Victoria Langenheim
Vickie is a Research Geophysicist with the Geology, Minerals, Energy, and Geophysics Science Center
Science and Products
Filter Total Items: 22
No Result Found
Filter Total Items: 186
Isostatic residual gravity map of The Santa Clara Valley and vicinity, California
No abstract available.
Authors
Carter W. Roberts, Robert C. Jachens, David A. Ponce, Victoria E. Langenheim
The offshore Palos Verdes fault zone near San Pedro, Southern California
High-resolution seismic-reflection data are combined with a variety of other geophysical and geological data to interpret the offshore structure and earthquake hazards of the San Pedro shelf, near Los Angeles, California. Prominent structures investigated include the Wilmington graben, the Palos Verdes fault zone, various faults below the west part of the San Pedro shelf and slope, and the deep-wa
Authors
M. A. Fisher, W. R. Normark, V. E. Langenheim, A.J. Calvert, R. Sliter
Upper crustal structure from the Santa Monica Mountains to the Sierra Nevada, Southern California: Tomographic results from the Los Angeles Regional Seismic Experiment, Phase II (LARSE II)
In 1999, the U.S. Geological Survey and the Southern California Earthquake Center (SCEC) collected refraction and low-fold reflection data along a 150-km-long corridor extending from the Santa Monica Mountains northward to the Sierra Nevada. This profile was part of the second phase of the Los Angeles Region Seismic Experiment (LARSE II). Chief imaging targets included sedimentary basins beneath t
Authors
W. J. Lutter, G. S. Fuis, T. Ryberg, D. A. Okaya, R.W. Clayton, P.M. Davis, C. Prodehl, J.M. Murphy, V. E. Langenheim, M.L. Benthien, N. J. Godfrey, N.I. Christensen, K. Thygesen, C.H. Thurber, G. Simila, Gordon R. Keller
Geophysical and isotopic mapping of preexisting crustal structures that influenced the location and development of the San Jacinto fault zone, southern California
We examine the role of preexisting crustal structure within the Peninsular Ranges batholith on determining the location of the San Jacinto fault zone by analysis of geophysical anomalies and initial strontium ratio data. A 1000-km-long boundary within the Peninsular Ranges batholith, separating relatively mafic, dense, and magnetic rocks of the western Peninsular Ranges batholith from the more fel
Authors
V. E. Langenheim, R.C. Jachens, D. M. Morton, R. W. Kistler, J. C. Matti
Isostatic gravity map with simplified geology of the Los Angeles 30 x 60 minute quadrangle
This isostatic residual gravity map is part of the Southern California Areal Mapping Project (SCAMP) and is intended to promote further understanding of the geology in the Los Angeles 30 x 60 minute quadrangle, California, by serving as a basis for geophysical interpretations and by supporting both geological mapping and topical (especially earthquake) studies. Local spatial variations in the Eart
Authors
R .J. Wooley, R.F. Yerkes, V. E. Langenheim, F. C. Chuang
Crustal structure of the Peninsular Ranges batholith from magnetic data: Implications for Gulf of California rifting
A 70-km-wide belt of magnetic highs extends ???1200 km northwest from the southern tip of the Baja California peninsula into southern California. The anomalies are caused by the mafic western belt of the Peninsular Ranges batholith, which is exposed extensively along the northern 800 km length of the magnetic belt. Modeling indicates that the source of the anomalies extends to mid-to lower crustal
Authors
V. E. Langenheim, R.C. Jachens
Isostatic gravity map of the Monterey 30' x 60' quadrangle and adjacent areas, California
The digital dataset consists of one file (monterey_100k.iso) containing 2,385 gravity stations. The file, monterey_100k.iso, contains the principal facts of the gravity stations, with one point coded per line. The format of the data is described below.
