Sustained blasts during large volcanic eruptions

Abstract

Research Article| October 01, 2000 Sustained blasts during large volcanic eruptions F. Legros; F. Legros 1Instituto Jaume Almera, Consejo Superior de Investigaciones Científicas, Lluís Solé i Sabarís s/n, 08028 Barcelona, Spain Search for other works by this author on: GSW Google Scholar K. Kelfoun K. Kelfoun 2Département des Sciences de la Terre, 5 rue Kessler, 63038 Clermont-Ferrand, France Search for other works by this author on: GSW Google Scholar Author and Article Information F. Legros 1Instituto Jaume Almera, Consejo Superior de Investigaciones Científicas, Lluís Solé i Sabarís s/n, 08028 Barcelona, Spain K. Kelfoun 2Département des Sciences de la Terre, 5 rue Kessler, 63038 Clermont-Ferrand, France Publisher: Geological Society of America Received: 02 Feb 2000 Revision Received: 10 Jul 2000 Accepted: 17 Jul 2000 First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2000) 28 (10): 895–898. https://doi.org/10.1130/0091-7613(2000)28<895:SBDLVE>2.0.CO;2 Article history Received: 02 Feb 2000 Revision Received: 10 Jul 2000 Accepted: 17 Jul 2000 First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation F. Legros, K. Kelfoun; Sustained blasts during large volcanic eruptions. Geology 2000;; 28 (10): 895–898. doi: https://doi.org/10.1130/0091-7613(2000)28<895:SBDLVE>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract We carried out numerical simulations to investigate magma ascent in wide conduits during large explosive eruptions. Wide conduits allow high discharge rates, low frictional pressure losses, and shallow levels of explosive fragmentation of the magma within the conduit. In contrast with the commonly modeled lower rate eruptions during which magma fragments inside the conduit at depth and feeds a vertical eruptive jet, we find that for sufficiently high discharge rates (>1010 kg ṁ s−1) the fragmentation level may rise up to the surface. Gas-rich, unfragmented magma reaches the surface at high pressure and feeds a sustained volcanic blast. Geologic evidence for very high discharge rate eruptions, wide conduits, and shock waves in large pyroclastic flows supports the occurrence of this type of explosive eruption. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.