Patrick Hart
Geophysicist Emeritus with the USGS Pacific Coastal and Marine Science Center
Science and Products
Filter Total Items: 20
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Missing link between the Hayward and Rodgers Creek faults Missing link between the Hayward and Rodgers Creek faults
The next major earthquake to strike the ~7 million residents of the San Francisco Bay Area will most likely result from rupture of the Hayward or Rodgers Creek faults. Until now, the relationship between these two faults beneath San Pablo Bay has been a mystery. Detailed subsurface imaging provides definitive evidence of active faulting along the Hayward fault as it traverses San Pablo...
Authors
Janet Watt, David Ponce, Thomas Parsons, Patrick Hart
Subsea ice-bearing permafrost on the U.S. Beaufort Margin: 2. Borehole constraints Subsea ice-bearing permafrost on the U.S. Beaufort Margin: 2. Borehole constraints
Borehole logging data from legacy wells directly constrain the contemporary distribution of subsea permafrost in the sedimentary section at discrete locations on the U.S. Beaufort Margin and complement recent regional analyses of exploration seismic data to delineate the permafrost's offshore extent. Most usable borehole data were acquired on a ∼500 km stretch of the margin and within 30...
Authors
Carolyn D. Ruppel, Bruce Herman, Laura L. Brothers, Patrick Hart
Subsea ice-bearing permafrost on the U.S. Beaufort Margin: 1. Minimum seaward extent defined from multichannel seismic reflection data Subsea ice-bearing permafrost on the U.S. Beaufort Margin: 1. Minimum seaward extent defined from multichannel seismic reflection data
Subsea ice-bearing permafrost (IBPF) and associated gas hydrate in the Arctic have been subject to a warming climate and saline intrusion since the last transgression at the end of the Pleistocene. The consequent degradation of IBPF is potentially associated with significant degassing of dissociating gas hydrate deposits. Previous studies interpreted the distribution of subsea permafrost...
Authors
Laura Brothers, Bruce Herman, Patrick Hart, Carolyn D. Ruppel
Processing of multichannel seismic reflection data acquired in 2013 for seismic investigations of gas hydrates in the Gulf of Mexico Processing of multichannel seismic reflection data acquired in 2013 for seismic investigations of gas hydrates in the Gulf of Mexico
As part of a cooperative effort among the U.S. Geological Survey (USGS), the U.S. Department of Energy, and the U.S. Department of the Interior Bureau of Ocean Energy Management, two grids of two-dimensional multichannel seismic reflection data were acquired in the Gulf of Mexico over lease blocks Green Canyon 955 and Walker Ridge 313 between April 18 and May 3, 2013. The purpose of the...
Authors
John Miller, Warren Agena, Seth Haines, Patrick Hart
Avian malaria in Hawaiian forest birds: Infection and population impacts across species and elevations Avian malaria in Hawaiian forest birds: Infection and population impacts across species and elevations
Wildlife diseases can present significant threats to ecological systems and biological diversity, as well as domestic animal and human health. However, determining the dynamics of wildlife diseases and understanding the impact on host populations is a significant challenge. In Hawai‘i, there is ample circumstantial evidence that introduced avian malaria (Plasmodium relictum) has played...
Authors
Michael D. Samuel, Bethany L. Woodworth, Carter Atkinson, Patrick Hart, Dennis LaPointe
Widespread gas hydrate instability on the upper U.S. Beaufort margin Widespread gas hydrate instability on the upper U.S. Beaufort margin
The most climate-sensitive methane hydrate deposits occur on upper continental slopes at depths close to the minimum pressure and maximum temperature for gas hydrate stability. At these water depths, small perturbations in intermediate ocean water temperatures can lead to gas hydrate dissociation. The Arctic Ocean has experienced more dramatic warming than lower latitudes, but...
Authors
Benjamin Phrampus, Matthew Hornbach, Carolyn D. Ruppel, Patrick Hart
Science and Products
Filter Total Items: 20
No Result Found
Filter Total Items: 68
Missing link between the Hayward and Rodgers Creek faults Missing link between the Hayward and Rodgers Creek faults
The next major earthquake to strike the ~7 million residents of the San Francisco Bay Area will most likely result from rupture of the Hayward or Rodgers Creek faults. Until now, the relationship between these two faults beneath San Pablo Bay has been a mystery. Detailed subsurface imaging provides definitive evidence of active faulting along the Hayward fault as it traverses San Pablo...
Authors
Janet Watt, David Ponce, Thomas Parsons, Patrick Hart
Subsea ice-bearing permafrost on the U.S. Beaufort Margin: 2. Borehole constraints Subsea ice-bearing permafrost on the U.S. Beaufort Margin: 2. Borehole constraints
Borehole logging data from legacy wells directly constrain the contemporary distribution of subsea permafrost in the sedimentary section at discrete locations on the U.S. Beaufort Margin and complement recent regional analyses of exploration seismic data to delineate the permafrost's offshore extent. Most usable borehole data were acquired on a ∼500 km stretch of the margin and within 30...
Authors
Carolyn D. Ruppel, Bruce Herman, Laura L. Brothers, Patrick Hart
Subsea ice-bearing permafrost on the U.S. Beaufort Margin: 1. Minimum seaward extent defined from multichannel seismic reflection data Subsea ice-bearing permafrost on the U.S. Beaufort Margin: 1. Minimum seaward extent defined from multichannel seismic reflection data
Subsea ice-bearing permafrost (IBPF) and associated gas hydrate in the Arctic have been subject to a warming climate and saline intrusion since the last transgression at the end of the Pleistocene. The consequent degradation of IBPF is potentially associated with significant degassing of dissociating gas hydrate deposits. Previous studies interpreted the distribution of subsea permafrost...
Authors
Laura Brothers, Bruce Herman, Patrick Hart, Carolyn D. Ruppel
Processing of multichannel seismic reflection data acquired in 2013 for seismic investigations of gas hydrates in the Gulf of Mexico Processing of multichannel seismic reflection data acquired in 2013 for seismic investigations of gas hydrates in the Gulf of Mexico
As part of a cooperative effort among the U.S. Geological Survey (USGS), the U.S. Department of Energy, and the U.S. Department of the Interior Bureau of Ocean Energy Management, two grids of two-dimensional multichannel seismic reflection data were acquired in the Gulf of Mexico over lease blocks Green Canyon 955 and Walker Ridge 313 between April 18 and May 3, 2013. The purpose of the...
Authors
John Miller, Warren Agena, Seth Haines, Patrick Hart
Avian malaria in Hawaiian forest birds: Infection and population impacts across species and elevations Avian malaria in Hawaiian forest birds: Infection and population impacts across species and elevations
Wildlife diseases can present significant threats to ecological systems and biological diversity, as well as domestic animal and human health. However, determining the dynamics of wildlife diseases and understanding the impact on host populations is a significant challenge. In Hawai‘i, there is ample circumstantial evidence that introduced avian malaria (Plasmodium relictum) has played...
Authors
Michael D. Samuel, Bethany L. Woodworth, Carter Atkinson, Patrick Hart, Dennis LaPointe
Widespread gas hydrate instability on the upper U.S. Beaufort margin Widespread gas hydrate instability on the upper U.S. Beaufort margin
The most climate-sensitive methane hydrate deposits occur on upper continental slopes at depths close to the minimum pressure and maximum temperature for gas hydrate stability. At these water depths, small perturbations in intermediate ocean water temperatures can lead to gas hydrate dissociation. The Arctic Ocean has experienced more dramatic warming than lower latitudes, but...
Authors
Benjamin Phrampus, Matthew Hornbach, Carolyn D. Ruppel, Patrick Hart