{"_buckets": {"deposit": "601d2e30-feac-4276-9993-7803f913cf59"}, "_deposit": {"id": "32919", "owner": "1", "owners": [], "pid": {"revision_id": 0, "type": "depid", "value": "32919"}, "status": "published"}, "_oai": {"id": "oai:repository.dl.itc.u-tokyo.ac.jp:00032919", "sets": []}, "author_link": ["128370", "128369"], "item_4_alternative_title_1": {"attribute_name": "\u305d\u306e\u4ed6\u306e\u30bf\u30a4\u30c8\u30eb", "attribute_value_mlt": [{"subitem_alternative_title": "\u95a2\u6771\u5730\u65b9\u306e\u5730\u6bbb\u4e0b\u5730\u9707\u306e\u767a\u9707\u6a5f\u69cb\u3068\u9707\u6e90\u5206\u5e03 : \u3068\u304f\u306b\u6d3b\u52d5\u57df\u306b\u3064\u3044\u3066"}]}, "item_4_biblio_info_7": {"attribute_name": "\u66f8\u8a8c\u60c5\u5831", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "1984-10-20", "bibliographicIssueDateType": "Issued"}, "bibliographicIssueNumber": "2", "bibliographicPageEnd": "196", "bibliographicPageStart": "127", "bibliographicVolumeNumber": "59", "bibliographic_titles": [{"bibliographic_title": "\u6771\u4eac\u5927\u5b78\u5730\u9707\u7814\u7a76\u6240\u5f59\u5831 = Bulletin of the Earthquake Research Institute, University of Tokyo"}]}]}, "item_4_description_13": {"attribute_name": "\u30d5\u30a9\u30fc\u30de\u30c3\u30c8", "attribute_value_mlt": [{"subitem_description": "application/pdf", "subitem_description_type": "Other"}]}, "item_4_description_5": {"attribute_name": "\u6284\u9332", "attribute_value_mlt": [{"subitem_description": "Subcrustal earthquakes beneath the Kanto District and vicinity show some intense clusters of hypocenters at some regions and depths, especially in the western part of Ibaraki and Chiba Prefectures. Relative locations and spatial alignments of the hypocenter clusters are derived from the precisely relocated hypocenters by correcting the Pn station biases. For 487 out of 1029 subcrustal earthquakes, which occurred with magnitudes of 4.0 or more in and around the Kanto District during the period from 1963 to 1980, 704 fault-plane solutions, satisfying 10 or more first-motion data have been determined. Variable focal mechanisms of subcrustal earthquakes are caused by the convergence of three lithospheric plates, the intersection of the Northeast Honshu and Izu-Bonin slabs at depths and such additional processes as the back-arc spreading and bending of the lithospheric plate near the trench. Focal mechanisms of earthquakes in the intense clusters have a consistency with the spatial trend in the hypocenter distribution. Two clusters separated by the 140\u00b0E line and at different depths beneath the southwestern part of Ibaraki Prefecture show the northwest lineament with the reverse faults of the NW-SE or N-S compression and the western side sinking along the vertical plane. The latter type of earthquake occurrence is also observed for earthquakes beneath the middle part of Chiba Prefecture.", "subitem_description_type": "Abstract"}, {"subitem_description": 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Occurring in Clusters beneath the Kanto District", "item_titles": {"attribute_name": "\u30bf\u30a4\u30c8\u30eb", "attribute_value_mlt": [{"subitem_title": "Focal Mechanisms and  Spatial Distribution of Subcrustal Earthquakes Occurring in Clusters beneath the Kanto District", "subitem_title_language": "en"}]}, "item_type_id": "4", "owner": "1", "path": ["80/4535/4787/4793", "9/504/4538/4789/4794"], "permalink_uri": "https://doi.org/10.15083/0000032919", "pubdate": {"attribute_name": "PubDate", "attribute_value": "2008-05-30"}, "publish_date": "2008-05-30", "publish_status": "0", "recid": "32919", "relation": {}, "relation_version_is_last": true, "title": ["Focal Mechanisms and  Spatial Distribution of Subcrustal Earthquakes Occurring in Clusters beneath the Kanto District"], "weko_shared_id": -1}