Constraints on Rheology of Obsidian Lavas Based on Mesoscopic Folds
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Characterization of Volcanic Deposits with Ground-Penetrating Radar
Bull Volcanol (1997) 58:515–527 Q Springer-Verlag 1997 ORIGINAL PAPER J. K. Russell 7 M. V. Stasiuk Characterization of volcanic deposits with ground-penetrating radar Received: 10 May 1996 / Accepted: 27 December 1996 Abstract Field-based studies of surficial volcanic de- Key words Ground-penetrating radar 7 Volcanic posits are commonly complicated by a combination of deposits 7 Stratigraphy 7 Dielectric constant 7 Radar poor exposure and rapid lateral variations controlled velocity 7 Pyroclastic flow 7 Airfall 7 Lava by unknown paleotopography. The potential of ground-penetrating radar (GPR) as an aid to volcano- logical studies is shown using data collected from trav- erses over four well-exposed, Recent volcanic deposits Introduction in western Canada. The deposits comprise a pumice airfall deposit (3–4 m thick), a basalt lava flow (3–6 m Studies of surficial volcanic deposits are commonly lim- thick), a pyroclastic flow deposit (15 m thick), and an ited by incomplete exposure. Estimates of the physical internally stratified pumice talus deposit (60 m thick). properties, distributions, thicknesses, and internal Results show that GPR is effective in delineating major structures of the deposits are usually derived from stud- stratigraphic contacts and hence can be used to map ies on a few well-dissected outcrops. Ground-penetrat- unexposed deposits. Different volcanic deposits also ing radar (GPR) is a portable geophysical technique exhibit different radar stratigraphic character, suggest- which can provide ancillary information on the unex- ing that deposit type may be determined from radar posed parts of deposits, thereby facilitating many volca- images. In addition, large blocks within the pyroclastic nological studies. -
Appendix a Conceptual Geologic Model
Newberry Geothermal Energy Establishment of the Frontier Observatory for Research in Geothermal Energy (FORGE) at Newberry Volcano, Oregon Appendix A Conceptual Geologic Model April 27, 2016 Contents A.1 Summary ........................................................................................................................................... A.1 A.2 Geological and Geophysical Context of the Western Flank of Newberry Volcano ......................... A.2 A.2.1 Data Sources ...................................................................................................................... A.2 A.2.2 Geography .......................................................................................................................... A.3 A.2.3 Regional Setting ................................................................................................................. A.4 A.2.4 Regional Stress Orientation .............................................................................................. A.10 A.2.5 Faulting Expressions ........................................................................................................ A.11 A.2.6 Geomorphology ............................................................................................................... A.12 A.2.7 Regional Hydrology ......................................................................................................... A.20 A.2.8 Natural Seismicity ........................................................................................................... -
Anatomy of a Volcanic Eruption: Case Study: Mt. St. Helens
Anatomy of a Volcanic Eruption: Case Study: Mt. St. Helens Materials Included in this Box: • Teacher Background Information • 3-D models of Mt. St. Helens (before and after eruption) • Examples of stratovolcano rock products: Tuff (pyroclastic flow), pumice, rhyolite/dacite, ash • Sandbox crater formation exercise • Laminated photos/diagrams Teacher Background There are several shapes and types of volcanoes around the world. Some volcanoes occur on the edges of tectonic plates, such as those along the ‘ring of fire’. But there are also volcanoes that occur in the middle of tectonic plates like the Yellowstone volcano and Kilauea volcano