Geoffrey Phelps, MSc
Phelps works in the GMEG Science Center. He received a BA in geology from UC Berkeley and an MSc from the University of London, Birkbeck in geographic information science. He specializes in geologic mapping, gravity and magnetics, and spatial analysis. Presently his research is focused on using data science tools in 2D and 3D geologic mapping, and gravity and magnetic forward and inverse modeling.
Science and Products
Filter Total Items: 29
The Pilot Valley shoreline: An early record of Lake Bonneville dynamics The Pilot Valley shoreline: An early record of Lake Bonneville dynamics
The Pilot Valley shoreline is named for distinctive gravel beaches on the eastern, northern, and western sides of Pilot Valley playa, Utah. The shoreline has been identified across the Bonneville basin where it is characterized by one to three beach crests between ~ 1305 and 1309 m elevation, all overlain by deep-water marl of Lake Bonneville. It thus represents the lowest and earliest...
Authors
David M. Miller, Geoffrey Phelps
Architecture, geochemistry, and paleomagnetic directions of the 5.42 Ma Broadwell Mesa basalt volcanic field, Bristol Mountains, California Architecture, geochemistry, and paleomagnetic directions of the 5.42 Ma Broadwell Mesa basalt volcanic field, Bristol Mountains, California
No abstract available.
Authors
David C. Buesch, Geoffrey Phelps
Stochastic modeling of a lava-flow aquifer system Stochastic modeling of a lava-flow aquifer system
This report describes preliminary three-dimensional geostatistical modeling of a lava-flow aquifer system using a multiple-point geostatistical model. The purpose of this study is to provide a proof-of-concept for this modeling approach. An example of the method is demonstrated using a subset of borehole geologic data and aquifer test data from a portion of the Calico Hills Formation, a...
Authors
Collin Cronkite-Ratcliff, Geoffrey A. Phelps
Investigations into near-real-time surveying for geophysical data collection using an autonomous ground vehicle Investigations into near-real-time surveying for geophysical data collection using an autonomous ground vehicle
The U.S. Geological Survey and the National Aeronautics and Space Administration are cooperatively investigating the utility of unmanned vehicles for near-real-time autonomous surveys of geophysical data collection. Initially focused on unmanned ground vehicle collection of magnetic data, this cooperative effort has brought unmanned surveying, precision guidance, near-real-time...
Authors
Geoffrey A. Phelps, C. Ippolito, R. Lee, R. Spritzer, Y. Yeh
Payload-directed control of geophysical magnetic surveys Payload-directed control of geophysical magnetic surveys
No abstract available.
Authors
Ritchie Lee, Yoo-Hsiu Yeh, C. Ippolito, John Spritzer, Geoffrey Phelps
Inversion of Gravity Data to Define the Pre-Cenozoic Surface and Regional Structures Possibly Influencing Groundwater Flow in the Rainier Mesa Region, Nye County, Nevada Inversion of Gravity Data to Define the Pre-Cenozoic Surface and Regional Structures Possibly Influencing Groundwater Flow in the Rainier Mesa Region, Nye County, Nevada
A three-dimensional inversion of gravity data from the Rainier Mesa area and surrounding regions reveals a topographically complex pre-Cenozoic basement surface. This model of the depth to pre-Cenozoic basement rocks is intended for use in a 3D hydrogeologic model being constructed for the Rainier Mesa area. Prior to this study, our knowledge of the depth to pre-Cenozoic basement rocks...
Authors
Thomas G. Hildenbrand, Geoffrey A. Phelps, Edward A. Mankinen
Science and Products
Filter Total Items: 29
The Pilot Valley shoreline: An early record of Lake Bonneville dynamics The Pilot Valley shoreline: An early record of Lake Bonneville dynamics
The Pilot Valley shoreline is named for distinctive gravel beaches on the eastern, northern, and western sides of Pilot Valley playa, Utah. The shoreline has been identified across the Bonneville basin where it is characterized by one to three beach crests between ~ 1305 and 1309 m elevation, all overlain by deep-water marl of Lake Bonneville. It thus represents the lowest and earliest...
Authors
David M. Miller, Geoffrey Phelps
Architecture, geochemistry, and paleomagnetic directions of the 5.42 Ma Broadwell Mesa basalt volcanic field, Bristol Mountains, California Architecture, geochemistry, and paleomagnetic directions of the 5.42 Ma Broadwell Mesa basalt volcanic field, Bristol Mountains, California
No abstract available.
Authors
David C. Buesch, Geoffrey Phelps
Stochastic modeling of a lava-flow aquifer system Stochastic modeling of a lava-flow aquifer system
This report describes preliminary three-dimensional geostatistical modeling of a lava-flow aquifer system using a multiple-point geostatistical model. The purpose of this study is to provide a proof-of-concept for this modeling approach. An example of the method is demonstrated using a subset of borehole geologic data and aquifer test data from a portion of the Calico Hills Formation, a...
Authors
Collin Cronkite-Ratcliff, Geoffrey A. Phelps
Investigations into near-real-time surveying for geophysical data collection using an autonomous ground vehicle Investigations into near-real-time surveying for geophysical data collection using an autonomous ground vehicle
The U.S. Geological Survey and the National Aeronautics and Space Administration are cooperatively investigating the utility of unmanned vehicles for near-real-time autonomous surveys of geophysical data collection. Initially focused on unmanned ground vehicle collection of magnetic data, this cooperative effort has brought unmanned surveying, precision guidance, near-real-time...
Authors
Geoffrey A. Phelps, C. Ippolito, R. Lee, R. Spritzer, Y. Yeh
Payload-directed control of geophysical magnetic surveys Payload-directed control of geophysical magnetic surveys
No abstract available.
Authors
Ritchie Lee, Yoo-Hsiu Yeh, C. Ippolito, John Spritzer, Geoffrey Phelps
Inversion of Gravity Data to Define the Pre-Cenozoic Surface and Regional Structures Possibly Influencing Groundwater Flow in the Rainier Mesa Region, Nye County, Nevada Inversion of Gravity Data to Define the Pre-Cenozoic Surface and Regional Structures Possibly Influencing Groundwater Flow in the Rainier Mesa Region, Nye County, Nevada
A three-dimensional inversion of gravity data from the Rainier Mesa area and surrounding regions reveals a topographically complex pre-Cenozoic basement surface. This model of the depth to pre-Cenozoic basement rocks is intended for use in a 3D hydrogeologic model being constructed for the Rainier Mesa area. Prior to this study, our knowledge of the depth to pre-Cenozoic basement rocks...
Authors
Thomas G. Hildenbrand, Geoffrey A. Phelps, Edward A. Mankinen