{"_buckets": {"deposit": "35a2fb20-e9cf-4d00-8061-61ee3f1661be"}, "_deposit": {"id": "33802", "owner": "1", "owners": [], "pid": {"revision_id": 0, "type": "depid", "value": "33802"}, "status": "published"}, "_oai": {"id": "oai:repository.dl.itc.u-tokyo.ac.jp:00033802", "sets": []}, "author_link": ["131912", "131911"], "item_4_alternative_title_1": {"attribute_name": "\u305d\u306e\u4ed6\u306e\u30bf\u30a4\u30c8\u30eb", "attribute_value_mlt": [{"subitem_alternative_title": "23.\u897f\u5357\u592a\u5e73\u6d0b\u6d77\u57df\u3092,\u592b\u3005\u306e\u5185\u90e8\u3067\u30ec\u30fc\u30ea\u30fc\u6ce2\u304c\u540c\u4e00\u306e\u7fa4\u901f\u5ea6\u3092\u793a\u3059\u69d8\u306a\u3044\u304f\u3064\u304b\u306e\u5730\u533a\u306b\u5206\u3051\u308b\u3053\u3068"}]}, "item_4_biblio_info_7": {"attribute_name": "\u66f8\u8a8c\u60c5\u5831", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "1962-03-15", "bibliographicIssueDateType": "Issued"}, "bibliographicIssueNumber": "4", "bibliographicPageEnd": "630", "bibliographicPageStart": "603", "bibliographicVolumeNumber": "39", "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": "In the previous papers, the writer classified the dispersion curves of Rayleigh waves into seven kinds, and gave them the characteristic numbers from \"\"1\"\" to \"\"7\"\". These curves were revealed to be not independent of each other. For example, when Rayleigh waves pass across three differing regions with dispersion characteristic numbers \"\"1\"\", \"\"3\"\" and \"\"7\"\" with a pass length ratio of 3:3:4, the resultant dispersion character along the total path shows the character \"\"5\"\". Similar relations could be found also with the other curves (Fig. 3). Using these relations, a trial was made to divide the complicated oceanic area in the western side of the \"\"Andesite line\"\" into four regions \"\"1\"\" (purely oceanic type), \"\"3\"\" (sub-oceanic type), \"\"5\"\" (subcontinental type) and \"\"7\"\" (purely continental type). At first, the present oceanic area was divided into four regions by using the dispersion data obtained along thirty-two paths for Tsukuba Station (Fig. 4). Secondly, the same work was done by adding other dispersion data along thirteen paths for three stations, Hongkong, Honolulu and Suva (Fig. 11). In order to check the results, the group velocities of Rayleigh waves across these divided regions were calculated by least square method (Figs. 6, 12). The result showed that our division map was quite satisfactory. Judging from the division map obtained, it was recognized that the crustal structure in the western side of the \"\"Andesite line\"\" was certainly more continental than in the eastern side of it. In the sea region deeper than 4km, for instance, Rayleigh waves show the characteristic number \"\"1\"\" in the eastern side, while they show the sub-oceanic one \"\"3\"\" in the western side. The region in which Rayleigh waves show the dispersion characterized by type \"\"1\"\" is, in the western side of the \"\"Andesite line\"\", limitted to regions with a much greater ocean depth, the depth being greater than 6km. Rayleigh waves through the East China Sea or the Borneo Sea show the purely continental dispersion character \"\"7\"\". Only in the central part of the South China Sea or in small parts of the Celebes Sea, does the dispersion of Rayleigh waves show the sub-oceanic character \"\"3\"\". Four kinds of dispersion curves in the divided regions were compared with the theoretical ones, and it was found that the shift of the dispersion character from \"\"1\"\" to \"\"7\"\" could be explained by decreasing the compressional waves velocity in the crust from 6.9km/sec to 5.0km/sec and by increasing the thickness of the crust from 5km to 20km. 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Division of the South-western Pacific Area into Several Regions in each of which Rayleigh Waves Have the Same Dispersion Characters", "item_titles": {"attribute_name": "\u30bf\u30a4\u30c8\u30eb", "attribute_value_mlt": [{"subitem_title": "23. Division of the South-western Pacific Area into Several Regions in each of which Rayleigh Waves Have the Same Dispersion Characters", "subitem_title_language": "en"}]}, "item_type_id": "4", "owner": "1", "path": ["80/4535/4987/4988", "9/504/4538/4989/4990"], "permalink_uri": "https://doi.org/10.15083/0000033802", "pubdate": {"attribute_name": "PubDate", "attribute_value": "2008-05-30"}, "publish_date": "2008-05-30", "publish_status": "0", "recid": "33802", "relation": {}, "relation_version_is_last": true, "title": ["23. Division of the South-western Pacific Area into Several Regions in each of which Rayleigh Waves Have the Same Dispersion Characters"], "weko_shared_id": -1}