V. J. Grauch
V. J. S. ("Tien") Grauch has been employed by the U.S. Geological Survey in Denver, Colorado since 1977, where she is currently a Scientist Emeritus (senior research geophysicist) with the Geology, Geophysics, and Geochemistry Science Center.
Her research interests include application of high-resolution aeromagnetic data to map intrasedimentary faults, integration of geologic and geophysical data to develop 3D geologic and hydrogeologic frameworks, the relation between magnetic sources and geology, interpretation of aeromagnetic data over rugged magnetic terrain, and development of new interpretation methods.
Education and Certifications
PhD (1986) in geophysics from Colorado School of Mines
BA (1975) in geology from Carleton College
Science and Products
Filter Total Items: 99
Digital Aeromagnetic Data and Derivative Products from a Helicopter Survey over the Town of Taos and Surrounding Areas, Taos County, New Mexico Digital Aeromagnetic Data and Derivative Products from a Helicopter Survey over the Town of Taos and Surrounding Areas, Taos County, New Mexico
This report contains digital data, image files, and text files describing data formats and survey procedures for aeromagnetic data collected during a helicopter geophysical survey in northern New Mexico during October 2003. The survey covers the Town of Taos, Taos Pueblo, and surrounding communities in Taos County. Several derivative products from these data are also presented, including...
Authors
Viki Bankey, V. J. S. Grauch
Thickness of Santa Fe Group sediments in the Espanola Basin south of Santa Fe, New Mexico, as estimated from aeromagnetic data Thickness of Santa Fe Group sediments in the Espanola Basin south of Santa Fe, New Mexico, as estimated from aeromagnetic data
In the southern Espa?ola basin south of Santa Fe, New Mexico, weakly magnetic Santa Fe Group sediments of Oligocene to Pleistocene age, which represent the primary aquifers for the region, are locally underlain by moderately to strongly magnetic igneous and volcaniclastic rocks of Oligocene age. Where this relationship exists, the thickness of Santa Fe Group sediments, and thus the...
Authors
Jeffrey D. Phillips, V. J. S. Grauch
Aeromagnetic interpretations for understanding the hydrogeologic framework of the southern Espanola Basin, New Mexico Aeromagnetic interpretations for understanding the hydrogeologic framework of the southern Espanola Basin, New Mexico
No abstract available.
Authors
V. J. S. Grauch, Viki Bankey
Geophysical and isotopic constraints on crustal structure related to mineral trends in north-central Nevada and implications for tectonic history Geophysical and isotopic constraints on crustal structure related to mineral trends in north-central Nevada and implications for tectonic history
We combined information from Sr and Pb isotope data and magnetotelluric models to develop a new magnetic and gravity interpretation of the crustal structure of north-central Nevada to better understand the origin of mineral trends. The new interpretation suggests a crustal structure that is composed of Precambrian continental crust, transitional crust, and primarily oceanic crust that...
Authors
V. J. S. Grauch, B. D. Rodriguez, J. L. Wooden
Evidence for a Battle Mountain-Eureka crustal fault zone, north-central Nevada, and its relation to Neoproterozoic-Early Paleozoic continental breakup Evidence for a Battle Mountain-Eureka crustal fault zone, north-central Nevada, and its relation to Neoproterozoic-Early Paleozoic continental breakup
Combined evidence from gravity, radiogenic isotope, and magnetotelluric (MT) data indicates a crustal fault zone that coincides with the northwest-trending Battle Mountain-Eureka (BME) mineral trend in north-central Nevada, USA. The BME crustal fault zone likely originated during Neoproterozoic-Early Paleozoic rifting of the continent and had a large influence on subsequent tectonic...
Authors
V. J. S. Grauch, B. D. Rodriguez, V. Bankey, J. L. Wooden
Paleomagnetic evidence for a Tertiary not Triassic age for rocks in the lower part of the Grober-Fuqua #1 well, southeastern Albuquerque Basin, New Mexico Paleomagnetic evidence for a Tertiary not Triassic age for rocks in the lower part of the Grober-Fuqua #1 well, southeastern Albuquerque Basin, New Mexico
A sedimentary sequence penetrated in the lower part of the Grober-Fuqua #1 well in the southeastern Albuquerque Basin has previously been interpreted as either Triassic or Eocene in age. Paleomagnetic study of three specimens from two core fragments yielded a 54.5?? mean inclination of remanent magnetization relative to bedding. This inclination is like that expected in Tertiary time and...
Authors
M.R. Hudson, V. J. S. Grauch
Deep crustal controls on mineral trends Deep crustal controls on mineral trends
No abstract available.
