{"_buckets": {"deposit": "3376f7e1-88ac-425d-9458-403dce8ba41c"}, "_deposit": {"id": "33413", "owner": "1", "owners": [], "pid": {"revision_id": 0, "type": "depid", "value": "33413"}, "status": "published"}, "_oai": {"id": "oai:repository.dl.itc.u-tokyo.ac.jp:00033413", "sets": []}, "author_link": ["130470", "130471", "130468", "130469"], "item_4_alternative_title_1": {"attribute_name": "\u305d\u306e\u4ed6\u306e\u30bf\u30a4\u30c8\u30eb", "attribute_value_mlt": [{"subitem_alternative_title": "50.\u9577\u5468\u671f\u8868\u9762\u6ce2\u306b\u3088\u308bIsland Arc\u69cb\u9020\u306e\u7814\u7a76"}]}, "item_4_biblio_info_7": {"attribute_name": "\u66f8\u8a8c\u60c5\u5831", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "1968-12-20", "bibliographicIssueDateType": "Issued"}, "bibliographicIssueNumber": "5", "bibliographicPageEnd": "1025", "bibliographicPageStart": "1001", "bibliographicVolumeNumber": "46", "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": "Group velocities of Rayleigh and Love waves have been measured for a period range 20 to 110 sec to study regional differences in deep island arc structure. Three-component long-period seismographs were used for the measurements. Two horizontal components, NS and EW, were transformed to transverse and radial components to facilitate a separation of Love and Rayleigh waves. Group velocities were determined on both time and frequency domains; band-pass filtering was used on the time domain, and the group delay time d\u03c6/d\u03c9(\u03c6: phase, \u03c9: angular frequency) was measured on the frequency domain. At the period of 100 sec, the group velocities of Love waves measured for earthquakes near the West Caroline Islands and the Banda Sea are 0.15 km/sec lower than those measured for an earthquake near the Aleutian Islands. A similar trend was found for Rayleigh waves; the velocity difference is 0.15 km/sec at 80 sec. A major portion of the propagation path from the West Caroline Islands and the Banda Sea is above, and on the continental side of, the deep seismic plane, while that from the Aleutian Islands is on the oceanic side. These suggest that the mantle structure is markedly different across the deep seismic plane; the shear velocity is 0.3 to 0.4 km/sec lower over a depth range 30 to 60 km on the continental side than on the oceanic side of the deep seismic plane. No appreciable difference from the normal continental dispersion was found for the path from Eurasia.|\u5802\u5e73\u5fae\u5c0f\u5730\u9707\u89b3\u6e2c\u6240\u306e3\u6210\u5206\u9577\u5468\u671f\u5730\u9707\u8a08\u3092\u7528\u3044,\u5cf6\u5f27\u306e\u6df1\u90e8\u69cb\u9020\u3092\u660e\u3089\u304b\u306b\u3059\u308b\u305f\u3081,\u5468\u671f20\u304b\u3089110\u79d2\u307e\u3067\u306eRayleigh\u6ce2\u3068Love\u6ce2\u306e\u7fa4\u901f\u5ea6\u3092\u6e2c\u5b9a\u3057\u305f.Rayleigh\u6ce2\u3068Love\u6ce2\u3092\u5206\u96e2\u3059\u308b\u305f\u3081\u306b\u6c34\u5e73\u6210\u5206\u3092\u6ce2\u306e\u4f1d\u5e61\u65b9\u5411\u3068\u305d\u308c\u306b\u76f4\u89d2\u306a\u65b9\u5411\u306b\u5206\u89e3\u3057\u305f.\u7fa4\u901f\u5ea6\u306fband-pass filter\u3068group delay time d\u03c6/d\u03c9\uff08\u03c6:\u4f4d\u76f8,\u03c9:\u89d2\u5468\u6ce2\u6570\uff09\u306e\u4e21\u65b9\u3092\u7528\u3044\u3066\u304d\u3081\u305f.  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