David Ponce (Former Employee)
Science and Products
Filter Total Items: 119
Imaging the magmatic system of Mono Basin, California with magnetotellurics in three--dimensions Imaging the magmatic system of Mono Basin, California with magnetotellurics in three--dimensions
A three–dimensional (3D) electrical resistivity model of Mono Basin in eastern California unveils a complex subsurface filled with zones of partial melt, fluid–filled fracture networks, cold plutons, and regional faults. In 2013, 62 broadband magnetotelluric (MT) stations were collected in an array around southeastern Mono Basin from which a 3D electrical resistivity model was created...
Authors
Jared R. Peacock, Margaret T. Mangan, Darcy McPhee, David A. Ponce
A summary of the late Cenozoic stratigraphic and tectonic history of the Santa Clara Valley, California A summary of the late Cenozoic stratigraphic and tectonic history of the Santa Clara Valley, California
The late Cenozoic stratigraphic and tectonic history of the Santa Clara Valley illustrates the dynamic nature of the North American–Pacific plate boundary and its effect on basin and landscape development. Prior to early Miocene time, the area that became Santa Clara Valley consisted of eroding Franciscan complex basement structurally interleaved in places with Coast Range ophiolite and...
Authors
Victoria E. Langenheim, Robert C. Jachens, Carl M. Wentworth, Russell W. Graymer, Richard G. Stanley, Robert J. McLaughlin, Robert W. Simpson, Robert A. Williams, D. W. Andersen, David A. Ponce
Structural superposition in fault systems bounding Santa Clara Valley, California Structural superposition in fault systems bounding Santa Clara Valley, California
Santa Clara Valley is bounded on the southwest and northeast by active strike-slip and reverse-oblique faults of the San Andreas fault system. On both sides of the valley, these faults are superposed on older normal and/or right-lateral normal oblique faults. The older faults comprised early components of the San Andreas fault system as it formed in the wake of the northward passage of...
Authors
Russell W. Graymer, Richard G. Stanley, David A. Ponce, Robert C. Jachens, Robert W. Simpson, Carl M. Wentworth
Subsurface geometry of the San Andreas-Calaveras fault junction: Influence of serpentinite and the Coast Range Ophiolite Subsurface geometry of the San Andreas-Calaveras fault junction: Influence of serpentinite and the Coast Range Ophiolite
While an enormous amount of research has been focused on trying to understand the geologic history and neotectonics of the San Andreas-Calaveras fault (SAF-CF) junction, fundamental questions concerning fault geometry and mechanisms for slip transfer through the junction remain. We use potential-field, geologic, geodetic, and seismicity data to investigate the 3-D geologic framework of...
Authors
Janet Tilden Watt, David A. Ponce, Russell W. Graymer, Robert C. Jachens, Robert W. Simpson
Magnetic and gravity studies of Mono Lake, east-central, California Magnetic and gravity studies of Mono Lake, east-central, California
From August 26 to September 5, 2011, the U.S. Geological Survey (USGS) collected more than 600 line-kilometers of shipborne magnetic data on Mono Lake, 20 line-kilometers of ground magnetic data on Paoha Island, 50 gravity stations on Paoha and Negit Islands, and 28 rock samples on Paoha and Negit Islands, in east-central California. Magnetic and gravity investigations were undertaken in...
Authors
Noah D. Athens, David A. Ponce, Angela S. Jayko, Matt Miller, Bobby McEvoy, Mae Marcaida, Margaret T. Mangan, Stuart K. Wilkinson, James S. McClain, Bruce A. Chuchel, Kevin M. Denton
By
Geology, Energy, and Minerals Mission Area, Natural Hazards Mission Area, Energy Resources Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Groundwater and Streamflow Information Program, Volcano Hazards Program, Volcano Science Center, Geology, Minerals, Energy, and Geophysics Science Center
Methods and spatial extent of geophysical Investigations, Mono Lake, California, 2009 to 2011 Methods and spatial extent of geophysical Investigations, Mono Lake, California, 2009 to 2011
This report summarizes the methods and spatial extent of geophysical surveys conducted on Mono Lake and Paoha Island by U.S. Geological Survey during 2009 and 2011. The surveys include acquisition of new high resolution seismic reflection data, shipborne high resolution magnetic data, and ground magnetic and gravity data on Paoha Island. Several trials to acquire swath bathymetry and...
