James F Howle
James F Howle - California Water Science Center
Science and Products
Filter Total Items: 29
LiDAR-Assisted identification of an active fault near Truckee, California
We use high-resolution (1.5-2.4 points/m2) bare-earth airborne Light Detection and Ranging (LiDAR) imagery to identify, map, constrain, and visualize fault-related geomorphology in densely vegetated terrain surrounding Martis Creek Dam near Truckee, California. Bare-earth LiDAR imagery reveals a previously unrecognized and apparently youthful right-lateral strike-slip fault that exhibits laterally
Authors
L. E. Hunter, J. F. Howle, R.S. Rose, G.W. Bawden
Monitoring land-surface deformation on Bicycle Lake playa, Fort Irwin, California, USA
No abstract available.
Authors
Jill N. Densmore, Kevin Ellett, James F. Howle, Michael C. Carpenter, Michelle Sneed
Carbon dioxide emissions from vegetation-kill zones around the resurgent dome of Long Valley caldera, eastern California, USA
A survey of diffuse CO2 efflux, soil temperature and soil-gas chemistry over areas of localized vegetation-kill on and around the resurgent dome of Long Valley caldera California was performed to evaluate the premise that gaseous and thermal anomalies are related to renewed intrusion of magma. Some kill sites are long-lived features and others have developed in the past few years. Total anomalous
Authors
Deborah Bergfeld, William C. Evans, James F. Howle, Christopher D. Farrar
Transtensional deformation in the Lake Tahoe region, California and Nevada, USA
Dextral transtensional deformation is occurring along the Sierra Nevada–Great Basin boundary zone (SNGBBZ) at the eastern edge of the Sierra Nevada microplate. In the Lake Tahoe region of the SNGBBZ, transtension is partitioned spatially and temporally into domains of north–south striking normal faults and transitional domains with conjugate strike-slip faults. The normal fault domains, which have
Authors
Richard A. Schweickert, M.M. Lahren, K.D. Smith, J. F. Howle, G. Ichinose
Determination of specific yield and water-table changes using temporal microgravity surveys collected during the second injection, storage, and recovery test at Lancaster, Antelope Valley, California, November 1996 through April 1997
To evaluate the feasibility of artificially recharging the ground-water system in the Lancaster area of the Antelope Valley, California, the U.S. Geological Survey, in cooperation with the Los Angeles County Department of Public Works and the Antelope Valley-East Kern Water Agency, conducted a series of injection, storage, and recovery tests between September 1995 and September 1998. A key compone
Authors
James F. Howle, Steven P. Phillips, Roger P. Denlinger, Loren F. Metzger
Water-level changes induced by local and distant earthquakes at Long Valley caldera, California
Distant as well as local earthquakes have induced groundwater-level changes persisting for days to weeks at Long Valley caldera, California. Four wells open to formations as deep as 300 m have responded to 16 earthquakes, and responses to two earthquakes in the 3-km-deep Long Valley Exploratory Well (LVEW) show that these changes are not limited to weathered or unconsolidated near-surface rocks. A
Authors
Evelyn A. Roeloffs, Michelle Sneed, Devin L. Galloway, Michael L. Sorey, Christopher D. Farrar, James F. Howle, J. Hughes
The Long Valley Caldera GIS database
This database provides an overview of the studies being conducted by the Long Valley Observatory in eastern California from 1975 to 2001. The database includes geologic, monitoring, and topographic datasets related to Long Valley caldera. The CD-ROM contains a scan of the original geologic map of the Long Valley region by R. Bailey. Real-time data of the current activity of the caldera (including
Authors
Maurizio Battaglia, M.J. Williams, D.Y. Venezky, D. P. Hill, John O. Langbein, Christopher D. Farrar, James F. Howle, Michelle Sneed, P. Segall
Inferences on the hydrothermal system beneath the resurgent dome in Long Valley Caldera, east-central California, USA, from recent pumping tests and geochemical sampling
Quaternary volcanic unrest has provided heat for episodic hydrothermal circulation in the Long Valley caldera, including the present-day hydrothermal system, which has been active over the past 40 kyr. The most recent period of crustal unrest in this region of east-central California began around 1980 and has included periods of intense seismicity and ground deformation. Uplift totaling more than
Authors
C. D. Farrar, M. L. Sorey, E. Roeloffs, D. L. Galloway, J. F. Howle, R. Jacobson
Deformation near the Casa Diablo geothermal well field and related processes Long Valley caldera, Eastern California, 1993-2000
Regional first-order leveling lines, which extend from Lee Vining, CA, to Tom's Place, CA, have been surveyed periodically since 1957 by the U.S. Geological Survey (USGS), the National Geodetic Survey (NGS), and Caltrans. Two of the regional survey lines, or leveling networks, intersect at the Casa Diablo geothermal well field. These leveling networks, referenced to a distant bench mark (C916) nea
Authors
J. F. Howle, J. O. Langbein, C. D. Farrar, S.K. Wilkinson
Analysis of tests of subsurface injection, storage, and recovery of freshwater in Lancaster, Antelope Valley, California
Ground-water levels in Lancaster, California, declined more than 200 feet during the 20th century, resulting in reduced ground-water supplies and more than 6 feet of land subsidence. Facing continuing population growth, water managers are seeking solutions to these problems. Injection of imported, treated fresh water into the aquifer system when it is most available and least expensive, for later
Authors
Steven P. Phillips, Carl S. Carlson, Loren F. Metzger, James F. Howle, Devin L. Galloway, Michelle Sneed, Marti E. Ikehara, Kenneth W. Hudnut, Nancy E. King
Estimating water-table change using microgravity surveys during an ASR program in Lancaster, California
No abstract available.