in Hawaii. When asked to draw a volcano most people will draw a steeply sided, conical mountain that has a depression (crater) at the top. This image of a 'typical' volcano is called a stratovolcano (a.k.a. composite volcano). While this is the often visualized image of a volcano, there are actually many different shapes volcanoes can be. A volcano's shape is mostly determined by the type of magma/lava that is created underneath it. Stratovolcanoes get their shape because of the thick, sticky (viscous) magma that forms at subduction zones. This magma/lava is layered between ash, pumice, and rock fragments. These layers of ash and magma will build into high elevation, steeply sided, conical shaped mountains and form a 'typical' volcano shape. Stratovolcanoes are also known for their explosive and destructive eruptions. Eruptions can cause clouds of gas, ash, dust, and rock fragments to eject into the atmosphere. These clouds of ash can become so dense and heavy that they quickly fall down the side of the volcanoes as a pyroclastic flow. -
Properties of Volcanic Ash and Pumice Concrete
Properties of volcanic ash and pumice concrete Autor(en): Hossain, Khandaker M.A. Objekttyp: Article Zeitschrift: IABSE reports = Rapports AIPC = IVBH Berichte Band (Jahr): 81 (1999) PDF erstellt am: 27.09.2021 Persistenter Link: http://doi.org/10.5169/seals-61426 Nutzungsbedingungen Die ETH-Bibliothek ist Anbieterin der digitalisierten Zeitschriften. Sie besitzt keine Urheberrechte an den Inhalten der Zeitschriften. Die Rechte liegen in der Regel bei den Herausgebern. Die auf der Plattform e-periodica veröffentlichten Dokumente stehen für nicht-kommerzielle Zwecke in Lehre und Forschung sowie für die private Nutzung frei zur Verfügung. Einzelne Dateien oder Ausdrucke aus diesem Angebot können zusammen mit diesen Nutzungsbedingungen und den korrekten Herkunftsbezeichnungen weitergegeben werden. Das Veröffentlichen von Bildern in Print- und Online-Publikationen ist nur mit vorheriger Genehmigung der Rechteinhaber erlaubt. Die systematische Speicherung von Teilen des elektronischen Angebots auf anderen Servern bedarf ebenfalls des schriftlichen Einverständnisses der Rechteinhaber. Haftungsausschluss Alle Angaben erfolgen ohne Gewähr für Vollständigkeit oder Richtigkeit. Es wird keine Haftung übernommen für Schäden durch die Verwendung von Informationen aus diesem Online-Angebot oder durch das Fehlen von Informationen. Dies gilt auch für Inhalte Dritter, die über dieses Angebot zugänglich sind. Ein Dienst der ETH-Bibliothek ETH Zürich, Rämistrasse 101, 8092 Zürich, Schweiz, www.library.ethz.ch http://www.e-periodica.ch 145 IABSE COLLOQUIUM PHUKET 1999 \ Properties of Volcanic Ash and Pumice Concrete Khandaker M. A. HOSSAIN Khandaker M. A. Hossain, born in 1963, Lecturer in Civil Engineering received BSc and MSc in civil engineering from Bangladesh University of Engineering The PNG University of Technology & Technology, Dhaka and PhD from Lae, Papua New Guinea Strathclyde University, Glasgow, UK. -
Review of Local and Global Impacts of Volcanic Eruptions and Disaster Management Practices: the Indonesian Example
geosciences Review Review of Local and Global Impacts of Volcanic Eruptions and Disaster Management Practices: The Indonesian Example Mukhamad N. Malawani 1,2, Franck Lavigne 1,3,* , Christopher Gomez 2,4 , Bachtiar W. Mutaqin 2 and Danang S. Hadmoko 2 1 Laboratoire de Géographie Physique, Université Paris 1 Panthéon-Sorbonne, UMR 8591, 92195 Meudon, France; [email protected] 2 Disaster and Risk Management Research Group, Faculty of Geography, Universitas Gadjah Mada, Yogyakarta 55281, Indonesia; [email protected] (C.G.); [email protected] (B.W.M.); [email protected] (D.S.H.) 3 Institut Universitaire de France, 75005 Paris, France 4 Laboratory of Sediment Hazards and Disaster Risk, Kobe University, Kobe City 658-0022, Japan * Correspondence: [email protected] Abstract: This paper discusses the relations between the impacts of volcanic eruptions at multiple- scales and the related-issues of disaster-risk reduction (DRR). The review is structured around local and global impacts of volcanic eruptions, which have not been widely discussed in the literature, in terms of DRR issues. We classify the impacts at local scale on four different geographical features: impacts on the drainage system, on the structural morphology, on the water bodies, and the impact Citation: Malawani, M.N.; on societies and the environment. It has been demonstrated that information on local impacts can Lavigne, F.; Gomez, C.; be integrated into four phases of the DRR, i.e., monitoring, mapping, emergency, and recovery. In Mutaqin, B.W.; Hadmoko, D.S. contrast, information on the global impacts (e.g., global disruption on climate and air traffic) only fits Review of Local and Global Impacts the first DRR phase. -
