Jeff Wynn, PhD (Former Employee)
Science and Products
Filter Total Items: 53
Mass addition at Mount St. Helens, Washington, inferred from repeated gravity surveys Mass addition at Mount St. Helens, Washington, inferred from repeated gravity surveys
Measurements of subtle changes in the Earth’s gravityfield can provideinformation on the addition/loss of mass (e.g., magma or aqueousfluids) beneath a volcano. In this study, wemeasured gravity at Mount St. Helens from 2010 to 2016 to investigate possible mass changes followingthe 2004–2008 dome-forming eruption. The raw gravity measurements were corrected for changes in themass and...
Authors
Maurizio Battaglia, Michael Lisowski, Daniel Dzurisin, Michael P. Poland, Steve Schilling, Angela K. Diefenbach, Jeff Wynn
Geology and undiscovered resource assessment of the potash-bearing Pripyat and Dnieper-Donets Basins, Belarus and Ukraine Geology and undiscovered resource assessment of the potash-bearing Pripyat and Dnieper-Donets Basins, Belarus and Ukraine
Undiscovered potash resources in the Pripyat Basin, Belarus, and Dnieper-Donets Basin, Ukraine, were assessed as part of a global mineral resource assessment led by the U.S. Geological Survey (USGS). The Pripyat Basin (in Belarus) and the Dnieper-Donets Basin (in Ukraine and southern Belarus) host stratabound and halokinetic Upper Devonian (Frasnian and Famennian) and Permian (Cisuralian...
Authors
Mark D. Cocker, Greta J. Orris, Pamela Dunlap, Bruce R. Lipin, Steve Ludington, Robert J. Ryan, Miroslaw Slowakiewicz, Gregory T. Spanski, Jeff Wynn, Chao Yang
U.S. Geological Survey assessment of global potash production and resources—A significant advancement for global development and a sustainable future. U.S. Geological Survey assessment of global potash production and resources—A significant advancement for global development and a sustainable future.
During the past 15 yr, the global requirement for fertilizers has grown considerably, mainly due to demand by a larger and wealthier world population for more and higher-quality food. The demand and price for potash as a primary fertilizer ingredient have increased in tandem, because of the necessity to increase the quantity and quality of food production on the decreasing amount of...
Authors
Mark D. Cocker, Greta J. Orris, Jeff Wynn
Detection and quantification of hydrocarbons in sediments Detection and quantification of hydrocarbons in sediments
A new technology developed by the US Geological Survey now allows for fast, direct detection of hydrocarbon plumes both in rivers and drifting in the deep ocean. Recent experiments show that the method can also detect and quantify hydrocarbons buried in river sediments and estuaries. This approach uses a variant of induced polarization, a surface-sensitive physical property of certain...
Authors
Jeff Wynn, Mike Williamson, Jeff Frank
Where is the hot rock and where is the ground water— Using CSAMT to map beneath and around Mount St. Helens Where is the hot rock and where is the ground water— Using CSAMT to map beneath and around Mount St. Helens
We have observed several new features in recent controlled-source audio-frequency magnetotelluric (CSAMT) soundings on and around Mount St. Helens, Washington State, USA. We have identified the approximate location of a strong electrical conductor at the edges of and beneath the 2004–08 dome. We interpret this conductor to be hot brine at the hot-intrusive-cold-rock interface. This...
Authors
Jeff Wynn, Adam R. Mosbrucker, Herbert Pierce, Kurt R. Spicer
Geology and undiscovered resource assessment of the potash-bearing Central Asia Salt Basin, Turkmenistan, Uzbekistan, Tajikistan, and Afghanistan: Chapter AA in Global mineral resource assessment Geology and undiscovered resource assessment of the potash-bearing Central Asia Salt Basin, Turkmenistan, Uzbekistan, Tajikistan, and Afghanistan: Chapter AA in Global mineral resource assessment
Undiscovered potash resources in the Central Asia Salt Basin (CASB) of Turkmenistan, Uzbekistan, Tajikistan, and Afghanistan were assessed as part of a global mineral resource assessment led by the U.S. Geological Survey. The term “potash” refers to potassium-bearing, water-soluble salts derived from evaporite basins, where seawater dried up and precipitated various salt compounds; the...
