{"_buckets": {"deposit": "5113a2f2-d00a-4ab5-9340-6719a6db87e5"}, "_deposit": {"id": "4680", "owners": [1], "pid": {"revision_id": 0, "type": "depid", "value": "4680"}, "status": "published"}, "_oai": {"id": "oai:nied-repo.bosai.go.jp:00004680", "sets": []}, "author_link": [], "item_10001_biblio_info_7": {"attribute_name": "書誌情報", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "2013", "bibliographicIssueDateType": "Issued"}, "bibliographicIssueNumber": "1", "bibliographicPageEnd": "251", "bibliographicPageStart": "238", "bibliographicVolumeNumber": "193", "bibliographic_titles": [{"bibliographic_title": "Geophysical Journal International", "bibliographic_titleLang": "ja"}, {"bibliographic_title": "Geophysical Journal International", "bibliographic_titleLang": "en"}]}]}, "item_10001_description_5": {"attribute_name": "抄録", "attribute_value_mlt": [{"subitem_description": "We detect time-lapse changes in P- and S-wave velocities (hereafter, V-P and V-S, respectively) and shear wave splitting parameters associated with the 2011 Tohoku earthquake, Japan, at depths between 0 and 504 m. We estimate not only medium parameters but also the 95 per cent confidence interval of the estimated velocity change by applying a new least squares inversion scheme to the deconvolution analysis of KiK-net vertical array records. Up to 6 per cent V-S reduction is observed at more than half of the analysed KiK-net stations in northeastern Japan with over 95 per cent confidence in the first month after the main shock. There is a considerable correlation between the S-wave traveltime delay and the maximum horizontal dynamic strain (MDS) by the main shock motion when the strain exceeds 5 x 10(-4) on the ground surface. This correlation is not clearly observed for MDS at the borehole bottom. On the contrary, V-P and shear wave splitting parameters do not show systematic changes after the Tohoku earthquake. These results indicate that the time-lapse change is concentrated near the ground surface, especially in loosely packed soil layers. We conclude that the behaviour of V-P, V-S and shear wave splitting parameters are explained by the generation of omnidirectional cracks near the ground surface and by the diffusion of water in the porous subsurface. Recovery of V-S should be related to healing of the crack which is proportional to the logarithm of the lapse time after the main shock and/or to decompaction after shaking.", "subitem_description_language": "en", "subitem_description_type": "Other"}]}, "item_10001_publisher_8": {"attribute_name": "出版者", "attribute_value_mlt": [{"subitem_publisher": "OXFORD UNIV PRESS", "subitem_publisher_language": "en"}]}, "item_10001_relation_14": {"attribute_name": "DOI", "attribute_value_mlt": [{"subitem_relation_type_id": {"subitem_relation_type_id_text": "10.1093/gji/ggs080"}}]}, "item_10001_source_id_9": {"attribute_name": "ISSN", "attribute_value_mlt": [{"subitem_source_identifier": "0956-540X", "subitem_source_identifier_type": "ISSN"}]}, "item_creator": {"attribute_name": "著者", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "SAWAZAKI Kaoru", "creatorNameLang": "ja"}, {"creatorName": "SAWAZAKI Kaoru", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "SAWAZAKI Kaoru", "creatorNameLang": "ja"}, {"creatorName": "SAWAZAKI Kaoru", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "SNIEDER Roel", "creatorNameLang": "ja"}, {"creatorName": "SNIEDER Roel", "creatorNameLang": "en"}]}]}, "item_language": {"attribute_name": "言語", "attribute_value_mlt": [{"subitem_language": "eng"}]}, "item_title": "Time-lapse changes of P- and S-wave velocities and shear wave splitting in the first year after the 2011 Tohoku earthquake, Japan: shallow subsurface", "item_titles": {"attribute_name": "タイトル", "attribute_value_mlt": [{"subitem_title": "Time-lapse changes of P- and S-wave velocities and shear wave splitting in the first year after the 2011 Tohoku earthquake, Japan: shallow subsurface", "subitem_title_language": "ja"}, {"subitem_title": "Time-lapse changes of P- and S-wave velocities and shear wave splitting in the first year after the 2011 Tohoku earthquake, Japan: shallow subsurface", "subitem_title_language": "en"}]}, "item_type_id": "40001", "owner": "1", "path": ["1670839190650"], "permalink_uri": "https://nied-repo.bosai.go.jp/records/4680", "pubdate": {"attribute_name": "PubDate", "attribute_value": "2023-03-30"}, "publish_date": "2023-03-30", "publish_status": "0", "recid": "4680", "relation": {}, "relation_version_is_last": true, "title": ["Time-lapse changes of P- and S-wave velocities and shear wave splitting in the first year after the 2011 Tohoku earthquake, Japan: shallow subsurface"], "weko_shared_id": -1}