A5075572289- Geological and Geochemical Analysis
- Geology and Paleoclimatology Research
- earthquake and tectonic studies
- Geological formations and processes
- High-pressure geophysics and materials
- Methane Hydrates and Related Phenomena
- Geochemistry and Geologic Mapping
- Geological and Geophysical Studies
- Landslides and related hazards
- Planetary Science and Exploration
- Cryospheric studies and observations
- Paleontology and Stratigraphy of Fossils
- Hydrocarbon exploration and reservoir analysis
- Geological Studies and Exploration
- Earthquake Detection and Analysis
- Hydrology and Sediment Transport Processes
- Astro and Planetary Science
- Marine and environmental studies
- Combustion and Detonation Processes
- Tropical and Extratropical Cyclones Research
- Seismic Waves and Analysis
- Polar Research and Ecology
- Granular flow and fluidized beds
- Geomagnetism and Paleomagnetism Studies
- Geotourism and Geoheritage Conservation
University of Otago
2016-2025
The Centre for Health (New Zealand)
2024
Japan External Trade Organization
2019
University of Bristol
2019
Ecological Society of America
2017
Tufts University
2015
Norfolk Public Schools
2007-2009
Shell (Japan)
2007
University of Pittsburgh
2007
University of Würzburg
2006
Research Article| August 01, 2006 Primary volcaniclastic rocks J.D.L. White; White 1Department of Geology, University Otago, P.O. Box 56, Dunedin, New Zealand Search for other works by this author on: GSW Google Scholar B.F. Houghton 2Department Geology & Geophysics, School Ocean Earth Sciences Technology, 1680 East-West Road, Honolulu, Hawaii 96822, USA Author and Article Information Publisher: Geological Society America Received: 29 Dec 2005 Revision 19 Mar Accepted: 28 First Online: 09...
Research Article| December 01, 2012 Revised conceptual model for maar-diatremes: Subsurface processes, energetics, and eruptive products Greg A. Valentine; Valentine * 1Department of Geology, 411 Cooke Hall, University at Buffalo, New York 14260, USA *E-mail: gav4@buffalo.edu. Search other works by this author on: GSW Google Scholar James D.L. White 2Geology Department, Otago, P.O. Box 56, Dunedin 9054, Zealand Author Article Information Publisher: Geological Society America Received: 13 Mar...
Abstract Pumice rafts are floating mobile accumulations of low-density pumice clasts generated by silicic volcanic eruptions. in can drift for years, become waterlogged and sink, or stranded on shorelines. Here we show that the raft formed impressive, deep submarine eruption Havre caldera volcano (Southwest Pacific) July 2012 be mapped satellite imagery augmented sailing crew observations. Far from coastal interference, produced a single >400 km 2 1 day, thus initiating gigantic,...
The 2012 submarine eruption of Havre volcano in the Kermadec arc, New Zealand, is largest deep-ocean history and one very few recorded eruptions involving rhyolite magma. It was recognized from a gigantic 400-km2 pumice raft seen satellite imagery, but complexity this event concealed beneath sea surface. Mapping, observations, sampling by submersibles have provided an exceptionally high fidelity record seafloor products, which included lava sourced 14 vents at water depths 900 to 1220 m,...
Piston cores collected from IODP drilling platforms (and its predecessors) provide the best long-term geological and climatic record of marine sediments worldwide.Coring disturbances affecting original sediment texture have been recognized since early days coring include deformation resulting shear against core barrel, basal flow-in due to partial stroke, loss stratigraphy, fall-in, through catchers, structures formed during recovery on-deck transport.The most severe occur in noncohesive...
Fragmentation processes in eruptions are commonly contrasted as phreatomagmatic or magmatic; the latter requires only fragmentation of magma without external intervention, but often carries connotation disruption by bubbles magmatic gas. Phreatomagmatic involves vaporization and expansion water steam with rapid cooling and/or quenching magma. It is common to assess whether a pyroclast formed using particle vesicularity, shape particles, degree quenching. widely known that none these criteria...
Abstract Basaltic maar‐diatreme volcanoes, which have craters cut into preeruption landscapes (maars) underlain by downward‐tapering bodies of fragmental material commonly hypabyssal intrusions (diatremes), are produced multiple subsurface phreatomagmatic explosions. Although many maar‐diatremes been studied, the link between explosion dynamics and resulting deposit architecture is still poorly understood. Scaled experiments employed buried explosions known energies depths within layered...