Authors
Jeff Wynn, Greta J. Orris, Pamela Dunlap, Mark D. Cocker, James D. Bliss
Science and Products
Filter Total Items: 53
Mass addition at Mount St. Helens, Washington, inferred from repeated gravity surveys Mass addition at Mount St. Helens, Washington, inferred from repeated gravity surveys
Measurements of subtle changes in the Earth’s gravityfield can provideinformation on the addition/loss of mass (e.g., magma or aqueousfluids) beneath a volcano. In this study, wemeasured gravity at Mount St. Helens from 2010 to 2016 to investigate possible mass changes followingthe 2004–2008 dome-forming eruption. The raw gravity measurements were corrected for changes in themass and...
Authors
Maurizio Battaglia, Michael Lisowski, Daniel Dzurisin, Michael P. Poland, Steve Schilling, Angela K. Diefenbach, Jeff Wynn
Geology and undiscovered resource assessment of the potash-bearing Pripyat and Dnieper-Donets Basins, Belarus and Ukraine Geology and undiscovered resource assessment of the potash-bearing Pripyat and Dnieper-Donets Basins, Belarus and Ukraine
Undiscovered potash resources in the Pripyat Basin, Belarus, and Dnieper-Donets Basin, Ukraine, were assessed as part of a global mineral resource assessment led by the U.S. Geological Survey (USGS). The Pripyat Basin (in Belarus) and the Dnieper-Donets Basin (in Ukraine and southern Belarus) host stratabound and halokinetic Upper Devonian (Frasnian and Famennian) and Permian (Cisuralian...
Authors
Mark D. Cocker, Greta J. Orris, Pamela Dunlap, Bruce R. Lipin, Steve Ludington, Robert J. Ryan, Miroslaw Slowakiewicz, Gregory T. Spanski, Jeff Wynn, Chao Yang
U.S. Geological Survey assessment of global potash production and resources—A significant advancement for global development and a sustainable future. U.S. Geological Survey assessment of global potash production and resources—A significant advancement for global development and a sustainable future.
During the past 15 yr, the global requirement for fertilizers has grown considerably, mainly due to demand by a larger and wealthier world population for more and higher-quality food. The demand and price for potash as a primary fertilizer ingredient have increased in tandem, because of the necessity to increase the quantity and quality of food production on the decreasing amount of...
Authors
Mark D. Cocker, Greta J. Orris, Jeff Wynn
Detection and quantification of hydrocarbons in sediments Detection and quantification of hydrocarbons in sediments
A new technology developed by the US Geological Survey now allows for fast, direct detection of hydrocarbon plumes both in rivers and drifting in the deep ocean. Recent experiments show that the method can also detect and quantify hydrocarbons buried in river sediments and estuaries. This approach uses a variant of induced polarization, a surface-sensitive physical property of certain...
Authors
Jeff Wynn, Mike Williamson, Jeff Frank
Where is the hot rock and where is the ground water— Using CSAMT to map beneath and around Mount St. Helens Where is the hot rock and where is the ground water— Using CSAMT to map beneath and around Mount St. Helens
We have observed several new features in recent controlled-source audio-frequency magnetotelluric (CSAMT) soundings on and around Mount St. Helens, Washington State, USA. We have identified the approximate location of a strong electrical conductor at the edges of and beneath the 2004–08 dome. We interpret this conductor to be hot brine at the hot-intrusive-cold-rock interface. This...
Authors
Jeff Wynn, Adam R. Mosbrucker, Herbert Pierce, Kurt R. Spicer
Geology and undiscovered resource assessment of the potash-bearing Central Asia Salt Basin, Turkmenistan, Uzbekistan, Tajikistan, and Afghanistan: Chapter AA in Global mineral resource assessment Geology and undiscovered resource assessment of the potash-bearing Central Asia Salt Basin, Turkmenistan, Uzbekistan, Tajikistan, and Afghanistan: Chapter AA in Global mineral resource assessment
Undiscovered potash resources in the Central Asia Salt Basin (CASB) of Turkmenistan, Uzbekistan, Tajikistan, and Afghanistan were assessed as part of a global mineral resource assessment led by the U.S. Geological Survey. The term “potash” refers to potassium-bearing, water-soluble salts derived from evaporite basins, where seawater dried up and precipitated various salt compounds; the...
Authors
Jeff Wynn, Greta J. Orris, Pamela Dunlap, Mark D. Cocker, James D. Bliss
*Disclaimer: Listing outside positions with professional scientific organizations on this Staff Profile are for informational purposes only and do not constitute an endorsement of those professional scientific organizations or their activities by the USGS, Department of the Interior, or U.S. Government