{"_buckets": {"deposit": "a01cd450-8cfa-4a4e-ad05-070263dd770c"}, "_deposit": {"id": "32999", "owner": "1", "owners": [], "pid": {"revision_id": 0, "type": "depid", "value": "32999"}, "status": "published"}, "_oai": {"id": "oai:repository.dl.itc.u-tokyo.ac.jp:00032999", "sets": []}, "author_link": ["128658", "128659", "128660", "128661", "128662", "128653", "128654", "128655", "128656", "128657"], "item_4_alternative_title_1": {"attribute_name": "\u305d\u306e\u4ed6\u306e\u30bf\u30a4\u30c8\u30eb", "attribute_value_mlt": [{"subitem_alternative_title": "OBS\u30a2\u30ec\u30fc\u89b3\u6e2c\u306b\u3088\u3063\u3066\u898b\u3064\u304b\u3063\u305f\u65e5\u672c\u6d77\u6e9d\u5916\u5074\u659c\u9762\u5730\u57df\u306b\u304a\u3051\u308b\u5e2f\u72b6\u9707\u592e\u5206\u5e03 : \u5e8f\u5831"}]}, "item_4_biblio_info_7": {"attribute_name": "\u66f8\u8a8c\u60c5\u5831", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "1982-07-16", "bibliographicIssueDateType": "Issued"}, "bibliographicIssueNumber": "1", "bibliographicPageEnd": "104", "bibliographicPageStart": "83", "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": "One month OBS array observation was carried out in the Japan Trench region using seven pop-up OBS\u0027s. Preliminary determination of hypocenters was made. The hypocenter distribution shows strong seismic activities in the outer slope region. There was a linear trend of epicenter distribution, roughly along the 6,000 m bathymetric contour. The focal depths of these earthquakes were shallow, less than 10 km. The graben-like structure in this region might have a strong correlation with this seismic activity. Some earthquakes, which form a cluster, occurred near the trench axis. There was another broad distribution of epicenters in the north of 40\u00b0N. In the inner slope region a swarm activity occurred which included four M=A events. The focal depths of them were shallow. Some distinct features on wave forms of OBS records are presented. One of the most significant features is the predominancy of low frequency component for some earthquakes, which occurred in the outer slope region and were recorded at the stations on the outer slope. There may be some similarities between the low frequency earthquakes and the \"\"slow earthquakes\"\", if the low frequency was generated by the source itself. Another new feature is the appearance of S-S multiple reflections which occurred within the sediment layer under the station.", "subitem_description_type": "Abstract"}, {"subitem_description": 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