{"_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": []}, "author_link": ["129882", "129881"], "item_4_alternative_title_1": {"attribute_name": "\u305d\u306e\u4ed6\u306e\u30bf\u30a4\u30c8\u30eb", "attribute_value_mlt": [{"subitem_alternative_title": "56.\u4e2d\u898f\u6a21\u5730\u9707\u524d\u5f8c\u306e\u5730\u9707\u6d3b\u52d5\u306e\u5fae\u7d30\u69cb\u9020"}]}, "item_4_biblio_info_7": {"attribute_name": "\u66f8\u8a8c\u60c5\u5831", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "1971-01-30", "bibliographicIssueDateType": "Issued"}, "bibliographicIssueNumber": "6", "bibliographicPageEnd": "1067", "bibliographicPageStart": "1053", "bibliographicVolumeNumber": "48", "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": "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 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