Each gravity station has a station name, location (latitude and longitude, NAD27 projection), elevation, and an observed gravity reading. The data
Authors
V. E. Langenheim, S. R. Stiles, R.C. Jachens
Preliminary report on geophysical data in Yavapai County, Arizona
Recently acquired geophysical data provide information on the geologic framework and its effect of groundwater flow and on stream/aquifer interaction in Yavapai County, Arizona. High-resolution aeromagnetic data reflect diverse rock types at and below the topographic surface and have permitted a preliminary interpretation of faults and underlying rock types (in particular, volcanic) that will prov
Authors
V. E. Langenheim, J.P. Hoffmann, K.W. Blasch, Ed DeWitt, Laurie Wirt
Aeromagnetic Expression of Buried Basaltic Volcanoes Near Yucca Mountain, Nevada
A high-resolution aeromagnetic survey has defined a number of small dipolar anomalies indicating the presence of magnetic bodies buried beneath the surface of Crater Flat and the Amargosa Desert. Results of potential-field modeling indicate that isolated, small-volume, highly magnetic bodies embedded within the alluvial deposits of both areas produce the anomalies. Their physical characteristics a
Authors
Dennis W. O'Leary, E. A. Mankinen, R. J. Blakely, V. E. Langenheim, D. A. Ponce
Relationship of the 1999 Hector Mine and 1992 Landers fault ruptures to offsets on neogene faults and distribution of late Cenozoic basins in the eastern California shear zone
This report examines the Hector Mine and Landers earthquakes in the broader context of faults and fault-related basins of the eastern California shear zone (ECSZ). We compile new estimates of total strike-slip offset (horizontal separation) at nearly 30 fault sites based on offset magnetic anomaly pairs. We also present a map of the depth to pre-Cenozoic basement rock (thickness of basin-filling l
Authors
R.C. Jachens, V. E. Langenheim, J. C. Matti
The Emerson Lake Body: A link between the Landers and Hector Mine earthquakes, southern California, as inferred from gravity and magnetic anomalies
Gravity and magnetic data indicate a mafic crustal heterogeneity that lies between the Hector Mine 16 October 1999 (Mw 7.1) and Landers 28 June 1992 (Mw 7.3) epicenters. The aftershocks and ruptures of these two events avoided the interior of the body. Two- and three-dimensional modeling of the potential-field anomalies shows that the source, here named the Emerson Lake body (ELB), extends to a de
Authors
V. E. Langenheim, R.C. Jachens
Lower crustal deformation beneath the central Transverse Ranges, southern California: Results from the Los Angeles Region Seismic Experiment
We present a P wave velocity model derived from active source seismic data collected during the 1994 Los Angeles Region Seismic Experiment. Our model extends previously published upper crustal velocity models to mantle depths. Our model was developed by both ray tracing through a layered model and calculating travel times through a gridded model. It includes an 8-km-thick crustal root centered ben
Authors
N. J. Godfrey, Gary S. Fuis, Victoria E. Langenheim, David A. Okaya, Thomas M. Brocher
Science and Products
Filter Total Items: 22
No Result Found
Filter Total Items: 186
Isostatic residual gravity map of The Santa Clara Valley and vicinity, California
No abstract available.
Authors
Carter W. Roberts, Robert C. Jachens, David A. Ponce, Victoria E. Langenheim
The offshore Palos Verdes fault zone near San Pedro, Southern California
High-resolution seismic-reflection data are combined with a variety of other geophysical and geological data to interpret the offshore structure and earthquake hazards of the San Pedro shelf, near Los Angeles, California. Prominent structures investigated include the Wilmington graben, the Palos Verdes fault zone, various faults below the west part of the San Pedro shelf and slope, and the deep-wa
Authors
M. A. Fisher, W. R. Normark, V. E. Langenheim, A.J. Calvert, R. Sliter
Upper crustal structure from the Santa Monica Mountains to the Sierra Nevada, Southern California: Tomographic results from the Los Angeles Regional Seismic Experiment, Phase II (LARSE II)
In 1999, the U.S. Geological Survey and the Southern California Earthquake Center (SCEC) collected refraction and low-fold reflection data along a 150-km-long corridor extending from the Santa Monica Mountains northward to the Sierra Nevada. This profile was part of the second phase of the Los Angeles Region Seismic Experiment (LARSE II). Chief imaging targets included sedimentary basins beneath t
Authors
W. J. Lutter, G. S. Fuis, T. Ryberg, D. A. Okaya, R.W. Clayton, P.M. Davis, C. Prodehl, J.M. Murphy, V. E. Langenheim, M.L. Benthien, N. J. Godfrey, N.I. Christensen, K. Thygesen, C.H. Thurber, G. Simila, Gordon R. Keller
Geophysical and isotopic mapping of preexisting crustal structures that influenced the location and development of the San Jacinto fault zone, southern California