Pumice Data Sheet
128 PUMICE AND PUMICITE (Data in thousand metric tons unless otherwise noted) Domestic Production and Use: In 2019, 10 operations in five States produced pumice and pumicite. Estimated production1 was 510,000 tons with an estimated processed value of about $17 million, free on board (f.o.b.) plant. Pumice and pumicite were mined in California, Oregon, Idaho, New Mexico, and Kansas, in descending order of production. The porous, lightweight properties of pumice are well suited for its main uses. Mined pumice was used in the production of abrasives, concrete admixtures and aggregates, lightweight building blocks, horticultural purposes, and other uses, including absorbent, filtration, laundry stone washing, and road use. Salient Statistics—United States: 2015 2016 2017 2018 2019e Production, mine1 310 374 383 496 510 Imports for consumption 64 170 166 159 110 Exportse 11 9 11 11 12 Consumption, apparent2 363 535 538 644 610 Price, average value, dollars per ton, f.o.b. mine or mill 33 38 39 32 33 Employment, mine and mill, number 140 140 140 140 140 Net import reliance3 as a percentage of apparent consumption 15 30 29 23 17 Recycling: Little to no known recycling. Import Sources (2015–18): Greece, 93%; Iceland, 5%; and Mexico, 2%. Tariff: Item Number Normal Trade Relations 12–31–19 Pumice, crude or in irregular pieces, including crushed 2513.10.0010 Free. Pumice, other 2513.10.0080 Free. Depletion Allowance: 5% (Domestic and foreign). Government Stockpile: None. Events, Trends, and Issues: The amount of domestically produced pumice and pumicite sold or used in 2019 was estimated to be 3% more than that in 2018. -
The Science Behind Volcanoes
The Science Behind Volcanoes A volcano is an opening, or rupture, in a planet's surface or crust, which allows hot magma, volcanic ash and gases to escape from the magma chamber below the surface. Volcanoes are generally found where tectonic plates are diverging or converging. A mid-oceanic ridge, for example the Mid-Atlantic Ridge, has examples of volcanoes caused by divergent tectonic plates pulling apart; the Pacific Ring of Fire has examples of volcanoes caused by convergent tectonic plates coming together. By contrast, volcanoes are usually not created where two tectonic plates slide past one another. Volcanoes can also form where there is stretching and thinning of the Earth's crust in the interiors of plates, e.g., in the East African Rift, the Wells Gray-Clearwater volcanic field and the Rio Grande Rift in North America. This type of volcanism falls under the umbrella of "Plate hypothesis" volcanism. Volcanism away from plate boundaries has also been explained as mantle plumes. These so- called "hotspots", for example Hawaii, are postulated to arise from upwelling diapirs with magma from the core–mantle boundary, 3,000 km deep in the Earth. Erupting volcanoes can pose many hazards, not only in the immediate vicinity of the eruption. Volcanic ash can be a threat to aircraft, in particular those with jet engines where ash particles can be melted by the high operating temperature. Large eruptions can affect temperature as ash and droplets of sulfuric acid obscure the sun and cool the Earth's lower atmosphere or troposphere; however, they also absorb heat radiated up from the Earth, thereby warming the stratosphere. -
Compositional Zoning of the Bishop Tuff
