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A Pictorial Summary of the Life and Work of George Patrick Leonard Walker
A pictorial summary of the life and work of George Patrick Leonard Walker SCOTT K. ROWLAND1* & R. S. J. SPARKS2 1Department of Geology and Geophysics, University of Hawaii at Manoa, 1680 East–West Road, Honolulu, Hawaii, USA 2Department of Earth Sciences, University of Bristol, Bristol BS8 1RJ, UK *Corresponding author (e-mail: [email protected]) Abstract: George Patrick Leonard Walker was one of the fathers of modern volcanology. He worked in many parts of the world and contributed to the understanding of a huge range of volca- nological processes. He was a field geologist at heart, and one of his greatest skills was the ability to quantify volcanological ideas – not with obscure statistical treatments or complex numerical models, but with clear graphical relationships supported by tremendous amounts of carefully col- lected field data. Here we present some glimpses of his life and work in photographs and diagrams. George Walker was born on 2 March 1926 in Iceland, as well as to India, Italy, the Azores and London. In 1939, when he was 13, the family Africa, among other locations. In 1978 George moved to Northern Ireland. In 1948 and 1949, moved to the University of Auckland and in 1982 respectively, George received his Bachelors and he moved to the University of Hawaii. Over the Masters degrees from Queen’s University, Belfast. span of his career he visited almost every volcanic In 1956 he completed his PhD at the University of region in the world, including Australia, the Azores, Leeds with a dissertation on secondary minerals in the Canary Islands, Chile, China, Costa Rica, igneous rocks of Northern Iceland. -
Volcanic Eruption Impacts Student Worksheet
Volcanic Eruption Impacts Student Worksheet Explosive and Effusive Volcanoes The type of volcanic eruption is largely determined by magma composition. Flux-mediated melting at subduction zones creates a felsic magma with high levels of carbon dioxide and water. These dissolved gases explode during eruption. Effusive volcanoes have a hotter, more mafic magma with lower levels of dissolved gas, allowing them to erupt more calmly (effusive eruption). Sinabung (Indonesia) Mount Sinabung is a stratovolcano located 40 km from the Lake Toba supervolcano in North Sumatra. It lies along the Sunda Arc, where the Indo-Australian plate subducts beneath the Sunda and Burma plates. After 1200 years of dormancy, Sinabung began erupting intermittently in 2010. Major eruptions have occurred regularly since November 2013. In November and December 2015, ash plumes reached 6 – 11 km in height on multiple occasions. Pyroclastic flows and ashfall blanketed the region in January 2014 and lava flows travelled down the south flank, advancing 2.5 km by April 2014. Pyroclastic flows in February 2014 killed 17 people in a town 3 km from the vent. In June 2015, ash falls affected areas 10 – 15 km from the summit on many occasions. A lahar in May 2016, caused fatalities in a village 20 km from Sinabung. Pyroclastic flows occurred frequently throughout 2016 and 2017 Eruption of Sinabung 6 October 2016 Major eruptions occurred in 2018 and 2019. In (Y Ginsu, public domain) February 2018, an eruption destroyed a lava dome of 1.6 million cubic metres. At least 10 pyroclastic flows extended up to 4.9 km and an ash plume rose more than 16 km in altitude. -
Mars Field Geology, Biology, and Paleontology Workshop, Summary
MARS FIELD GEOLOGY, BIOLOGY, AND PALEONTOLOGY WORKSHOP: SUMMARY AND RECOMMENDATIONS November 18–19, 1998 Space Center Houston, Houston, Texas LPI Contribution No. 968 MARS FIELD GEOLOGY, BIOLOGY, AND PALEONTOLOGY WORKSHOP: SUMMARY AND RECOMMENDATIONS November 18–19, 1998 Space Center Houston Edited by Nancy Ann Budden Lunar and Planetary Institute Sponsored by Lunar and Planetary Institute National Aeronautics and Space Administration Lunar and Planetary Institute 3600 Bay Area Boulevard Houston TX 77058-1113 LPI Contribution No. 968 Compiled in 1999 by LUNAR AND PLANETARY INSTITUTE The Institute is operated by the Universities Space Research Association under Contract No. NASW-4574 with the National Aeronautcis and Space Administration. Material in this volume may be copied without restraint for library, abstract service, education, or personal research purposes; however, republication of any paper or portion thereof requires the written permission of the authors as well as the appropriate acknowledgment of this publication. This volume may be cited as Budden N. A., ed. (1999) Mars Field Geology, Biology, and Paleontology Workshop: Summary and Recommendations. LPI Contribution No. 968, Lunar and Planetary Institute, Houston. 