{"created":"2023-03-31T01:56:35.001110+00:00","id":4563,"links":{},"metadata":{"_buckets":{"deposit":"2ba1b34a-82e4-4242-b6a7-9e48d9338173"},"_deposit":{"id":"4563","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"4563"},"status":"published"},"_oai":{"id":"oai:nied-repo.bosai.go.jp:00004563","sets":[]},"author_link":[],"item_10001_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2012-08","bibliographicIssueDateType":"Issued"},"bibliographicPageStart":"B08204","bibliographicVolumeNumber":"117","bibliographic_titles":[{"bibliographic_title":"Journal of Geophysical Research: Solid Earth","bibliographic_titleLang":"en"}]}]},"item_10001_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"We investigated the coupled effects of gas escape and crystallization on the dynamics of lava dome eruptions using a one-dimensional conduit flow model. The relationship between chamber pressure p(ch) and mass flow rate q for steady conduit flow commonly has a regime of negative differential resistance (i.e., dp(ch)/d(q) < 0), which causes a transition from lava dome to explosive eruption. Two positive-feedback mechanisms that result in negative differential resistance have been identified. First, effective magma viscosity decreases with increasing q because of a delay of crystallization, leading to reduced viscous wall friction (feedback 1). Second, magma porosity increases with increasing q because of less efficient gas escape, leading to reduced gravitational load (feedback 2). For high-phenocryst-content magma (volume fraction >0.5), feedback 1 is the main mechanism that forms negative differential resistance. In this case, the transition from lava dome to explosive eruption occurs when the magma supply rate exceeds a fixed critical value. For low-phenocryst-content magma (volume fraction <0.5), feedback 2 plays a key role so that the transition is controlled by the permeability of the surrounding rocks; the critical magma supply rate remarkably decreases with decreasing permeability. Transition due to feedback 2 is associated with a change in the chemical composition of volcanic gas, a drastic increase in magma porosity from nearly 0 to greater than 0.8, and overpressure at a shallower level, which can be detected from geochemical and geophysical field observations.","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":"10.1029/2012JB009343"}}]},"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":"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":"Effects of gas escape and crystallization on the complexity of conduit flow dynamics during lava dome eruptions","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Effects of gas escape and crystallization on the complexity of conduit flow dynamics during lava dome eruptions","subitem_title_language":"ja"},{"subitem_title":"Effects of gas escape and crystallization on the complexity of conduit flow dynamics during lava dome eruptions","subitem_title_language":"en"}]},"item_type_id":"40001","owner":"1","path":["1670839190650"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2023-04-27"},"publish_date":"2023-04-27","publish_status":"0","recid":"4563","relation_version_is_last":true,"title":["Effects of gas escape and crystallization on the complexity of conduit flow dynamics during lava dome eruptions"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-04-27T05:14:06.843324+00:00"}