JOURNAL OF PETROLOGY VOLUME 48 NUMBER 5 PAGES 951^999 2007 doi:10.1093/petrology/egm007 Compositional Zoning of the Bishop Tuff WES HILDRETH1* AND COLIN J. N. WILSON2 1US GEOLOGICAL SURVEY, MS-910, MENLO PARK, CA 94025, USA 2SCHOOL OF GEOGRAPHY, GEOLOGY AND ENVIRONMENTAL SCIENCE, UNIVERSITY OF AUCKLAND, PB 92019 AUCKLAND MAIL CENTRE, AUCKLAND 1142, NEW ZEALAND Downloaded from https://academic.oup.com/petrology/article/48/5/951/1472295 by guest on 29 September 2021 RECEIVED JANUARY 7, 2006; ACCEPTED FEBRUARY 13, 2007 ADVANCE ACCESS PUBLICATION MARCH 29, 2007 Compositional data for 4400 pumice clasts, organized according to and the roofward decline in liquidus temperature of the zoned melt, eruptive sequence, crystal content, and texture, provide new perspec- prevented significant crystallization against the roof, consistent with tives on eruption and pre-eruptive evolution of the4600 km3 of zoned dominance of crystal-poor magma early in the eruption and lack of rhyolitic magma ejected as the BishopTuff during formation of Long any roof-rind fragments among the Bishop ejecta, before or after onset Valley caldera. Proportions and compositions of different pumice of caldera collapse. A model of secular incremental zoning is types are given for each ignimbrite package and for the intercalated advanced wherein numerous batches of crystal-poor melt were plinian pumice-fall layers that erupted synchronously. Although released from a mush zone (many kilometers thick) that floored the withdrawal of the zoned magma was less systematic than previously accumulating rhyolitic melt-rich body. Each batch rose to its own realized, the overall sequence displays trends toward greater propor- appropriate level in the melt-buoyancy gradient, which was self- tions of less evolved pumice, more crystals (0Á5^24 wt %), and sustaining against wholesale convective re-homogenization, while higher FeTi-oxide temperatures (714^8188C). -
Volcanic Vistas Discover National Forests in Central Oregon Summer 2009 Celebrating the Re-Opening of Lava Lands Visitor Center Inside
Volcanic Vistas Discover National Forests in Central Oregon Summer 2009 Celebrating the re-opening of Lava Lands Visitor Center Inside.... Be Safe! 2 LAWRENCE A. CHITWOOD Go To Special Places 3 EXHIBIT HALL Lava Lands Visitor Center 4-5 DEDICATED MAY 30, 2009 Experience Today 6 For a Better Tomorrow 7 The Exhibit Hall at Lava Lands Visitor Center is dedicated in memory of Explore Newberry Volcano 8-9 Larry Chitwood with deep gratitude for his significant contributions enlightening many students of the landscape now and in the future. Forest Restoration 10 Discover the Natural World 11-13 Lawrence A. Chitwood Discovery in the Kids Corner 14 (August 4, 1942 - January 4, 2008) Take the Road Less Traveled 15 Larry was a geologist for the Deschutes National Forest from 1972 until his Get High on Nature 16 retirement in June 2007. Larry was deeply involved in the creation of Newberry National Volcanic Monument and with the exhibits dedicated in 2009 at Lava Lands What's Your Interest? Visitor Center. He was well known throughout the The Deschutes and Ochoco National Forests are a recre- geologic and scientific communities for his enthusiastic support for those wishing ation haven. There are 2.5 million acres of forest including to learn more about Central Oregon. seven wilderness areas comprising 200,000 acres, six rivers, Larry was a gifted storyteller and an ever- 157 lakes and reservoirs, approximately 1,600 miles of trails, flowing source of knowledge. Lava Lands Visitor Center and the unique landscape of Newberry National Volcanic Monument. Explore snow- capped mountains or splash through whitewater rapids; there is something for everyone. -
Canadian Volcanoes, Based on Recent Seismic Activity; There Are Over 200 Geological Young Volcanic Centres
Volcanoes of Canada 1 V4 C.J. Hickson and M. Ulmi, Jan. 3, 2006 • Global Volcanism and Plate tectonics Where do volcanoes occur? Driving forces • Volcano chemistry and eruption types • Volcanic Hazards Pyroclastic flows and surges Lava flows Ash fall (tephra) Lahars/Debris Flows Debris Avalanches Volcanic Gases • Anatomy of an Eruption – Mt. St. Helens • Volcanoes of Canada Stikine volcanic belt Presentation Outline Anahim volcanic belt Wells Gray – Clearwater volcanic field 2 Garibaldi volcanic belt • USA volcanoes – Cascade Magmatic Arc V4 Volcanoes in Our Backyard Global Volcanism and Plate tectonics In Canada, British Columbia and Yukon are the host to a vast wealth of volcanic 3 landforms. V4 How many active volcanoes are there on Earth? • Erupting now about 20 • Each year 50-70 • Each decade about 160 • Historical eruptions about 550 Global Volcanism and Plate tectonics • Holocene eruptions (last 10,000 years) about 1500 Although none of Canada’s volcanoes are erupting now, they have been active as recently as a couple of 4 hundred years ago. V4 The Earth’s Beginning Global Volcanism and Plate tectonics 5 V4 The Earth’s Beginning These global forces have created, mountain Global Volcanism and Plate tectonics ranges, continents and oceans. 