80 pp. This volume is distributed by ORDER DEPARTMENT Lunar and Planetary Institute 3600 Bay Area Boulevard Houston TX 77058-1113 Phone: 281-486-2172 Fax: 281-486-2186 E-mail: [email protected] Mail order requestors will be invoiced for the cost of shipping and handling. _________________ Cover: Mars test suit subject and field geologist Dean Eppler overlooking Meteor Crater, Arizona, in Mark III Mars EVA suit. PREFACE In November 1998 the Lunar and Planetary Institute, under the sponsorship of the NASA/HEDS (Human Exploration and Development of Space) Enterprise, held a workshop to explore the objectives, desired capabilities, and operational requirements for the first human exploration of Mars. -
Educators Guide
EDUCATORS GUIDE 02 | Supervolcanoes Volcanism is one of the most creative and destructive processes on our planet. It can build huge mountain ranges, create islands rising from the ocean, and produce some of the most fertile soil on the planet. It can also destroy forests, obliterate buildings, and cause mass extinctions on a global scale. To understand volcanoes one must first understand the theory of plate tectonics. Plate tectonics, while generally accepted by the geologic community, is a relatively new theory devised in the late 1960’s. Plate tectonics and seafloor spreading are what geologists use to interpret the features and movements of Earth’s surface. According to plate tectonics, Earth’s surface, or crust, is made up of a patchwork of about a dozen large plates and many smaller plates that move relative to one another at speeds ranging from less than one to ten centimeters per year. These plates can move away from each other, collide into each other, slide past each other, or even be forced beneath each other. These “subduction zones” are generally where the most earthquakes and volcanoes occur. Yellowstone Magma Plume (left) and Toba Eruption (cover page) from Supervolcanoes. 01 | Supervolcanoes National Next Generation Science Standards Content Standards - Middle School Content Standards - High School MS-ESS2-a. Use plate tectonic models to support the HS-ESS2-a explanation that, due to convection, matter Use Earth system models to support cycles between Earth’s surface and deep explanations of how Earth’s internal and mantle. surface processes operate concurrently at different spatial and temporal scales to MS-ESS2-e form landscapes and seafloor features. -
GSA TODAY December Vol
Vol. 5, No. 12 December 1995 INSIDE • New Members, Fellows, Student Associates, p. 247 GSA TODAY South-Central Section Meeting, p. 250 • A Publication of the Geological Society of America • Northeastern Section Meeting, p. 253 Seismic Images of the A B Core-Mantle Boundary Michael E. Wysession, Department of Earth and Planetary Sciences, Washington University, St. Louis, MO 63130 C D ABSTRACT INTRODUCTION Seismology presents several ways While most geologists, including of providing images of the geologic specialists in the field of seismology, structures that exist in the lowermost study rocks at Earth’s surface, more mantle just above the core-mantle attention also is being paid to the boundary (CMB). An understanding planet’s other major boundary, that of the possibly complex geophysical between the core and mantle. With a E F processes occurring at this major density jump of 4.3 kg/m3 between discontinuity requires the combined the silicate lower mantle and the liquid efforts of many fields, but it is the iron outer core, as well as a tempera- role of seismology to geographically ture increase of possibly 1500 °C map out this largely uncharted terri- between the lower mantle adiabat and tory. Seismic phases that reflect, outer core, the core-mantle boundary diffract, and refract across the CMB (CMB) may well be Earth’s most signifi- can all be used to provide different cant and dramatic discontinuity. Our Figure 1. Images from a motion picture showing the propagation of seismic shear energy information in different ways. increasing knowledge of this highly through the mantle (Wysession and Shore, 1994). -
