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Phreatomagmatic Eruptions of 2014 and 2015 in Kuchinoerabujima Volcano Triggered by a Shallow Intrusion of Magma
Journal of Natural Disaster Science, Volume 37,Number 2,2016,pp67-78 Phreatomagmatic eruptions of 2014 and 2015 in Kuchinoerabujima Volcano triggered by a shallow intrusion of magma Nobuo Geshi1, Masato Iguchi2, and Hiroshi Shinohara1 1 Geological Survey of Japan, AIST 2 Disaster Prevention Research Institute, Kyoto University, (Received:Sep 2, 2016 Accepted:Oct.28, 2016) Abstract The 2014 and 2015 eruptions of Kuchinoerabujima Volcano followed a ~15-year precursory activation of the hydrothermal system induced by a magma intrusion event. Continuous heat transfer from the degassing magma body heated the hydrothermal system and the increase of the fluid pressure in the hydrothermal system caused fracturing of the unstable edifice, inducing a phreatic explosion. The 2014 eruption occurred from two fissures that traced the eruption fissures formed in the 1931 eruption. The explosive eruption detonated the hydrothermally-altered materials and part of the intruding magma. The rise of fumarolic activities before the past two activities in 1931-35 and 1966-1980 also suggest activation of the hydrothermal system by magmatic intrusions prior to the eruption. The long-lasting precursory activities in Kuchinoerabujima suggest complex processes of the heat transfer from the magma to the hydrothermal system. Keywords: Kuchinoerabujima Volcano, phreatomagmatic eruption, hydrothermal system, magma intrusion 1. Introduction Phreatic eruptions are generally caused by the rapid extrusion of geothermal fluid from a hydrothermal system within a volcanic edifice (Barberi et al., 1992). Hydrothermal activities and phreatic eruptions are related to magmatic activities directly or indirectly, as the hydrothermal activities of a volcano are basically driven by heat from magma (Grapes et al., 1974). -
2020 Cruise Directory Directory 2020 Cruise 2020 Cruise Directory M 18 C B Y 80 −−−−−−−−−−−−−−− 17 −−−−−−−−−−−−−−−
2020 MAIN Cover Artwork.qxp_Layout 1 07/03/2019 16:16 Page 1 2020 Hebridean Princess Cruise Calendar SPRING page CONTENTS March 2nd A Taste of the Lower Clyde 4 nights 22 European River Cruises on board MS Royal Crown 6th Firth of Clyde Explorer 4 nights 24 10th Historic Houses and Castles of the Clyde 7 nights 26 The Hebridean difference 3 Private charters 17 17th Inlets and Islands of Argyll 7 nights 28 24th Highland and Island Discovery 7 nights 30 Genuinely fully-inclusive cruising 4-5 Belmond Royal Scotsman 17 31st Flavours of the Hebrides 7 nights 32 Discovering more with Scottish islands A-Z 18-21 Hebridean’s exceptional crew 6-7 April 7th Easter Explorer 7 nights 34 Cruise itineraries 22-97 Life on board 8-9 14th Springtime Surprise 7 nights 36 Cabins 98-107 21st Idyllic Outer Isles 7 nights 38 Dining and cuisine 10-11 28th Footloose through the Inner Sound 7 nights 40 Smooth start to your cruise 108-109 2020 Cruise DireCTOrY Going ashore 12-13 On board A-Z 111 May 5th Glorious Gardens of the West Coast 7 nights 42 Themed cruises 14 12th Western Isles Panorama 7 nights 44 Highlands and islands of scotland What you need to know 112 Enriching guest speakers 15 19th St Kilda and the Outer Isles 7 nights 46 Orkney, Northern ireland, isle of Man and Norway Cabin facilities 113 26th Western Isles Wildlife 7 nights 48 Knowledgeable guides 15 Deck plans 114 SuMMER Partnerships 16 June 2nd St Kilda & Scotland’s Remote Archipelagos 7 nights 50 9th Heart of the Hebrides 7 nights 52 16th Footloose to the Outer Isles 7 nights 54 HEBRIDEAN -
Data Structure
Data structure – Water The aim of this document is to provide a short and clear description of parameters (data items) that are to be reported in the data collection forms of the Global Monitoring Plan (GMP) data collection campaigns 2013–2014. The data itself should be reported by means of MS Excel sheets as suggested in the document UNEP/POPS/COP.6/INF/31, chapter 2.3, p. 22. Aggregated data can also be reported via on-line forms available in the GMP data warehouse (GMP DWH). Structure of the database and associated code lists are based on following documents, recommendations and expert opinions as adopted by the Stockholm Convention COP6 in 2013: · Guidance on the Global