6 V4 continental crust ic ocean crust mantle Where do volcanoes occur? Global Volcanism and Plate tectonics 7 V4 Driving Forces: Moving Plates Global Volcanism and Plate tectonics 8 V4 Driving Forces: Subduction Global Volcanism and Plate tectonics 9 V4 Driving Forces: Hot Spots Global Volcanism and Plate tectonics 10 V4 Driving Forces: Rifting Global Volcanism and Plate tectonics Ocean plates moving apart create new crust. -
Overview for Geologic Field-Trip Guides to Mount Mazama, Crater Lake Caldera, and Newberry Volcano, Oregon
Overview for Geologic Field-Trip Guides to Mount Mazama, Crater Lake Caldera, and Newberry Volcano, Oregon Scientific Investigations Report 2017–5022–J U.S. Department of the Interior U.S. Geological Survey Cover (top photo): View east-northeast from Garfield Peak on the south rim of Crater Lake caldera. Peak on skyline is 8,929 feet (2,722 meters) Mount Scott, an ~420 thousand years before present (ka) dacite stratovolcano considered to be part of Mount Mazama, the volcano that collapsed during the caldera-forming eruption ~7,700 years ago. The caldera walls in this view expose Mazama lava flows and fragmental deposits from as old as ~400 ka at Phantom Cone, adjacent to tiny Phantom Ship island, to as young as ~27 ka at Redcloud Cliff, the V-shaped face at the top of the wall left of center. The beheaded glacial valley of Kerr Notch, the low point on the caldera rim, is seen between Phantom Ship and Mount Scott. Photograph by Carly McLanahan. Cover (bottom photo): Newberry Volcano, Oregon, is the largest volcano in the Cascades volcanic arc. This north-facing view taken from the volcano’s peak, Paulina Peak (elevation 7,984 feet), encompasses much of the volcano’s 4-by-5-milewide central caldera, a volcanic depression formed in a powerful explosive eruption about 75,000 years ago. The caldera’s two lakes, Paulina Lake (left) and the slightly higher East Lake (right), are fed in part by active hot springs heated by molten rock (magma) deep beneath the caldera. The Central Pumice Cone sits between the lakes. -
DOGAMI Special Paper 25, Pumice in Oregon
.., N a: w c.. c( c.. .J c( 0 w 1'1. (/) PUMICE IN OREGON 1992 STATE OF OREGON DEPARTMENT OF GEOLOGY AND MINERAL INDUSTRIES DONALD A. HULL, STATE GEOLOGIST STATE OF OREGON DEPARTMENT OF GEOLOGY AND MINERAL INDUSTRIES 965 State Office Building, 800 NE Oregon Street # 28 Portland, Oregon 97232 SPECIAL PAPER 25 PUMICE IN OREGON By Ronald P. Geitgey Oregon Department of Geology and Mineral Industries 1992 Conducted and published in conformance with ORS 516.030 GOVERNING BOARD STATE GEOLOGIST Ronald K. Culbertson, Chair Myrtle Creek Donald A. Hull John W. Stephens Portland D EPUTY STATE GEOLOGIST Jacqueline G. Haggerty-Foster Pendleton John D. Beaulieu COVER PHOTOGRAPHS (top to bottom) I. One of several mining pits of Central Oregon Pu tni(;e Company in Bend. Des(;hutes County. 2. Lightweight concrete block made with pumke aggregate. 3. Section in finely vesicular pumice, transverse to the direction of vesicle elongation. 4. Example showing the ce llular characteristics of pumice retained even in small fragments. Oregon Department of Geology and Mi neral Industries Special Papers, ISSN 0278-3703 ii CONTENTS Page SUMMARY ......... ... ...... ... ................................. ... ...................... I ACKNOWLEDGMENTS . I INTRODUCTION ......... .. .. ... ... ... ............................................ 2 PURPOSE AND SCOPE OF STUDY ........................ .. .. ......................... .... ... ....... 2 UN ITS USED IN STUDY .... .. .. .. ............................ .. .............. ... ... ... ... 2 GEOLOGY AND CHARACTERISTICS OF