We examine the role of preexisting crustal structure within the Peninsular Ranges batholith on determining the location of the San Jacinto fault zone by analysis of geophysical anomalies and initial strontium ratio data. A 1000-km-long boundary within the Peninsular Ranges batholith, separating relatively mafic, dense, and magnetic rocks of the western Peninsular Ranges batholith from the more fel
Authors
V. E. Langenheim, R.C. Jachens, D. M. Morton, R. W. Kistler, J. C. Matti
Isostatic gravity map with simplified geology of the Los Angeles 30 x 60 minute quadrangle
This isostatic residual gravity map is part of the Southern California Areal Mapping Project (SCAMP) and is intended to promote further understanding of the geology in the Los Angeles 30 x 60 minute quadrangle, California, by serving as a basis for geophysical interpretations and by supporting both geological mapping and topical (especially earthquake) studies. Local spatial variations in the Eart
Authors
R .J. Wooley, R.F. Yerkes, V. E. Langenheim, F. C. Chuang
Crustal structure of the Peninsular Ranges batholith from magnetic data: Implications for Gulf of California rifting
A 70-km-wide belt of magnetic highs extends ???1200 km northwest from the southern tip of the Baja California peninsula into southern California. The anomalies are caused by the mafic western belt of the Peninsular Ranges batholith, which is exposed extensively along the northern 800 km length of the magnetic belt. Modeling indicates that the source of the anomalies extends to mid-to lower crustal
Authors
V. E. Langenheim, R.C. Jachens
Isostatic gravity map of the Monterey 30' x 60' quadrangle and adjacent areas, California
The digital dataset consists of one file (monterey_100k.iso) containing 2,385 gravity stations. The file, monterey_100k.iso, contains the principal facts of the gravity stations, with one point coded per line. The format of the data is described below.
Each gravity station has a station name, location (latitude and longitude, NAD27 projection), elevation, and an observed gravity reading. The data
Authors
V. E. Langenheim, S. R. Stiles, R.C. Jachens
Preliminary report on geophysical data in Yavapai County, Arizona
Recently acquired geophysical data provide information on the geologic framework and its effect of groundwater flow and on stream/aquifer interaction in Yavapai County, Arizona. High-resolution aeromagnetic data reflect diverse rock types at and below the topographic surface and have permitted a preliminary interpretation of faults and underlying rock types (in particular, volcanic) that will prov
Authors
V. E. Langenheim, J.P. Hoffmann, K.W. Blasch, Ed DeWitt, Laurie Wirt
Aeromagnetic Expression of Buried Basaltic Volcanoes Near Yucca Mountain, Nevada
A high-resolution aeromagnetic survey has defined a number of small dipolar anomalies indicating the presence of magnetic bodies buried beneath the surface of Crater Flat and the Amargosa Desert. Results of potential-field modeling indicate that isolated, small-volume, highly magnetic bodies embedded within the alluvial deposits of both areas produce the anomalies. Their physical characteristics a
Authors
Dennis W. O'Leary, E. A. Mankinen, R. J. Blakely, V. E. Langenheim, D. A. Ponce
Relationship of the 1999 Hector Mine and 1992 Landers fault ruptures to offsets on neogene faults and distribution of late Cenozoic basins in the eastern California shear zone
This report examines the Hector Mine and Landers earthquakes in the broader context of faults and fault-related basins of the eastern California shear zone (ECSZ). We compile new estimates of total strike-slip offset (horizontal separation) at nearly 30 fault sites based on offset magnetic anomaly pairs. We also present a map of the depth to pre-Cenozoic basement rock (thickness of basin-filling l
Authors
R.C. Jachens, V. E. Langenheim, J. C. Matti
The Emerson Lake Body: A link between the Landers and Hector Mine earthquakes, southern California, as inferred from gravity and magnetic anomalies
Gravity and magnetic data indicate a mafic crustal heterogeneity that lies between the Hector Mine 16 October 1999 (Mw 7.1) and Landers 28 June 1992 (Mw 7.3) epicenters. The aftershocks and ruptures of these two events avoided the interior of the body. Two- and three-dimensional modeling of the potential-field anomalies shows that the source, here named the Emerson Lake body (ELB), extends to a de
Authors
V. E. Langenheim, R.C. Jachens
Lower crustal deformation beneath the central Transverse Ranges, southern California: Results from the Los Angeles Region Seismic Experiment
We present a P wave velocity model derived from active source seismic data collected during the 1994 Los Angeles Region Seismic Experiment. Our model extends previously published upper crustal velocity models to mantle depths. Our model was developed by both ray tracing through a layered model and calculating travel times through a gridded model. It includes an 8-km-thick crustal root centered ben
Authors
N. J. Godfrey, Gary S. Fuis, Victoria E. Langenheim, David A. Okaya, Thomas M. Brocher