Monitoring Plan for Persistent Organic Pollutants UNEP/POPS/COP.6/INF/31 (version January 2013) · Conclusions of the Meeting of the Global Coordination Group and Regional Organization Groups for the Global Monitoring Plan for POPs, held in Geneva, 10–12 October 2012 · Conclusions of the Meeting of the expert group on data handling under the global monitoring plan for persistent organic pollutants, held in Brno, Czech Republic, 13-15 June 2012 The individual reported data component is inserted as: · free text or number (e.g. Site name, Monitoring programme, Value) · a defined item selected from a particular code list (e.g., Country, Chemical – group, Sampling). All code lists (i.e., allowed values for individual parameters) are enclosed in this document, either in a particular section (e.g., Region, Method) or listed separately in the annexes below (Country, Chemical – group, Parameter) for your reference. -
The Independent Volcanic Eruption Source Parameter Archive
Journal of Volcanology and Geothermal Research 417 (2021) 107295 Contents lists available at ScienceDirect Journal of Volcanology and Geothermal Research journal homepage: www.elsevier.com/locate/jvolgeores Invited Research Article The Independent Volcanic Eruption Source Parameter Archive (IVESPA, version 1.0): A new observational database to support explosive eruptive column model validation and development Thomas J. Aubry a,b,⁎,SamanthaEngwellc, Costanza Bonadonna d, Guillaume Carazzo e,SimonaScollof, Alexa R. Van Eaton g,IsabelleA.Taylorh,DavidJessope,i,j, Julia Eychenne j,MathieuGouhierj, Larry G. Mastin g, Kristi L. Wallace k, Sébastien Biass l, Marcus Bursik m, Roy G. Grainger h,A.MarkJellinekn, Anja Schmidt a,o a Department of Geography, University of Cambridge, Cambridge, UK b Sidney Sussex College, Cambridge, UK c British Geological Survey, The Lyell Centre, Edinburgh, UK d Department of Earth Sciences, University of Geneva, Geneva, Switzerland e Université de Paris, Institut de Physique du Globe de Paris, CNRS, F-75005 Paris, France f Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Etneo, Catania, Italy g U.S. Geological Survey, Cascades Volcano Observatory, Vancouver, Washington, USA h COMET, Atmospheric, Oceanic and Planetary Physics, University of Oxford, Oxford OX1 3PU, UK i Observatoire Volcanologique et Sismologique de Guadeloupe, Institut de Physique du Globe de Paris, F- 97113 Gourbeyre, France j Université Clermont Auvergne, CNRS, IRD, OPGC Laboratoire Magmas et Volcans, F-63000 Clermont-Ferrand, France -
Controls on Rhyolite Lava Dome Eruptions in the Taupo Volcanic Zone
Controls on rhyolite lava dome eruptions in the Taupo Volcanic Zone Paul Allan Ashwell A thesis submitted in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Geological Sciences at the University of Canterbury October 2013 P a g e | II Dedicated to Eva Ashwell P a g e | III View from Ruawahia, across the 1886AD fissure and Wahanga dome towards the Bay of Plenty and White Island (extreme distance, centre left) P a g e | IV Abstract he evolution of rhyolitic lava from effusion to cessation of activity is poorly understood. T Recent lava dome eruptions at Unzen, Colima, Chaiten and Soufrière Hills have vastly increased our knowledge on the changes in behaviour of active domes. However, in ancient domes, little knowledge of the evolution of individual extrusion events exists. Instead, internal structures and facies variations can be used to assess the mechanisms of eruption. Rhyolitic magma rising in a conduit vesiculates and undergoes shear, such that lava erupting at the surface will be a mix of glass and sheared vesicles that form a permeable network, and with or without phenocryst or microlites. This foam will undergo compression from overburden in the shallow conduit and lava dome, forcing the vesicles to close and affecting the permeable network. High temperature, uniaxial compression experiments on crystal-rich and crystal-poor lavas have quantified the evolution of porosity and permeability in such environments. The deformation mechanisms involved in uniaxial deformation are viscous deformation and cracking. Crack production is controlled by strain rate and crystallinity, as strain is localised in crystals in crystal rich lavas. -
Pyroclastic Deposits I: Pyroclastic Fall Deposits
