T. W. Sisson
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View article: Shallow storage of the explosive Earthquake Flat Pyroclastics magma body, Okataina Volcanic Center, Taupo Volcanic Zone, New Zealand: evidence from phase-equilibria experiments
Shallow storage of the explosive Earthquake Flat Pyroclastics magma body, Okataina Volcanic Center, Taupo Volcanic Zone, New Zealand: evidence from phase-equilibria experiments Open
Rhyolitic tuffs range widely in their crystal contents from nearly aphyric to crystal-rich, and their crystal cargoes inform concepts of upper crustal magma reservoirs. The Earthquake Flat pyroclastics (Okataina Volcanic Center, Taupo Volc…
View article: Eruptive history of northern Harrat Rahat—Volume, timing, and composition of volcanism over the past 1.2 million years
Eruptive history of northern Harrat Rahat—Volume, timing, and composition of volcanism over the past 1.2 million years Open
First posted December 29, 2023 For additional information, contact: Volcano Science Center - Menlo ParkU.S. Geological Survey345 Middlefield Road, MS 910Menlo Park, CA 94025Contact Pubs Warehouse Harrat Rahat, one of several large, basalt-…
View article: The Saudi Geological Survey-U.S. Geological Survey northern Harrat Rahat project—Styles, rates, causes, and hazards of volcanism near Al Madīnah al Munawwarah, Kingdom of Saudi Arabia
The Saudi Geological Survey-U.S. Geological Survey northern Harrat Rahat project—Styles, rates, causes, and hazards of volcanism near Al Madīnah al Munawwarah, Kingdom of Saudi Arabia Open
First posted December 29, 2023 For additional information, contact: Volcano Science Center - Menlo ParkU.S. Geological Survey345 Middlefield Road, MS 910Menlo Park, CA 94025Contact Pubs Warehouse Active volcanic systems pose serious hazard…
View article: The duration and characteristics of magmatic differentiation from basalt to trachyte within the Matan volcanic center, northern Harrat Rahat, Kingdom of Saudi Arabia
The duration and characteristics of magmatic differentiation from basalt to trachyte within the Matan volcanic center, northern Harrat Rahat, Kingdom of Saudi Arabia Open
First posted December 29, 2023 For additional information, contact: Volcano Science Center - Menlo ParkU.S. Geological Survey345 Middlefield Road, MS 910Menlo Park, CA 94025Contact Pubs Warehouse A fundamental goal of igneous petrology is …
View article: Paleomagnetism of the Harrat Rahat volcanic field, Kingdom of Saudi Arabia—Geologic unit correlations and geomagnetic cryptochron identifications
Paleomagnetism of the Harrat Rahat volcanic field, Kingdom of Saudi Arabia—Geologic unit correlations and geomagnetic cryptochron identifications Open
First posted December 29, 2023 For additional information, contact: Volcano Science Center - Menlo ParkU.S. Geological Survey345 Middlefield Road, MS 910Menlo Park, CA 94025 Paleomagnetic rock samples were collected from 173 drill sites in…
View article: Mantle origin and crustal differentiation of basalts and hawaiites of northern Harrat Rahat, Kingdom of Saudi Arabia
Mantle origin and crustal differentiation of basalts and hawaiites of northern Harrat Rahat, Kingdom of Saudi Arabia Open
First posted December 29, 2023 For additional information, contact: Volcano Science Center - Menlo ParkU.S. Geological Survey345 Middlefield Road, MS 910Menlo Park, CA 94025 Quaternary volcanic rocks of northern Harrat Rahat, Kingdom of Sa…
View article: Explosive trachyte eruptions from the Al Efairia volcanic center in northern Harrat Rahat, Kingdom of Saudi Arabia
Explosive trachyte eruptions from the Al Efairia volcanic center in northern Harrat Rahat, Kingdom of Saudi Arabia Open
First posted December 29, 2023 For additional information, contact: Volcano Science Center - Menlo ParkU.S. Geological Survey345 Middlefield Road, MS 910Menlo Park, CA 94025 Harrat Rahat is an alkali basalt, continental, intraplate volcani…
