{"created":"2021-03-01T06:52:01.803649+00:00","id":33268,"links":{},"metadata":{"_buckets":{"deposit":"a8d0f9b9-20c8-4498-b306-9de79ef5b51d"},"_deposit":{"id":"33268","owner":"1","owners":[],"pid":{"revision_id":0,"type":"depid","value":"33268"},"status":"published"},"_oai":{"id":"oai:repository.dl.itc.u-tokyo.ac.jp:00033268","sets":["80:4535:4885:4886","9:504:4538:4887:4888"]},"author_link":["129882","129881"],"item_4_alternative_title_1":{"attribute_name":"その他のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"56.中規模地震前後の地震活動の微細構造"}]},"item_4_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1971-01-30","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"6","bibliographicPageEnd":"1067","bibliographicPageStart":"1053","bibliographicVolumeNumber":"48","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":"Micro-seismicity was investigated concerning the seismic sequence related to a moderate earthquake which occurred on April 9 of 1970 in the swarm area of the Matsushiro earthquakes. Though the area of the aftershock activity was as small as 18km2, the following peculiar features were found by a precise analysis. (1) The foreshock and the larger aftershocks seem to be arranged on a inclined plate, whose length and width are 10km and 2km, respectively. (2) Most of the smaller aftershocks cluster by the upper side of this plate. (3) The main shock is located on the deeper end of the plate, and the aftershock activity is rather weak around it. Regarding the push-pull distribution of the main event, the fracture accompanying the main shock is supposed to have run upwards for ten kilometers along the plane of the larger aftershocks. The dislocation may be a left-lateral strike slip. Another interesting characteristic is the independent behavior of the active groups in the swarm area. The present event, which occurred in one of the southwestern active groups, never excited nor stilled the ordinary seismic activity of the other groups. This fact would be reflecting the mosaic structure of the medium, and would explain the curious lacking of larger shocks through the Matsushiro earthquake swarm. The continuous observation with broad dynamic range was essential for this study.|1970年4月9日,松代付近に発生したM=5.0(気象庁)の中規模地震について,その前後の地震活動の微細構造を調べた.余震域はわずか18km2にすぎないが,信頼度の高い観測と解析によって次のような特徴ある余震空間分布を見出すことができた.(1)比較的大きい余震及び前震は,長さ10km,巾2kmの傾斜した「余震面」に添って排列する傾向を示す.より小さい余震はこの面より上方に分布するものが圧倒的に多いが,深さ9km以浅では下方にも多数の震源が分布する.(2)主震は余震面の最深端に位置する.この付近では余震活動が相対的に不活発である.(3)余震面の走行は,主震の初動押引分布の一方の節線と概ね一致する.この余震面を主震に伴う破壊面とみなすことが許されるならば,左横ずれのくいちがいが地下14kmから斜め上方に向って約10km進行したことになる.此度の地震は,松代地震群発域内の顕著な活動群のひとつに発生した.しかし地震発生の直前2～3ヶ月の間特にこの活動群は異常に静穏であった.余震はこの活動群の範囲内に限られ,主震の前後数ヶ月を通じて,他の活動群からのエネルギー放出水準は何らの影響も受けなかった.松代地震の群発域は,このように相互に独立した数個の活動ブロックの集合体として理解さるべきではなかろうか.全群発域を単一の「地震体積」とするようなM6規模の地震が現在まで発生していないという事実は,松代付近の地殻浅部がいくつものブロックに分割されていることを示唆している.","subitem_description_type":"Abstract"}]},"item_4_full_name_3":{"attribute_name":"著者別名","attribute_value_mlt":[{"nameIdentifiers":[{"nameIdentifier":"129882","nameIdentifierScheme":"WEKO"}],"names":[{"name":"大竹, 政和"}]}]},"item_4_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.15083/0000033268","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":"Ohtake, Masakazu"}],"nameIdentifiers":[{"nameIdentifier":"129881","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":"ji0486003.pdf","filesize":[{"value":"1.1 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"ji0486003.pdf","url":"https://repository.dl.itc.u-tokyo.ac.jp/record/33268/files/ji0486003.pdf"},"version_id":"450951d4-0bf3-4a80-993f-aaefad2080ef"}]},"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":"56. Micro-structure of the Seismic Sequence Related to a Moderate Earthquake","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"56. Micro-structure of the Seismic Sequence Related to a Moderate Earthquake","subitem_title_language":"en"}]},"item_type_id":"4","owner":"1","path":["4886","4888"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2009-02-18"},"publish_date":"2009-02-18","publish_status":"0","recid":"33268","relation_version_is_last":true,"title":["56. Micro-structure of the Seismic Sequence Related to a Moderate Earthquake"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2022-12-19T04:35:36.547268+00:00"}