Basaltic Explosive Volcanism: Constraints from Deposits and Models B.F
ARTICLE IN PRESS Chemie der Erde 68 (2008) 117–140 www.elsevier.de/chemer INVITED REVIEW Basaltic explosive volcanism: Constraints from deposits and models B.F. HoughtonÃ, H.M. Gonnermann Department of Geology and Geophysics, University of Hawai’i at Manoa, Honolulu, HI 96822, USA Received 13 March 2008; accepted 10 April 2008 Abstract Basaltic pyroclastic volcanism takes place over a range of scales and styles, from weak discrete Strombolian 2 3 1 7 8 1 explosions ( 10 –10 kg sÀ ) to Plinian eruptions of moderate intensity (10 –10 kg sÀ ). Recent well-documented historical eruptions from Etna, Kı¯lauea and Stromboli typify this diversity. Etna is Europe’s largest and most voluminously productive volcano with an extraordinary level and diversity of Strombolian to subplinian activity since 1990. Kı¯lauea, the reference volcano for Hawaiian fountaining, has four recent eruptions with high fountaining (4400 m) activity in 1959, 1960, 1969 (–1974) and 1983–1986 (–2008); other summit (1971, 1974, 1982) and flank eruptions have been characterized by low fountaining activity. Stromboli is the type location for mildly explosive Strombolian eruptions, and from 1999 to 2008 these persisted at a rate of ca. 9 per hour, briefly interrupted in 2003 and 2007 by vigorous paroxysmal eruptions. Several properties of basaltic pyroclastic deposits described here, such as bed geometry, grain size, clast morphology and vesicularity, and crystal content are keys to understand the dynamics of the parent eruptions. The lack of clear correlations between eruption rate and style, as well as observed rapid fluctuations in eruptive behavior, point to the likelihood of eruption style being moderated by differences in the fluid dynamics of magma and gas ascent and the mechanism by which the erupting magma fragments. -
Sharon R. Allen Is a Physical Volcanologist Who Has Worked On
Sharon R. Allen is a physical volcanologist who Timothy H. Druitt is a volcanologist who works has worked on the processes and products of felsic on the processes and products of explosive volca effusive and explosive volcanism in both subaerial nism. His approaches include the field study of and submarine environments from a range of tec volcanic products, laboratory analogue experi tonic settings. She has been researching the South ments, and the petrology and chemistry of magmas. Aegean volcanic arc since 1993, first as a PhD He has used Santorini Volcano (Greece) as a natural student at Monash University (Australia), later as a laboratory for identifying fundamental questions postdoc at the University of Tasmania (UTAS) (Australia), and currently related to volcanism and for testing hypotheses. He obtained his PhD as a university associate at UTAS. Her scientific interests include subae at the University of Cambridge (UK) and is currently Professor of rial caldera forming eruptions, the dynamics of pyroclastic currents Volcanology at ClermontAuvergne University (France). He was Editor on land and when interacting with water, submarine pyroclastic erup inChief of the Bulletin of Volcanology for four years and received the tions and mechanisms for the formation of pumice in submarine set 2018 Norman L. Bowen Award of the American Geophysical Union. tings. Her approach includes field studies of volcanic products and laboratory analogue experimentation. Lorella Francalanci is a geochemist and volcano logist who investigates active volcanoes to reveal Olivier Bachmann is a professor of volcanology the preeruptive processes that are relevant to the and magmatic petrology at the Eidgenössische dynamics of volcanic eruptions. -
Earthsciencesnews Issue No 05 2014