Authors
J. F. Howle, S.P. Phillips, M. E. Ikehara, P.J. Dillon
Science and Products
Filter Total Items: 29
LiDAR-Assisted identification of an active fault near Truckee, California
We use high-resolution (1.5-2.4 points/m2) bare-earth airborne Light Detection and Ranging (LiDAR) imagery to identify, map, constrain, and visualize fault-related geomorphology in densely vegetated terrain surrounding Martis Creek Dam near Truckee, California. Bare-earth LiDAR imagery reveals a previously unrecognized and apparently youthful right-lateral strike-slip fault that exhibits laterally
Authors
L. E. Hunter, J. F. Howle, R.S. Rose, G.W. Bawden
Monitoring land-surface deformation on Bicycle Lake playa, Fort Irwin, California, USA
No abstract available.
Authors
Jill N. Densmore, Kevin Ellett, James F. Howle, Michael C. Carpenter, Michelle Sneed
Carbon dioxide emissions from vegetation-kill zones around the resurgent dome of Long Valley caldera, eastern California, USA
A survey of diffuse CO2 efflux, soil temperature and soil-gas chemistry over areas of localized vegetation-kill on and around the resurgent dome of Long Valley caldera California was performed to evaluate the premise that gaseous and thermal anomalies are related to renewed intrusion of magma. Some kill sites are long-lived features and others have developed in the past few years. Total anomalous
Authors
Deborah Bergfeld, William C. Evans, James F. Howle, Christopher D. Farrar
Transtensional deformation in the Lake Tahoe region, California and Nevada, USA
Dextral transtensional deformation is occurring along the Sierra Nevada–Great Basin boundary zone (SNGBBZ) at the eastern edge of the Sierra Nevada microplate. In the Lake Tahoe region of the SNGBBZ, transtension is partitioned spatially and temporally into domains of north–south striking normal faults and transitional domains with conjugate strike-slip faults. The normal fault domains, which have
Authors
Richard A. Schweickert, M.M. Lahren, K.D. Smith, J. F. Howle, G. Ichinose
Determination of specific yield and water-table changes using temporal microgravity surveys collected during the second injection, storage, and recovery test at Lancaster, Antelope Valley, California, November 1996 through April 1997
To evaluate the feasibility of artificially recharging the ground-water system in the Lancaster area of the Antelope Valley, California, the U.S. Geological Survey, in cooperation with the Los Angeles County Department of Public Works and the Antelope Valley-East Kern Water Agency, conducted a series of injection, storage, and recovery tests between September 1995 and September 1998. A key compone
Authors
James F. Howle, Steven P. Phillips, Roger P. Denlinger, Loren F. Metzger
Water-level changes induced by local and distant earthquakes at Long Valley caldera, California
Distant as well as local earthquakes have induced groundwater-level changes persisting for days to weeks at Long Valley caldera, California. Four wells open to formations as deep as 300 m have responded to 16 earthquakes, and responses to two earthquakes in the 3-km-deep Long Valley Exploratory Well (LVEW) show that these changes are not limited to weathered or unconsolidated near-surface rocks. A
Authors
Evelyn A. Roeloffs, Michelle Sneed, Devin L. Galloway, Michael L. Sorey, Christopher D. Farrar, James F. Howle, J. Hughes
The Long Valley Caldera GIS database
This database provides an overview of the studies being conducted by the Long Valley Observatory in eastern California from 1975 to 2001. The database includes geologic, monitoring, and topographic datasets related to Long Valley caldera. The CD-ROM contains a scan of the original geologic map of the Long Valley region by R. Bailey. Real-time data of the current activity of the caldera (including
Authors
Maurizio Battaglia, M.J. Williams, D.Y. Venezky, D. P. Hill, John O. Langbein, Christopher D. Farrar, James F. Howle, Michelle Sneed, P. Segall
Inferences on the hydrothermal system beneath the resurgent dome in Long Valley Caldera, east-central California, USA, from recent pumping tests and geochemical sampling
Quaternary volcanic unrest has provided heat for episodic hydrothermal circulation in the Long Valley caldera, including the present-day hydrothermal system, which has been active over the past 40 kyr. The most recent period of crustal unrest in this region of east-central California began around 1980 and has included periods of intense seismicity and ground deformation. Uplift totaling more than
Authors
C. D. Farrar, M. L. Sorey, E. Roeloffs, D. L. Galloway, J. F. Howle, R. Jacobson
Deformation near the Casa Diablo geothermal well field and related processes Long Valley caldera, Eastern California, 1993-2000
Regional first-order leveling lines, which extend from Lee Vining, CA, to Tom's Place, CA, have been surveyed periodically since 1957 by the U.S. Geological Survey (USGS), the National Geodetic Survey (NGS), and Caltrans. Two of the regional survey lines, or leveling networks, intersect at the Casa Diablo geothermal well field. These leveling networks, referenced to a distant bench mark (C916) nea
Authors
J. F. Howle, J. O. Langbein, C. D. Farrar, S.K. Wilkinson
Analysis of tests of subsurface injection, storage, and recovery of freshwater in Lancaster, Antelope Valley, California
Ground-water levels in Lancaster, California, declined more than 200 feet during the 20th century, resulting in reduced ground-water supplies and more than 6 feet of land subsidence. Facing continuing population growth, water managers are seeking solutions to these problems. Injection of imported, treated fresh water into the aquifer system when it is most available and least expensive, for later
Authors
Steven P. Phillips, Carl S. Carlson, Loren F. Metzger, James F. Howle, Devin L. Galloway, Michelle Sneed, Marti E. Ikehara, Kenneth W. Hudnut, Nancy E. King
Estimating water-table change using microgravity surveys during an ASR program in Lancaster, California
No abstract available.
Authors
J. F. Howle, S.P. Phillips, M. E. Ikehara, P.J. Dillon