{"created":"2021-03-01T06:51:32.263978+00:00","id":32822,"links":{},"metadata":{"_buckets":{"deposit":"81aeb594-24ac-44d0-8d8b-468cf6971027"},"_deposit":{"id":"32822","owner":"1","owners":[],"pid":{"revision_id":0,"type":"depid","value":"32822"},"status":"published"},"_oai":{"id":"oai:repository.dl.itc.u-tokyo.ac.jp:00032822","sets":["80:4535:4747:4753","9:504:4538:4749:4754"]},"author_link":["127780","127781","127782","127783","127776","127777","127778","127779"],"item_4_alternative_title_1":{"attribute_name":"その他のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"P-wave Source Spectra and Source Parameters of Small Earthquakes near the East Coast of Izu Peninsula, Central Japan"}]},"item_4_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1988-11-11","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"2","bibliographicPageEnd":"113","bibliographicPageStart":"99","bibliographicVolumeNumber":"63","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":"伊豆半島東岸付近で1985年10月に起ったマグニチュードM(F-P時間から決めた)1.6から4.1までの小地震のP波震源スペクトルを求め,MADARIAGA(1976)の円形クラックモデルに基づいて震源パラメータを推定した.コーナー周波数を超えた領域におけるスペクトル漸近線は大旨ω-2に比例した勾配をもっており,上記のマグニチュード範囲ではマグニチュードとコーナー周波数fcとの間にはlog(fc)=1.059(±0.028)-0.156(±0.009)Mという線形関係がある.ソースディメンション2rとマグニチュードとの間にはlog(2r)=2.268(±0.038)+0.164(±0.012)Mという関係がある.地震モーメント,応力降下,平均変位は,マグニチュードが2.6-4.1の範囲でそれぞれ,およそ0.20×1021-0.13×1023dyne-cm,5-10bar,0.3-5cmと見積られる.マグニチュードが2.0より小さい地震の波形はpathの効果を強く受けるので,震源パラメータは精度よく求まらない傾向にある.","subitem_description_type":"Abstract"},{"subitem_description":"P-wave source spectra of small earthquakes with magnitude M determined from F-P times ranging from 1.6 to 4.1, most of which ocurred in October 1985, near the east coast of the Izu Peninsula, Central Japan, are investigated, and source parameters are determined on the basis of the circular crack model of Madariaga (1976). Spectral asymptotes over the corner frequency fc have gradients approximately proportional to ω-2. In the magnitude range described above, the relationship between the magnitude and corner frequency is expressed as log(fc) =1.059(±0.028)-0.156(±0.009) M by linear regression analysis. Source dimension 2r is related to the magnitude as log(2r)=2.268 (±0.038)+0.164 (±0.012) M. Seismic moment, stress drop, and average displacement for 2.6≦M≦4.1 are estimated to be about 0.20×1021-0.13×1023 dyne-cm, 5-50 bar, and 0.3- 5 cm, respectively. Wave forms of earthquakes with magnitude less than 2.0 suffer strong effects on the propagation path, and source parameters cannot be estimated precisely.","subitem_description_type":"Abstract"}]},"item_4_full_name_3":{"attribute_name":"著者別名","attribute_value_mlt":[{"nameIdentifiers":[{"nameIdentifier":"127780","nameIdentifierScheme":"WEKO"}],"names":[{"name":"Yoshida, Mitsuru"}]},{"nameIdentifiers":[{"nameIdentifier":"127781","nameIdentifierScheme":"WEKO"}],"names":[{"name":"Mizoue, Megumi"}]},{"nameIdentifiers":[{"nameIdentifier":"127782","nameIdentifierScheme":"WEKO"}],"names":[{"name":"Chiba, Heihachiro"}]},{"nameIdentifiers":[{"nameIdentifier":"127783","nameIdentifierScheme":"WEKO"}],"names":[{"name":"Hagiwara, Hiroko"}]}]},"item_4_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.15083/0000032822","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":"地震研究所"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"吉田, 満"}],"nameIdentifiers":[{"nameIdentifier":"127776","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"溝上, 恵"}],"nameIdentifiers":[{"nameIdentifier":"127777","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"千葉, 平八郎"}],"nameIdentifiers":[{"nameIdentifier":"127778","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"萩原, 弘子"}],"nameIdentifiers":[{"nameIdentifier":"127779","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":"ji0632003.pdf","filesize":[{"value":"743.2 kB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"ji0632003.pdf","url":"https://repository.dl.itc.u-tokyo.ac.jp/record/32822/files/ji0632003.pdf"},"version_id":"a456c03b-279e-4024-be9d-8bed248df016"}]},"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":"伊豆半島東岸付近の小地震P波震源スペクトルと震源パラメータ","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"伊豆半島東岸付近の小地震P波震源スペクトルと震源パラメータ","subitem_title_language":"ja"}]},"item_type_id":"4","owner":"1","path":["4753","4754"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2008-05-30"},"publish_date":"2008-05-30","publish_status":"0","recid":"32822","relation_version_is_last":true,"title":["伊豆半島東岸付近の小地震P波震源スペクトルと震源パラメータ"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2022-12-19T04:08:45.832747+00:00"}