Department of earth Sciences Magazine EarthScienceSNEWS iSSue no 05 2014 P4 Fundamental Fieldtrips P8 From Himalayas to Marcellus P10 Mineralogy in Myanmar P12 earthquake Risk in Turkey P16 London Volcano 1 modern process, underpins climate science. In diverse and subtle ways, earth sciences weLcoMe influence the discussion of windmills and carbon taxes at the present Lima climate conference or next year’s major Paris by Professor Gideon Henderson meeting. Head of Department Climate science is also important, along with many other branches of the earth sciences, in the help and guidance it provides to developing nations. Oxford earth scientists work all over the world; climate events help to initiate a burst Does the study of climate literally from Abu Dhabi to Zambia. Many of evolution? Geological understanding nations have significant natural resources, belong in an earth-sciences of climate is also important for more fascinating geology, and are threatened applied questions. Past warm periods of department? by geological hazards and environmental ocean anoxia led to the preservation of change, but lack modern geological tools Sometimes, amongst the swirl of debate hydrocarbons, still critical to global energy and the understanding to benefit from their about wind-farms, carbon taxes, and the production. And it is the winds, sun, tides resources or assess their risks. Universities policy response to warming, it is possible and waves of the earth system that offer such as Oxford have a huge amount to offer to wonder what climate has to do with the alternatives we must rapidly adopt for such nations, as evident in the department’s geology. -
Evolution Stages and Petrology of the Kekuknai Volcanic Massif As Reflecting the Magmatism in Backarc Zone of Kuril–Kamchatka Island Arc System
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Institute of Volcanology and Seismology FEB RAS Repository ISSN 07420463, Journal of Volcanology and Seismology, 2011, Vol. 5, No. 5, pp. 312–334. © Pleiades Publishing, Ltd., 2011. Original Russian Text © A.V. Koloskov, G.B. Flerov, A.B. Perepelov, I.V. Melekestsev, M.Yu. Puzankov, T.M. Filosofova, 2011, published in Vulkanologiya i Seismologiya, 2011, No. 5, pp. 17–41. Evolution Stages and Petrology of the Kekuknai Volcanic Massif as Reflecting the Magmatism in Backarc Zone of Kuril–Kamchatka Island Arc System. Part 1. Geological Position and Geochemistry of Volcanic Rocks A. V. Koloskova, G. B. Flerova, A. B. Perepelovb, I. V. Melekestseva, M. Yu. Puzankova, and T. M. Filosofovaa a Institute of Volcanology and Seismology, Far East Branch, Russian Academy of Sciences, Piipa boulevard, 9, PetropavlovskKamchatskii, 683006 Russia email: [email protected] b A. P. Vinogradov Institute of Geochemistry, Siberian Branch, Russian Academy of Sciences, ul. Favorskogo, 1A, Irkutsk, 664033 Russia email: [email protected] Received October 25, 2010 Abstract—The evolution of the Quaternary Kekuknai volcanic massif (the western flank of the Sredinnyi Range in Kamchatka) has been subdivided into five stages: (1) the precaldera trachybasalt– basaltic andes ite, (2) the extrusive trachyandesite–trachydacite, (3) the early trachybasalt, (4) the middle hawaiite– mugearite (with occasional occurrences of basaltic andesites), and (5) the late trachybasalt–hawaiite– mugearite (with occasional andesites) of areal volcanism. On the basis of petrologic data we identified the island arc and the intraplate geochemical types of rocks in the massif. -
Prospects and Pitfalls in Integrating Volcanology and Archaeology: Areview
Journal of Volcanology and Geothermal Research 401 (2020) 106977 Contents lists available at ScienceDirect Journal of Volcanology and Geothermal Research journal homepage: www.elsevier.com/locate/jvolgeores Invited review article Prospects and pitfalls in integrating volcanology and archaeology: Areview Felix Riede a,⁎, Gina L. Barnes b, Mark D. Elson c, Gerald A. Oetelaar d, Karen G. Holmberg e, Payson Sheets f a Laboratory for Past Disaster Science, Department of Archaeology and Heritage Studies, Aarhus University, Denmark b Department of Earth Sciences, Durham University, United Kingdom c School of Anthropology, University of Arizona, United States of America d Department of Anthropology and Archaeology, University of Calgary, Canada e Gallatin School of Individualized Study, New York University, United States of America f Department of Anthropology, University of Colorado, Boulder, United States of America article info abstract Article history: Volcanic eruptions and interactions with the landforms and products these yield, are a constant feature of human Received 28 February 2020 life in many parts of the world. Seen over long timespans, human–volcano interactions become stratified in sed- Received in revised form 