Pyroclastic Deposits I: Pyroclastic Fall Deposits EAS 458 Volcanology Introduction . We have seen that physics is useful in understanding volcanic processes, but physical models must be constrained by and tested against observation. We have 1925 years of historic observations of Vesuvius (79 AD to present) . Far less for most other volcanoes . In all, a very, very small fraction of eruptions . Most descriptions are of limited use . Observations about volcanic processes must depend primarily on geologic observations . The geologic record of volcanic eruptions consists primarily of the deposits produced by them. 1 Pyroclastic Deposits . Three types of pyroclastic deposits . Fall Deposits . Fallout from an eruptive column . Flow Deposits . Produced by pyroclastic flows . Surge Deposits . Often associated with flow deposits . Associated with explosive events, such as phreatomagmatic explosions Pyroclastic Deposits . Characteristics . Fall Deposits . Mantle topography . Parallel bedding . Well sorted . Often graded . Flow Deposits . Topographically constrained . Poorly sorted . Often graded . Surge Deposits . Partially topographically constrained . Cross bedding characteristic . Intermediate sorting . Often graded 2 Pyroclastic Fall Deposits . General term: tephra . Types . Scoria (mafic , larger size) . Pumice (silicic, larger size) . Ash (fine grained) Fall Deposits: Bedding . Except very near vent, “fall” particles settle vertically. Therefore, extensive deposits (such as those of Plinian eruptions) will be equally thick at any given distance and direction from the vent. Hence, they mantle topography . (Scoria cones produced by Hawaiian and Strobolian eruptions obviously don’t mantle topography) 3 Fall Deposits: Sorting . The distance a particle will travel from the vent depends on: . Ejection velocity . Particle size . For conditions at any particular time and place, particles of a small range of sizes will fall out. -
HEBRIDEAN MARINE MAMMAL ATLAS Part 1: Silurian, 15 Years of Marine Mammal Monitoring in the Hebrides 2 CONTENTS CONTENTS 3
HEBRIDEAN MARINE MAMMAL ATLAS Part 1: Silurian, 15 years of marine mammal monitoring in the Hebrides 2 CONTENTS CONTENTS 3 CONTENTS 1 2 3 4 5 6 INTRODUCTION SILURIAN HEBRIDES SPECIES FUTURE CONTRIBUTORS 4 8 22 26 56 58 Foreword About our Extraordinary Harbour Porpoise On the Horizon Acknowledgements Research Vessel Biodiversity 5 29 59 About Us 10 Minke Whale References Survey Protocol 5 33 A Message from 14 Basking Shark our Patron Data Review 37 6 Short-Beaked About the Atlas Common Dolphin 40 Bottlenose Dolphin 43 White-Beaked Dolphin 46 Risso’s Dolphin 49 Killer Whale (Orca) 53 Humpback Whale Suggested citation; Hebridean Whale and Dolphin Trust (2018). Hebridean Marine Mammal Atlas. Part 1: Silurian, 15 years of marine mammal monitoring in the Hebrides. A Hebridean Whale and Dolphin Trust Report (HWDT), Scotland, UK. 60 pp. Compiled by Dr Lauren Hartny-Mills, Science and Policy Manager, Hebridean Whale and Dolphin Trust 4 CONTENTS INTRODUCTION 5 FOREWORD INTRODUCTION About Us Established in 1994, the Hebridean Whale and Dolphin Based on the Isle of Mull, in the heart of the Trust (HWDT) is the trusted voice and leading source of Hebrides, HWDT is a registered charity that information for the conservation of Hebridean whales, has pioneered practical, locally based education dolphins and porpoises (cetaceans). and scientifically rigorous long-term monitoring programmes on cetaceans in the Hebrides. The Hebridean Marine Mammal Atlas is a showcase of We believe that evidence is the foundation of effective 15 years of citizen science and species monitoring in the conservation. Our research has critically advanced Hebrides. -
Deep Structure of the Foreland to the Caledonian Orogen, Nw Scotland: Results of the Birps Winch Profile