View article: Isotopic and geochemical evidence for the source of volcanism at Harrat Rahat, Kingdom of Saudi Arabia
Isotopic and geochemical evidence for the source of volcanism at Harrat Rahat, Kingdom of Saudi Arabia Open
First posted December 29, 2023 For additional information, contact: Volcano Science Center - Menlo ParkU.S. Geological Survey345 Middlefield Road, MS 910Menlo Park, CA 94025 Pleistocene and Holocene basalts, hawaiites, mugearites, benmorei…
View article: Cenozoic tectonics of the western Arabia Plate related to harrat magmatism near Al Madīnah, Kingdom of Saudi Arabia
Cenozoic tectonics of the western Arabia Plate related to harrat magmatism near Al Madīnah, Kingdom of Saudi Arabia Open
First posted December 29, 2023 For additional information, contact: Volcano Science Center - Menlo ParkU.S. Geological Survey345 Middlefield Road, MS 910Menlo Park, CA 94025Contact Pubs Warehouse Sprawling volcanic fields, or harrats, in w…
View article: Ultrafast structural response of shock‐compressed plagioclase
Ultrafast structural response of shock‐compressed plagioclase Open
Meteor impacts can induce unique pressure‐dependent structural changes in minerals due to the propagation of shock waves. Plagioclase—ubiquitous throughout the Earth’s crust, extraterrestrial bodies, and meteorites—is commonly used for rec…
View article: Geologic field-trip guide to volcanism and its interaction with snow and ice at Mount Rainier, Washington
Geologic field-trip guide to volcanism and its interaction with snow and ice at Mount Rainier, Washington Open
First posted November 10, 2022 For additional information, contact: Volcano Science CenterCascades Volcano ObservatoryU.S. Geological Survey1300 SE Cardinal CourtVancouver, WA, 98683 Mount Rainier is the Pacific Northwest's iconic volcano.…
View article: Felsic Melt and Gas Mobilization During Magma Solidification: An Experimental Study at 1.1 kbar
Felsic Melt and Gas Mobilization During Magma Solidification: An Experimental Study at 1.1 kbar Open
Melt and gas transfer processes are essential to the formation and growth of the Earth’s crust and for sustaining volcanic activity. These processes also play a major role in magma fractionation at shallow depths (<10 km) where magmas stal…
View article: Geologic map of the northern Harrat Rahat volcanic field, Kingdom of Saudi Arabia
Geologic map of the northern Harrat Rahat volcanic field, Kingdom of Saudi Arabia Open
First posted January 2, 2020 For additional information, contact: Volcano Science Center - Menlo ParkU.S. Geological Survey345 Middlefield Road, MS 910Menlo Park, CA 94025 Harrat Rahat, in the west-central part of the Kingdom of Saudi Arab…
View article: Probing Magma Reservoirs to Improve Volcano Forecasts
Probing Magma Reservoirs to Improve Volcano Forecasts Open
The roots of volcanoes remain enigmatic, largely because geophysical and petrological models remain rudimentary. Scientific drilling and exploration can help.
View article: Reducing risk where tectonic plates collide—U.S. Geological Survey subduction zone science plan
Reducing risk where tectonic plates collide—U.S. Geological Survey subduction zone science plan Open
First posted June 19, 2017 For additional information, contact: USGS Earthquake Science CenterU.S. Geological Survey345 Middlefield Road Mail Stop 977 Menlo Park, CA 94025 (650) 329-4668 The U.S. Geological Survey (USGS) serves the Nation …
View article: Quantifying gas emissions from the “Millennium Eruption” of Paektu volcano, Democratic People’s Republic of Korea/China
Quantifying gas emissions from the “Millennium Eruption” of Paektu volcano, Democratic People’s Republic of Korea/China Open
Measurements of S and other volatiles during pre-eruptive crystallization suggest high gas flux during the 946 CE Paektu eruption.