15 June 2020 imentary archives containing eruptive products and archaeological remains. This review is concerned with Accepted 15 June 2020 charting the overlapping territory of volcanology and archaeology and attempts to plot productive routes for fur- Available online 17 June 2020 ther conjoined research. We define archaeological volcanology as a field of study that brings together incentives, insights, and methods from both volcanology and from archaeology in an effort to better understand both past Keywords: Social volcanology volcanism as well as past cultural change, and to improve risk management practices as well as the contemporary Geoarcheology engagement with volcanism and its products. -
This Dynamic Earth in January of 1992
View of the planet Earth from the Apollo spacecraft. The Red Sea, which separates Saudi Arabia from the continent of Africa, is clearly visible at the top. (Photograph courtesy of NASA.) Contents Preface Historical perspective Developing the theory Understanding plate motions "Hotspots": Mantle Some unanswered questions Plate tectonics and people Endnotes thermal plumes 1 of 77 2002-01-01 11:52 This pdf-version was edited by Peter Lindeberg in December 2001. Any deviation from the original text is non-intentional. This book was originally published in paper form in February 1996 (design and coordination by Martha Kiger; illustrations and production by Jane Russell). It is for sale for $7 from: U.S. Government Printing Office Superintendent of Documents, Mail Stop SSOP Washington, DC 20402-9328 or it can be ordered directly from the U.S. Geological Survey: Call toll-free 1-888-ASK-USGS Or write to USGS Information Services Box 25286, Building 810 Denver Federal Center Denver, CO 80225 303-202-4700; Fax 303-202-4693 ISBN 0-16-048220-8 Version 1.08 The online edition contains all text from the original book in its entirety. Some figures have been modified to enhance legibility at screen resolutions. Many of the images in this book are available in high resolution from the USGS Media for Science page. USGS Home Page URL: http://pubs.usgs.gov/publications/text/dynamic.html Last updated: 01.29.01 Contact: [email protected] 2 of 77 2002-01-01 11:52 In the early 1960s, the emergence of the theory of plate tectonics started a revolution in the earth sciences. -
Short Curriculum Vitae BRUCE FRANK HOUGHTON (A) Education University of Auckland N.Z
Short Curriculum Vitae BRUCE FRANK HOUGHTON (a) Education University of Auckland N.Z. Geology BSc (Hons) 1972 University of Otago N.Z. Volcanology PhD 1977 Ruhr Universitat Germany Volcanology Postdoctoral Fellow 1983-1984 (b) Appointments 2009-present Science Director National Disaster Preparedness Training Center. 1999-present Professor University of Hawaii, Manoa 1994-1999 Program Leader Institute of Geological & Nuclear Sciences 1992-1994 Group Manager Institute of Geological & Nuclear Sciences 1991-1992 Program Leader DSIR Geology & Geophysics 1976-1990 Volcanologist N.Z. Geological Survey (c) Awards, Honours 2021 Board of Regents Excellence in Research Award (University of Hawaii) 2021 NSF Research News Highlight 2018 Fellow of the American Geophysical Union 2018- New Zealand National Science Challenges International Advisory Group 2017 Thorarinsson Medallist, International Association of Volcanology and Chemistry of the Earth’s Interior 2014- Editorial Board, Frontiers in Earth Science. 2014-15 Editor “Encyclopaedia of Volcanoes Edition 2” (Elsevier). 2013-15 Distinguished Academic Visitor, Queens’ College, University of Cambridge. 2010-13 Editorial Board, Geology. 2010-16 Editorial Board, Journal of Applied Volcanology. 2009-13 Coordinating Scientist, Hawaiian Volcano Observatory. 2004 Fellow of the Geological Society of America. 2000 Fellow of the Royal Society of New Zealand. 2000- Hawaiian State Volcanologist. 2000- Gordon A. Macdonald Professor of Volcanology. 2000 Editor “Encyclopaedia of Volcanoes” (Academic Press). 1996-98 British Council High Education Links Award. 1996 Marsden Advisory Panel Earth Science-Astronomy. 1992 Hochstetter Lecturer, Geological Society of New Zealand. 1989 Department of Scientific & Industrial Research Prestige Award. 1989-94 Editor, Bulletin of Volcanology. 1987-07 Associate Editor, Journal of Volcanology & Geothermal Research. 1983-84 Alexander von Humboldt Fellowship.