TECTONICS, VOL. 5, NO. 2, PAGES 171-194, APRIL 1986 DEEP STRUCTURE OF THE FORELAND TO THE CALEDONIAN OROGEN, NW SCOTLAND: RESULTS OF THE BIRPS WINCH PROFILE Jonathan A. Brewer Department of Earth Sciences, University of Cambridge, Cambridge, United Kingdom David K. Smythe British Geological Survey, Edinburgh, United Kingdom Abstract. The WINCH marine deep tal velocity for the Hebridean shelf of seismic reflection profile crosses the 6.4+0.1 km s-1. The eastward-dipping Fla- Hebridean shelf, the Proterozoic foreland nnan Thrust can be mapped into the upper to the Caledonian orogen, west of Scot- mantle on three lines from about 15 to land. The data quality is very good. The 45 km depth, well into the upper mantle. upper crust is largely devoid of coherent Neither the Flannan Thrust nor the Outer seismic reflections, although this may in Isles Thrust appear to pass straight thro- part be due to acquisition techniques ugh the reflective lower crust, suggesting being inappropriate for this problem. In that the lower crust is a region of high contrast, the middle and lower crust (10- strain. The Outer Hebrides is a positive 25 km depth) exhibits good reflections; block probably formed as an isostatic the mid crust contains reflectors which response to Mesozoic normal faulting which may be relics of early Palaeozoic, Caledo- reactivated the Outer Isles Thrust. nian (or earlier Grenvillian) eastward- INTRODUCTION dipping thrust zones, which pass into an acoustically strongly layered lower crust. The Western Isles-North Channel (WINCH) The Outer Isles Thrust is mapped from the surf ace to the mid crust, and tied into deep crustal seismic reflection profile was recorded for BIRPS (British Institut- its land outcrop on north Lewis. -
Evidence for the Relative Depths and Energies of Phreatomagmatic Explosions Recorded in Tephra Rings
Bulletin of Volcanology (2017) 79: 88 https://doi.org/10.1007/s00445-017-1177-x RESEARCH ARTICLE Evidence for the relative depths and energies of phreatomagmatic explosions recorded in tephra rings Alison H. Graettinger1 & Greg A. Valentine2 Received: 17 April 2017 /Accepted: 15 November 2017 /Published online: 28 November 2017 # The Author(s) 2017. This article is an open access publication Abstract Experimental work and field observations have inspired the revision of conceptual models of how maar-diatreme eruptions progress and the effects of variable energy, depth, and lateral position of explosions during an eruption sequence. This study reevaluates natural tephra ring deposits to test these new models against the depositional record. Two incised tephra rings in the Hopi Buttes Volcanic Field are revisited, and published tephra ring stratigraphic studies are compared to identify trends within tephra rings. Five major facies were recognized and interpreted as the result of different transportation and depositional processes and found to be common at these volcanoes. Tephra rings often contain evidence of repeated discrete phreatomagmatic explo- sions in the form of couplets of two facies: (1) massive lapilli tuffs and tuff breccias and (2) overlying thinly stratified to cross- stratified tuffs and lapilli tuffs. The occurrence of repeating layers of either facies and the occurrence of couplets are used to interpret major trends in the relative depth of phreatomagmatic explosions that contribute to these eruptions. For deposits related to near-optimal scaled depth explosions, estimates of the mass of ejected material and initial ejection velocity can be used to approximate the explosion energy. The 19 stratigraphic sections compared indicate that near-optimal scaled depth explosions are common and that the explosion locations can migrate both upward and downward during an eruption, suggesting a complex interplay between water availability and magma flux. -
The Geochemical Associations of Metals and Organic
THE GEOCHEMICAL ASSOCIATIONS OF METALS AND ORGANIC MATTER IN WEST COAST SCOTTISH SEDIMENTS. by DAVID ODONNELL B.Sc. A Thesis Submitted For The Degree Of DOCTOR OF PHILOSOPHY At The University Of Edinburgh. December 1987. To My Father Terry O'Donnell Science, beauty, freedom, adventure, what more could you ask for in life?" Charles A Lindberg ABSTRACT. Thirteen sediment cores have been collected from a variety of sedimentary environments around the coast of Western Scotland ranging from terrestrially dominated fjords to more marine shelf areas. Eight of these cores have been examined in detail for the minor elements (Cu, Pb, Zn, Zr, Rb, Sc, Sr, Ba, Ni, Cr, Y), Rare Earth elements (La, Ce, Nd), organic components (C, N, S. I, Br,) and porewater components (S042 , alkalinity). In addition, some cores were analysed for 615N and also 137Cs (to estimate sediment accumulation rates). Study of the minor elements associated with the lithogenic fraction (Zr, Rb, Sc, Sr, Ba, Ni, Cr) has