{"_buckets": {"deposit": "2d1749ab-1356-4500-b024-46a84ff0e3e2"}, "_deposit": {"id": "5876", "owners": [1], "pid": {"revision_id": 0, "type": "depid", "value": "5876"}, "status": "published"}, "_oai": {"id": "oai:nied-repo.bosai.go.jp:00005876", "sets": []}, "author_link": [], "item_10001_biblio_info_7": {"attribute_name": "書誌情報", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "2010-07", "bibliographicIssueDateType": "Issued"}, "bibliographicIssueNumber": "5", "bibliographicPageEnd": "488", "bibliographicPageStart": "483", "bibliographicVolumeNumber": "62", "bibliographic_titles": [{"bibliographic_title": "Earth, Planets and Space", "bibliographic_titleLang": "en"}]}]}, "item_10001_description_5": {"attribute_name": "抄録", "attribute_value_mlt": [{"subitem_description": "We present a simple formula for analyzing factors that govern porosity of magma in dome-forming eruptions. The formula is based on a 1-dimensional steady conduit flow model with vertical gas escape, and provides the value of the porosity as a function of magma flow rate, magma properties (viscosity and permeability), and pressure. The porosity for a given pressure depends on two non-dimensional numbers epsilon and theta. The parameter epsilon represents the ratio of wall friction force to liquid-gas interaction force, and is proportional to the magma viscosity. The parameter theta represents the ratio of gravitational load to liquid-gas interaction force and is inversely proportional to the magma flow rate. Gas escape is promoted and porosity decreases with increasing epsilon or theta. From the possible ranges of epsilon and theta for typical magmatic conditions, it is inferred that the porosity is primarily determined by epsilon at the atmospheric pressure (near the surface), and by theta at higher pressures (in the subsurface region inside the conduit). The porosity near the surface approaches 0 owing to high magma viscosity regardless of the magnitude of the magma flow rate, whereas the subsurface porosity increases to more than 0.5 with increasing magma flow rate.", "subitem_description_language": "en", "subitem_description_type": "Other"}]}, "item_10001_publisher_8": {"attribute_name": "出版者", "attribute_value_mlt": [{"subitem_publisher": "SPRINGER HEIDELBERG", "subitem_publisher_language": "en"}]}, "item_10001_relation_14": {"attribute_name": "DOI", "attribute_value_mlt": [{"subitem_relation_type_id": {"subitem_relation_type_id_text": "10.5047/eps.2010.02.005"}}]}, "item_10001_source_id_9": {"attribute_name": "ISSN", "attribute_value_mlt": [{"subitem_source_identifier": "1880-5981", "subitem_source_identifier_type": "ISSN"}]}, "item_creator": {"attribute_name": "著者", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "T. Kozono", "creatorNameLang": "ja"}, {"creatorName": "T. Kozono", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "T. Koyaguchi", "creatorNameLang": "ja"}, {"creatorName": "T. Koyaguchi", "creatorNameLang": "en"}]}]}, "item_language": {"attribute_name": "言語", "attribute_value_mlt": [{"subitem_language": "eng"}]}, "item_title": "A simple formula for calculating porosity of magma in volcanic conduits during dome-forming eruptions", "item_titles": {"attribute_name": "タイトル", "attribute_value_mlt": [{"subitem_title": "A simple formula for calculating porosity of magma in volcanic conduits during dome-forming eruptions", "subitem_title_language": "ja"}, {"subitem_title": "A simple formula for calculating porosity of magma in volcanic conduits during dome-forming eruptions", "subitem_title_language": "en"}]}, "item_type_id": "40001", "owner": "1", "path": ["1670839190650"], "permalink_uri": "https://nied-repo.bosai.go.jp/records/5876", "pubdate": {"attribute_name": "PubDate", "attribute_value": "2023-04-27"}, "publish_date": "2023-04-27", "publish_status": "0", "recid": "5876", "relation": {}, "relation_version_is_last": true, "title": ["A simple formula for calculating porosity of magma in volcanic conduits during dome-forming eruptions"], "weko_shared_id": -1}