{"_buckets": {"deposit": "19308164-4695-4783-a5a7-8aa3b587b146"}, "_deposit": {"id": "4307", "owners": [1], "pid": {"revision_id": 0, "type": "depid", "value": "4307"}, "status": "published"}, "_oai": {"id": "oai:nied-repo.bosai.go.jp:00004307", "sets": []}, "author_link": [], "item_10001_biblio_info_7": {"attribute_name": "書誌情報", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "2008-07-30"}, "bibliographicIssueNumber": "1-2", "bibliographicPageEnd": "90", "bibliographicPageStart": "82", "bibliographicVolumeNumber": "175", "bibliographic_titles": [{"bibliographic_title": "Journal of Volcanology and Geothermal Research", "bibliographic_titleLang": "en"}]}]}, "item_10001_description_5": {"attribute_name": "抄録", "attribute_value_mlt": [{"subitem_description": "Permeability measurement was made on five rock samples from USDP-4 cores. Rock samples were collected from the conduit zone and its country rock. One sample (C14-1-1) is considered as a part of the feeder dyke for the 1991-1995 eruption. The transient pulse method was employed under confining pressure up to 50 MPa. Compressional wave velocity was measured along with permeability. The measured permeability ranges from 10- 19 to 10- 17 m2 at the atmospheric pressure, and is as low as that reported for tight rocks such as granite. The permeability decreases with increasing confining pressure, while the compressional wave velocity increases. Assuming that pores are parallel elliptical tubes, the pressure dependence of permeability requires aspect ratio of 10- 4-10- 2 at the atmospheric pressure. The pore aperture is estimated to be less than 1 μm. The estimated aspect ratio and pore aperture suggest that connectivity of pores is maintained by narrow cracks. The existence of cracks is supported by the pressure dependence of compressional wave velocity. Narrow cracks (\u003c 1 μm) are observed in dyke samples, and they must have been created after solidification. Dyke samples do not provide us information of pore structures during degassing, since exsolved gas has mostly escaped and pores governing the gas permeable flow should have been lost. Both dyke and country rock samples provide us information of materials around ascending magma. Although the measured small-scale permeability cannot be directly applied to geological-scale processes, it gives constrains on studies of large-scale permeability. © 2008 Elsevier B.V. All rights reserved.", "subitem_description_language": "en", "subitem_description_type": "Other"}]}, "item_10001_relation_14": {"attribute_name": "DOI", "attribute_value_mlt": [{"subitem_relation_type_id": {"subitem_relation_type_id_text": "10.1016/j.jvolgeores.2008.03.021"}}]}, "item_10001_source_id_9": {"attribute_name": "ISSN", "attribute_value_mlt": [{"subitem_source_identifier": "0377-0273", "subitem_source_identifier_type": "ISSN"}]}, "item_creator": {"attribute_name": "著者", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "Tohru Watanabe", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "Yuhta Shimizu", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "Satoshi Noguchi", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "Setsuya Nakada", "creatorNameLang": "en"}]}]}, "item_title": "Permeability measurements on rock samples from Unzen Scientific Drilling Project Drill Hole 4 (USDP-4)", "item_titles": {"attribute_name": "タイトル", "attribute_value_mlt": [{"subitem_title": "Permeability measurements on rock samples from Unzen Scientific Drilling Project Drill Hole 4 (USDP-4)", "subitem_title_language": "en"}]}, "item_type_id": "40001", "owner": "1", "path": ["1670839190650"], "permalink_uri": "https://nied-repo.bosai.go.jp/records/4307", "pubdate": {"attribute_name": "PubDate", "attribute_value": "2023-03-30"}, "publish_date": "2023-03-30", "publish_status": "0", "recid": "4307", "relation": {}, "relation_version_is_last": true, "title": ["Permeability measurements on rock samples from Unzen Scientific Drilling Project Drill Hole 4 (USDP-4)"], "weko_shared_id": -1}