{"_buckets": {"deposit": "1b3c19dc-12b2-47ed-8f79-a4d2ba097ed7"}, "_deposit": {"id": "33061", "owner": "1", "owners": [], "pid": {"revision_id": 0, "type": "depid", "value": "33061"}, "status": "published"}, "_oai": {"id": "oai:repository.dl.itc.u-tokyo.ac.jp:00033061", "sets": []}, "author_link": ["128948", "128947"], "item_4_alternative_title_1": {"attribute_name": "\u305d\u306e\u4ed6\u306e\u30bf\u30a4\u30c8\u30eb", "attribute_value_mlt": [{"subitem_alternative_title": "\u6771\u4eac\u6e7e\u5317\u90e8\u306e\u7fa4\u767a\u5730\u9707\u6d3b\u52d5\u306b\u3064\u3044\u3066"}]}, "item_4_biblio_info_7": {"attribute_name": "\u66f8\u8a8c\u60c5\u5831", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "1981-03-07", "bibliographicIssueDateType": "Issued"}, "bibliographicIssueNumber": "3", "bibliographicPageEnd": "619", "bibliographicPageStart": "601", "bibliographicVolumeNumber": "55", "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": "An earthquake swarm sequence occurring in the northern Tokyo Bay during the period from July 11 to August 3, 1979, was studied on the basis of the waveform analysis. The sequence was monitored by the magnetic-tape recording system consisting of six stations distributed around the swarm area. The seismograms obtained at each station exhibit similar waveforms belonging to an earthquake family. The precise epicenters of the 16 earthquakes determined, using the detailed differences of S-P times, show a very small focal region of about 400 meters in dimension, including four groups where the locations between the events are separated by, at most, few ten meters. Within the focal regions, a SE-NW trend was observed with events apparently migrating up and then back down. The source spectra obtained from S waves at two stations show identical forms having similar corner frequency, and the linear dimension estimated from the corner frequency is constant with a value of about 200 meters for the earthquakes with magnitudes of 1.8 to 3.0. Considering the epicentral area and the source dimension, it is expected that the earthquake swarm occurred over the same fault as a repeated slipping, especially the events locate within few ten meters occurred as the earthquakes of a stick-slip type.", "subitem_description_type": "Abstract"}, {"subitem_description": 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