David Ponce (Former Employee)
Science and Products
Filter Total Items: 119
Regional geophysical expression of a carbonatite terrane in the eastern Mojave Desert, California Regional geophysical expression of a carbonatite terrane in the eastern Mojave Desert, California
A world-class, rare earth element carbonatite deposit is located near Mountain Pass, in the eastern Mojave Desert of California and is hosted by Proterozoic rocks that extend along the eastern margins of the Clark Mountain Range, Mescal Range, and Ivanpah Mountains in a north-northwest trending fault-bounded block. This Proterozoic block is generally composed of a complex of 1.7 - 1.6 Ga...
Authors
David A. Ponce, Kevin M. Denton, David M. Miller
Geophysical studies in the vicinity of Blue Mountain and Pumpernickel Valley near Winnemucca, north-central Nevada Geophysical studies in the vicinity of Blue Mountain and Pumpernickel Valley near Winnemucca, north-central Nevada
From May 2008 to September 2009, the U.S. Geological Survey (USGS) collected data from more than 660 gravity stations, 100 line-km of truck-towed magnetometer traverses, and 260 physical-property sites in the vicinity of Blue Mountain and Pumpernickel Valley, northern Nevada (fig. 1). Gravity, magnetic, and physical-property data were collected to study regional crustal structures as an...
Authors
David A. Ponce
Long-term creep rates on the Hayward Fault: Evidence for controls on the size and frequency of large earthquakes Long-term creep rates on the Hayward Fault: Evidence for controls on the size and frequency of large earthquakes
The Hayward fault (HF) in California exhibits large (Mw 6.5–7.1) earthquakes with short recurrence times (161±65 yr), probably kept short by a 26%–78% aseismic release rate (including postseismic). Its interseismic release rate varies locally over time, as we infer from many decades of surface creep data. Earliest estimates of creep rate, primarily from infrequent surveys of offset...
Authors
James J. Lienkaemper, Forrest S. McFarland, Robert W. Simpson, Roger G. Bilham, David A. Ponce, John Boatwright, S. John Caskey
Geophysical setting of the February 21, 2008 Mw 6 Wells earthquake, Nevada, and implications for earthquake hazards Geophysical setting of the February 21, 2008 Mw 6 Wells earthquake, Nevada, and implications for earthquake hazards
We utilize gravity and magnetic methods to investigate the regional geophysical setting of the Wells earthquake. In particular, we delineate major crustal structures that may have played a role in the location of the earthquake and discuss the geometry of a nearby sedimentary basin that may have contributed to observed ground shaking. The February 21, 2008 Mw 6.0 Wells earthquake...
Authors
David A. Ponce, Janet T. Watt, C. Bouligand
The northwestern margin of the Basin and Range province: Part 2: Structural setting of a developing basin from seismic and potential field data The northwestern margin of the Basin and Range province: Part 2: Structural setting of a developing basin from seismic and potential field data
Surprise Valley in northeastern California offers an ideal opportunity to examine the structural setting of a developing extensional basin due to its late Miocene to recent activity in isolation from other major normal fault-bound basins. Seismic velocity and potential field modeling help determine the nature of basin fill and identify intra-basin faults. Based on a detailed gravity and...
Authors
Anne E. Egger, Jonathan M.G. Glen, David A. Ponce
Geophysical setting of the blue mountain geothermal area, North-Central Nevada and its relationship to a crustal-scale fracture associated with the inception of the Yellowstone hotspot Geophysical setting of the blue mountain geothermal area, North-Central Nevada and its relationship to a crustal-scale fracture associated with the inception of the Yellowstone hotspot
No abstract available.
Authors
David A. Ponce, Jonathan M.G. Glen, Janet Watt, John Casteel
Science and Products
Filter Total Items: 119
Regional geophysical expression of a carbonatite terrane in the eastern Mojave Desert, California Regional geophysical expression of a carbonatite terrane in the eastern Mojave Desert, California
A world-class, rare earth element carbonatite deposit is located near Mountain Pass, in the eastern Mojave Desert of California and is hosted by Proterozoic rocks that extend along the eastern margins of the Clark Mountain Range, Mescal Range, and Ivanpah Mountains in a north-northwest trending fault-bounded block. This Proterozoic block is generally composed of a complex of 1.7 - 1.6 Ga...
Authors
David A. Ponce, Kevin M. Denton, David M. Miller
Geophysical studies in the vicinity of Blue Mountain and Pumpernickel Valley near Winnemucca, north-central Nevada Geophysical studies in the vicinity of Blue Mountain and Pumpernickel Valley near Winnemucca, north-central Nevada
From May 2008 to September 2009, the U.S. Geological Survey (USGS) collected data from more than 660 gravity stations, 100 line-km of truck-towed magnetometer traverses, and 260 physical-property sites in the vicinity of Blue Mountain and Pumpernickel Valley, northern Nevada (fig. 1). Gravity, magnetic, and physical-property data were collected to study regional crustal structures as an...
Authors
David A. Ponce
Long-term creep rates on the Hayward Fault: Evidence for controls on the size and frequency of large earthquakes Long-term creep rates on the Hayward Fault: Evidence for controls on the size and frequency of large earthquakes
The Hayward fault (HF) in California exhibits large (Mw 6.5–7.1) earthquakes with short recurrence times (161±65 yr), probably kept short by a 26%–78% aseismic release rate (including postseismic). Its interseismic release rate varies locally over time, as we infer from many decades of surface creep data. Earliest estimates of creep rate, primarily from infrequent surveys of offset...
Authors
James J. Lienkaemper, Forrest S. McFarland, Robert W. Simpson, Roger G. Bilham, David A. Ponce, John Boatwright, S. John Caskey
Geophysical setting of the February 21, 2008 Mw 6 Wells earthquake, Nevada, and implications for earthquake hazards Geophysical setting of the February 21, 2008 Mw 6 Wells earthquake, Nevada, and implications for earthquake hazards
We utilize gravity and magnetic methods to investigate the regional geophysical setting of the Wells earthquake. In particular, we delineate major crustal structures that may have played a role in the location of the earthquake and discuss the geometry of a nearby sedimentary basin that may have contributed to observed ground shaking. The February 21, 2008 Mw 6.0 Wells earthquake...
Authors
David A. Ponce, Janet T. Watt, C. Bouligand
The northwestern margin of the Basin and Range province: Part 2: Structural setting of a developing basin from seismic and potential field data The northwestern margin of the Basin and Range province: Part 2: Structural setting of a developing basin from seismic and potential field data
Surprise Valley in northeastern California offers an ideal opportunity to examine the structural setting of a developing extensional basin due to its late Miocene to recent activity in isolation from other major normal fault-bound basins. Seismic velocity and potential field modeling help determine the nature of basin fill and identify intra-basin faults. Based on a detailed gravity and...
Authors
Anne E. Egger, Jonathan M.G. Glen, David A. Ponce
Geophysical setting of the blue mountain geothermal area, North-Central Nevada and its relationship to a crustal-scale fracture associated with the inception of the Yellowstone hotspot Geophysical setting of the blue mountain geothermal area, North-Central Nevada and its relationship to a crustal-scale fracture associated with the inception of the Yellowstone hotspot
No abstract available.
Authors
David A. Ponce, Jonathan M.G. Glen, Janet Watt, John Casteel
*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