Seismic facies and distribution of submarine pyroclastic deposits originated from multiple large-scale eruptions of Kikai caldera
Satoshi ShimizuReina NakaokaNobukazu SeamaTomoko HanyuKeiko Suzuki‐KamataKoji KiyosugiKatsuya KanekoTetsuo MatsunoHikaru IwamaruTakeshi HanyuShunsuke AbeNobuyuki OkamotoYoshiyuki Tatsumi
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The Soufriere Hills volcano on Montserrat has become one of the closest monitored island arc volcanoes since the onset of the ongoing (1995 - present) eruptive phase, which is characterized by the growth and collapse of andesite lava domes resulting in voluminous pyroclastic flows. In 2010 we acquired the first three-dimensional (3D) seismic dataset covering the submarine deposits of these recent pyroclastic flows, which overlie the remnants of much larger debris avalanches. The 3D seismic data allow a detailed reconstruction of changes in emplacement direction and the concurrent trigger of secondary failure of large amounts of seafloor sediment during the emplacement of a debris avalanche. We show how 3D seismic attributes add important information regarding the internal structure of landslide deposits and the tectonic framework. In combination with repeated bathymetric surveys covering the island’s shelf during the progressing emplacement of submarine pyroclastic flows, we are able to show that the pyroclastic deposits from distinct volcanic events are still well preserved and there is no significant basal erosion during the emplacement of submarine pyroclastic deposits on volcanic substrate. The cumulative deposition of pyroclastic deposits accounts for a significant part of the volcanic edifice.
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Research Article| October 01, 2011 Large eruption-triggered ocean-island landslide at Tenerife: Onshore record and long-term effects on hazardous pyroclastic dispersal Pablo Dávila Harris; Pablo Dávila Harris * 1University of Leicester, Department of Geology, University Road, Leicester LE1 7RH, UK *Current address: Centro de Geociencias, Universidad Nacional Autónoma de México, Querétaro 76230, México; E-mail: pablodavilaharris@gmail.com. Search for other works by this author on: GSW Google Scholar Michael J. Branney; Michael J. Branney 1University of Leicester, Department of Geology, University Road, Leicester LE1 7RH, UK Search for other works by this author on: GSW Google Scholar Michael Storey Michael Storey 2Quaternary Dating Laboratory, Department of Environmental, Social and Spatial Change, Roskilde University, Roskilde, Universitetsvej 1, PO Box 260, 4000 Roskilde, Denmark Search for other works by this author on: GSW Google Scholar Author and Article Information Pablo Dávila Harris * 1University of Leicester, Department of Geology, University Road, Leicester LE1 7RH, UK Michael J. Branney 1University of Leicester, Department of Geology, University Road, Leicester LE1 7RH, UK Michael Storey 2Quaternary Dating Laboratory, Department of Environmental, Social and Spatial Change, Roskilde University, Roskilde, Universitetsvej 1, PO Box 260, 4000 Roskilde, Denmark *Current address: Centro de Geociencias, Universidad Nacional Autónoma de México, Querétaro 76230, México; E-mail: pablodavilaharris@gmail.com. Publisher: Geological Society of America Received: 14 Dec 2010 Revision Received: 12 May 2011 Accepted: 14 May 2011 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2011 Geological Society of America Geology (2011) 39 (10): 951–954. https://doi.org/10.1130/G31994.1 Article history Received: 14 Dec 2010 Revision Received: 12 May 2011 Accepted: 14 May 2011 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Pablo Dávila Harris, Michael J. Branney, Michael Storey; Large eruption-triggered ocean-island landslide at Tenerife: Onshore record and long-term effects on hazardous pyroclastic dispersal. Geology 2011;; 39 (10): 951–954. doi: https://doi.org/10.1130/G31994.1 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 An extensive debris-avalanche deposit has been discovered on Cañadas volcano, Tenerife (Canary Islands). The onshore component of the 733 ± 3 ka Abona landslide deposit exposes classic block facies and mixed facies across 90 km2. Three lines of evidence together show that the avalanche was triggered by an ignimbrite-forming explosive eruption: (1) the deposit is enclosed by phonolitic ignimbrites and is draped by a Plinian fallout layer, all within a single eruption unit; (2) it contains prismatic-jointed pumice blocks that were hot during landslide emplacement, indicated by chilled rims and breadcrust surfaces; (3) these blocks yield the same 40Ar/39Ar date as the associated ignimbrite and fall deposit. Landslide hummocks dammed surface water, forming ephemeral lakes perched on the volcano flank. Phonolite dome growth destabilized the southeast sector of a mid-Pleistocene Cañadas caldera wall, and created a major breach that affected the passage of destructive pyroclastic density currents on Tenerife for 0.5 m.y., showing that landslides can have enduring consequences for pyroclastic dispersal and hazards. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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