{"_buckets": {"deposit": "e9ea72ca-b22e-4527-937a-e45387f7a265"}, "_deposit": {"id": "32988", "owner": "1", "owners": [], "pid": {"revision_id": 0, "type": "depid", "value": "32988"}, "status": "published"}, "_oai": {"id": "oai:repository.dl.itc.u-tokyo.ac.jp:00032988", "sets": []}, "author_link": ["128618", "128617"], "item_4_alternative_title_1": {"attribute_name": "\u305d\u306e\u4ed6\u306e\u30bf\u30a4\u30c8\u30eb", "attribute_value_mlt": [{"subitem_alternative_title": "\u5730\u9707\u30e1\u30ab\u30cb\u30ba\u30e0\u306e\u6570\u5024\u89e3\u6790"}]}, "item_4_biblio_info_7": {"attribute_name": "\u66f8\u8a8c\u60c5\u5831", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "1982-09-30", "bibliographicIssueDateType": "Issued"}, "bibliographicIssueNumber": "2", "bibliographicPageEnd": "219", "bibliographicPageStart": "193", "bibliographicVolumeNumber": "57", "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": "A numerical method for determining fault-plane solutions and estimating confidence regions from P-wave first motion data was studied. Coverage of first motion data on the focal sphere influences fault-plane solution in the conventional methods, especially in graphical methods. There are sometimes inconsistent directions of first motion which are opposite to adjacent ones though located within common areas of most directions. In the new numerical method such inconsistent first motion data are discarded in an automatic and objective way, and the confidence regions of alternative solutions of the maximum pressure (P) and (T) with scores of 95% or greater are estimated. The new method was applied to 358 earthquakes which occurred in and around the Kanto region, Central Japan. Fault-plane solutions and their confidence regions with the scores of 95% or greater could be obtained for 294 earthquakes (84%) in the first run. For the remaining earthquakes, the preliminary discarding of inconsistent first motion data made it possible to determine the fault-plane solutions. Significant differences of the fault-plane solutions were observed between the best fit solutions in previous methods and those by the new method. Equally probable fault-plane solutions for the same earthquake are sometimes separated into several groups and are also observed in a wide range on the focal sphere.", "subitem_description_type": "Abstract"}, {"subitem_description": 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