Authors
A. S. Jayko, P. E. Hart, J.R. Childs, M.-H. Cormier, D. A. Ponce, N. D. Athens, J. S. McClain
Science and Products
Filter Total Items: 119
Imaging the magmatic system of Mono Basin, California with magnetotellurics in three--dimensions Imaging the magmatic system of Mono Basin, California with magnetotellurics in three--dimensions
A three–dimensional (3D) electrical resistivity model of Mono Basin in eastern California unveils a complex subsurface filled with zones of partial melt, fluid–filled fracture networks, cold plutons, and regional faults. In 2013, 62 broadband magnetotelluric (MT) stations were collected in an array around southeastern Mono Basin from which a 3D electrical resistivity model was created...
Authors
Jared R. Peacock, Margaret T. Mangan, Darcy McPhee, David A. Ponce
A summary of the late Cenozoic stratigraphic and tectonic history of the Santa Clara Valley, California A summary of the late Cenozoic stratigraphic and tectonic history of the Santa Clara Valley, California
The late Cenozoic stratigraphic and tectonic history of the Santa Clara Valley illustrates the dynamic nature of the North American–Pacific plate boundary and its effect on basin and landscape development. Prior to early Miocene time, the area that became Santa Clara Valley consisted of eroding Franciscan complex basement structurally interleaved in places with Coast Range ophiolite and...
Authors
Victoria E. Langenheim, Robert C. Jachens, Carl M. Wentworth, Russell W. Graymer, Richard G. Stanley, Robert J. McLaughlin, Robert W. Simpson, Robert A. Williams, D. W. Andersen, David A. Ponce
Structural superposition in fault systems bounding Santa Clara Valley, California Structural superposition in fault systems bounding Santa Clara Valley, California
Santa Clara Valley is bounded on the southwest and northeast by active strike-slip and reverse-oblique faults of the San Andreas fault system. On both sides of the valley, these faults are superposed on older normal and/or right-lateral normal oblique faults. The older faults comprised early components of the San Andreas fault system as it formed in the wake of the northward passage of...
Authors
Russell W. Graymer, Richard G. Stanley, David A. Ponce, Robert C. Jachens, Robert W. Simpson, Carl M. Wentworth
Subsurface geometry of the San Andreas-Calaveras fault junction: Influence of serpentinite and the Coast Range Ophiolite Subsurface geometry of the San Andreas-Calaveras fault junction: Influence of serpentinite and the Coast Range Ophiolite
While an enormous amount of research has been focused on trying to understand the geologic history and neotectonics of the San Andreas-Calaveras fault (SAF-CF) junction, fundamental questions concerning fault geometry and mechanisms for slip transfer through the junction remain. We use potential-field, geologic, geodetic, and seismicity data to investigate the 3-D geologic framework of...
Authors
Janet Tilden Watt, David A. Ponce, Russell W. Graymer, Robert C. Jachens, Robert W. Simpson
Magnetic and gravity studies of Mono Lake, east-central, California Magnetic and gravity studies of Mono Lake, east-central, California
From August 26 to September 5, 2011, the U.S. Geological Survey (USGS) collected more than 600 line-kilometers of shipborne magnetic data on Mono Lake, 20 line-kilometers of ground magnetic data on Paoha Island, 50 gravity stations on Paoha and Negit Islands, and 28 rock samples on Paoha and Negit Islands, in east-central California. Magnetic and gravity investigations were undertaken in...
Authors
Noah D. Athens, David A. Ponce, Angela S. Jayko, Matt Miller, Bobby McEvoy, Mae Marcaida, Margaret T. Mangan, Stuart K. Wilkinson, James S. McClain, Bruce A. Chuchel, Kevin M. Denton
By
Geology, Energy, and Minerals Mission Area, Natural Hazards Mission Area, Energy Resources Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Groundwater and Streamflow Information Program, Volcano Hazards Program, Volcano Science Center, Geology, Minerals, Energy, and Geophysics Science Center
Methods and spatial extent of geophysical Investigations, Mono Lake, California, 2009 to 2011 Methods and spatial extent of geophysical Investigations, Mono Lake, California, 2009 to 2011
This report summarizes the methods and spatial extent of geophysical surveys conducted on Mono Lake and Paoha Island by U.S. Geological Survey during 2009 and 2011. The surveys include acquisition of new high resolution seismic reflection data, shipborne high resolution magnetic data, and ground magnetic and gravity data on Paoha Island. Several trials to acquire swath bathymetry and...
Authors
A. S. Jayko, P. E. Hart, J.R. Childs, M.-H. Cormier, D. A. Ponce, N. D. Athens, J. S. McClain
*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