":"132045","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":"2017-06-27"}],"displaytype":"detail","filename":"ji0384001.pdf","filesize":[{"value":"661.2 kB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"ji0384001.pdf","url":"https://repository.dl.itc.u-tokyo.ac.jp/record/33838/files/ji0384001.pdf"},"version_id":"b5ae24eb-2473-4f0b-a8de-7e5ee5a6c22c"}]},"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":"29. Stability of Waves through a Heterogeneous Medium and Apparent Internal Friction","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"29. Stability of Waves through a Heterogeneous Medium and Apparent Internal Friction","subitem_title_language":"en"}]},"item_type_id":"4","owner":"1","path":["4998","5000"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2008-05-30"},"publish_date":"2008-05-30","publish_status":"0","recid":"33838","relation_version_is_last":true,"title":["29. Stability of Waves through a Heterogeneous Medium and Apparent Internal Friction"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2022-12-19T04:58:08.287687+00:00"}