{"_buckets": {"deposit": "9e6e8c07-2956-4357-bfc8-a8bbc6fa5047"}, "_deposit": {"id": "4537", "owners": [1], "pid": {"revision_id": 0, "type": "depid", "value": "4537"}, "status": "published"}, "_oai": {"id": "oai:nied-repo.bosai.go.jp:00004537", "sets": []}, "author_link": [], "item_10001_biblio_info_7": {"attribute_name": "書誌情報", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "2011-03-08", "bibliographicIssueDateType": "Issued"}, "bibliographicVolumeNumber": "116", "bibliographic_titles": [{"bibliographic_title": "JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH", "bibliographic_titleLang": "ja"}, {"bibliographic_title": "JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH", "bibliographic_titleLang": "en"}]}]}, "item_10001_description_5": {"attribute_name": "抄録", "attribute_value_mlt": [{"subitem_description": "Random inhomogeneity in the lithosphere scatters seismic waves at high frequencies (\u003e1 Hz). The accumulated scattering effect of S waves can be measured from the peak delay time, defined as the time lag from the S wave onset to the maximal amplitude arrival. This study estimated the spatial distribution of the power spectral density function (PSDF) of random velocity inhomogeneities in the northern Izu-Bonin arc by inversion analysis of the peak delay times assuming von Karman-type spectrum. Peak delay times were measured at plural frequency bands (4-8, 8-16, and 16-32 Hz) by using waveform data recorded by ocean bottom seismographs. The inversion result at 0-30 km depth shows strong inhomogeneities beneath the Quaternary volcanoes Aoga-shima, Sumisu-jima, and Tori-shima. At 30-70 km depth, strongly inhomogeneous regions were imaged beneath the Quaternary volcanoes and weak inhomogeneities were imaged on the fore-arc side. The PSDF beneath the Quaternary volcanoes was estimated as P(m) similar to 0.029 m(-3.7) km(3) at 0.5 \u003c m \u003c 50 km(-1), where m is the wave number (km(-1)). The PSDF on the fore-arc side is P(m) similar to 0.0023 m(-4.4) km(3). The spectral roll-off is significantly different between these two regions, indicating that differences in random inhomogeneities become pronounced at smaller spatial scales. Petrological studies of the Izu-Bonin Mariana arc have suggested that magma and restite transport occurs across the Moho. We speculate that small magma inclusions or restite may account for the strong inhomogeneities beneath the Quaternary volcanoes and that the stochastic characteristics of their spatial distribution have changed the spectral roll-off there.", "subitem_description_language": "en", "subitem_description_type": "Other"}]}, "item_10001_publisher_8": {"attribute_name": "出版者", "attribute_value_mlt": [{"subitem_publisher": "AMER GEOPHYSICAL UNION", "subitem_publisher_language": "en"}]}, "item_10001_relation_14": {"attribute_name": "DOI", "attribute_value_mlt": [{"subitem_relation_type_id": {"subitem_relation_type_id_text": "10.1029/2010JB007691"}}]}, "item_10001_source_id_9": {"attribute_name": "ISSN", "attribute_value_mlt": [{"subitem_source_identifier": "2169-9356", "subitem_source_identifier_type": "EISSN"}]}, "item_creator": {"attribute_name": "著者", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "Takahashi Tsutomu", "creatorNameLang": "ja"}, {"creatorName": "Takahashi Tsutomu", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "Obana Koichiro", "creatorNameLang": "ja"}, {"creatorName": "Obana Koichiro", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "Kodaira Shuichi", "creatorNameLang": "ja"}, {"creatorName": "Kodaira Shuichi", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "Suetsugu Daisuke", "creatorNameLang": "ja"}, {"creatorName": "Suetsugu Daisuke", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "Takahashi Narumi", "creatorNameLang": "ja"}, {"creatorName": "Takahashi Narumi", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "Kamiya Shin\u0027ichiro", "creatorNameLang": "ja"}, {"creatorName": "Kamiya Shin\u0027ichiro", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "Tamura Yoshihiko", "creatorNameLang": "ja"}, {"creatorName": "Tamura Yoshihiko", "creatorNameLang": "en"}]}]}, "item_language": {"attribute_name": "言語", "attribute_value_mlt": [{"subitem_language": "eng"}]}, "item_title": "Random inhomogeneities in the northern Izu-Bonin arc estimated by tomographic inversion of peak delay times of S wave seismograms", "item_titles": {"attribute_name": "タイトル", "attribute_value_mlt": [{"subitem_title": "Random inhomogeneities in the northern Izu-Bonin arc estimated by tomographic inversion of peak delay times of S wave seismograms", "subitem_title_language": "ja"}, {"subitem_title": "Random inhomogeneities in the northern Izu-Bonin arc estimated by tomographic inversion of peak delay times of S wave seismograms", "subitem_title_language": "en"}]}, "item_type_id": "40001", "owner": "1", "path": ["1670839190650"], "permalink_uri": "https://nied-repo.bosai.go.jp/records/4537", "pubdate": {"attribute_name": "PubDate", "attribute_value": "2023-03-30"}, "publish_date": "2023-03-30", "publish_status": "0", "recid": "4537", "relation": {}, "relation_version_is_last": true, "title": ["Random inhomogeneities in the northern Izu-Bonin arc estimated by tomographic inversion of peak delay times of S wave seismograms"], "weko_shared_id": -1}