highlighted variations in sediment mineralogy and grain-size both spatially and temporally, showing that few of the sediments show steady state accumulation. Indeed, in one core an erosive event can be identified which has been calculated to have removed 18cm of sediment accumulation. In these sediments Ni and Cr have been shown to be associated with the detrital ferromagnesian fraction. Ni can therefore be used as an indicator of Iithogenic metal input. The distibution of the REE (La, Ce, Nd) show enrichments of La and Ce relative to V and mean shales in the more terrestrially dominated fjords suggesting a possible association with the iron oxide phase. -
Eruption Dynamics of Magmatic/Phreatomagmatic Eruptions of Low-Viscosity Phonolitic Magmas: Case of the Laacher See Eruption (Eifel, Germany)
FACULTEIT WETENSCHAPPEN Opleiding Master in de Geologie Eruption dynamics of magmatic/phreatomagmatic eruptions of low-viscosity phonolitic magmas: Case of the Laacher See eruption (Eifel, Germany) Gert-Jan Peeters Academiejaar 2011–2012 Scriptie voorgelegd tot het behalen van de graad Van Master in de Geologie Promotor: Prof. Dr. V. Cnudde Co-promotor: Dr. K. Fontijn, Dr. G. Ernst Leescommissie: Prof. Dr. P. Vandenhaute, Prof. Dr. M. Kervyn Foreword There are a few people who I would like to thank for their efforts in helping me conduct the research necessary to write this thesis. Firstly, I would specially like to thank my co-promotor Dr. Karen Fontijn for all the time she put into this thesis which is a lot. Even though she was abroad most of the year, she was always there to help me and give me her opinion/advice whether by e-mail or by Skype and whether it was in the early morning or at midnight. Over the past three years, I learned a lot from her about volcanology and conducting research in general going from how volcanic deposits look on the field and how to sample them to how to measure accurately and systematically in the laboratory to ultimately how to write scientifically. I would also like to thank my promoter Prof. Dr. Veerle Cnudde for giving me the opportunity to do my thesis about volcanology even though it is not in her area of expertise and the opportunity to use the µCT multiple times. I thank the entire UGCT especially Wesley De Boever, Tim De Kock, Marijn Boone and Jan Dewanckele for helping me with preparing thin sections, drilling subsamples, explaining how Morpho+ works, solving problems when Morpho+ decided to crash etc. -
Insights Into the Recurrent Energetic Eruptions That Drive Awu Among the Deadliest Volcanoes on Earth
Insights into the recurrent energetic eruptions that drive Awu among the deadliest volcanoes on earth Philipson Bani1, Kristianto2, Syegi Kunrat2, Devy Kamil Syahbana2 5 1- Laboratoire Magmas et Volcans, Université Blaise Pascal - CNRS -IRD, OPGC, Aubière, France. 2- Center for Volcanology and Geological Hazard Mitigation (CVGHM), Jl. Diponegoro No. 57, Bandung, Indonesia Correspondence to: Philipson Bani ([email protected]) 10 Abstract The little known Awu volcano (Sangihe island, Indonesia) is among the deadliest with a cumulative death toll of 11048. In less than 4 centuries, 18 eruptions were recorded, including two VEI-4 and three VEI-3 eruptions with worldwide impacts. The regional geodynamic setting is controlled by a divergent-double-subduction and an arc-arc collision. In that context, the slab stalls in the mantle, undergoes an increase of temperature and becomes prone to 15 melting, a process that sustained the magmatic supply. Awu also has the particularity to host alternatively and simultaneously a lava dome and a crater lake throughout its activity. The lava dome passively erupted through the crater lake and induced strong water evaporation from the crater. A conduit plug associated with this dome emplacement subsequently channeled the gas emission to the crater wall. However, with the lava dome cooling, the high annual rainfall eventually reconstituted the crater lake and created a hazardous situation on Awu. Indeed with a new magma 20 injection, rapid pressure buildup may pulverize the conduit plug and the lava dome, allowing lake water injection and subsequent explosive water-magma interaction. The past vigorous eruptions are likely induced by these phenomena, a possible scenario for the future events.