Authors
A.E.J. Crafford, V. J. S. Grauch
Merged digital aeromagnetic data for the middle Rio Grande and southern Espanola basins, New Mexico Merged digital aeromagnetic data for the middle Rio Grande and southern Espanola basins, New Mexico
The U. S. Geological Survey (USGS) recently conducted a multi-disciplinary study of the Middle Rio Grande basin (Bartolino and Cole, 2002; Fig. 1). The main purpose of this study was to gain a better multi-dimensional understanding of the basin's hydrogeologic framework and use this new understanding to construct an improved regional ground-water flow model. The Middle Rio Grande basin...
Authors
Ronald E. Sweeney, V. J. S. Grauch, Jeffrey D. Phillips
Geologic and geophysical evidence for the influence of deep crustal structures on Paleozoic tectonics and the alignment of world-class gold deposits, north-central Nevada, USA Geologic and geophysical evidence for the influence of deep crustal structures on Paleozoic tectonics and the alignment of world-class gold deposits, north-central Nevada, USA
Geologic data concur with geophysical and isotopic data that suggest the presence of deep crustal fault zones along the Battle Mountain-Eureka (BME) trend and elsewhere in Nevada. The fault zones may have originated during Proterozoic rifting of the continent and were likely substantially reactivated and modified during Paleozoic tectonism. Five distinct Paleozoic structural and...
Authors
A.E.J. Crafford, V. J. S. Grauch
Preliminary Results of a High-Resolution Aeromagnetic Survey to Identify Buried Faults at Dixie Valley, Nevada Preliminary Results of a High-Resolution Aeromagnetic Survey to Identify Buried Faults at Dixie Valley, Nevada
Preliminary results from a high-resolution aeromagnetic survey (200 m line spacing) acquired in Dixie Valley early in 2002 provide confirmation of intra-basin faulting based on subtle surface indications. In addition the data allow identification of the locations and trends of many faults that have not been recognized at the surface, and provide a picture of intrabasin faulting patterns...
Authors
R.P. Smith, V. J. S. Grauch, D.D. Blackwell
Using high-resolution aeromagnetic surveys to map subsurface hydrogeology in sediment-filled basins: A case study over the Rio Grande Rift, Central New Mexico, USA Using high-resolution aeromagnetic surveys to map subsurface hydrogeology in sediment-filled basins: A case study over the Rio Grande Rift, Central New Mexico, USA
High-resolution aeromagnetic surveys were acquired for the Albuquerque basin in the central Rio Grande rift, a basin filled with poorly consolidated sediments. The surveys proved successful in efficiently and economically mapping previously unknown hydrogeologic features of the shallow subsurface. This success suggests that aeromagnetic methods may be useful in hydrogeologic studies of...
Authors
V. J. S. Grauch
Science and Products
Filter Total Items: 99
Digital Aeromagnetic Data and Derivative Products from a Helicopter Survey over the Town of Taos and Surrounding Areas, Taos County, New Mexico Digital Aeromagnetic Data and Derivative Products from a Helicopter Survey over the Town of Taos and Surrounding Areas, Taos County, New Mexico
This report contains digital data, image files, and text files describing data formats and survey procedures for aeromagnetic data collected during a helicopter geophysical survey in northern New Mexico during October 2003. The survey covers the Town of Taos, Taos Pueblo, and surrounding communities in Taos County. Several derivative products from these data are also presented, including...
Authors
Viki Bankey, V. J. S. Grauch
Thickness of Santa Fe Group sediments in the Espanola Basin south of Santa Fe, New Mexico, as estimated from aeromagnetic data Thickness of Santa Fe Group sediments in the Espanola Basin south of Santa Fe, New Mexico, as estimated from aeromagnetic data
In the southern Espa?ola basin south of Santa Fe, New Mexico, weakly magnetic Santa Fe Group sediments of Oligocene to Pleistocene age, which represent the primary aquifers for the region, are locally underlain by moderately to strongly magnetic igneous and volcaniclastic rocks of Oligocene age. Where this relationship exists, the thickness of Santa Fe Group sediments, and thus the...
Authors
Jeffrey D. Phillips, V. J. S. Grauch
Aeromagnetic interpretations for understanding the hydrogeologic framework of the southern Espanola Basin, New Mexico Aeromagnetic interpretations for understanding the hydrogeologic framework of the southern Espanola Basin, New Mexico
No abstract available.
Authors
V. J. S. Grauch, Viki Bankey
Geophysical and isotopic constraints on crustal structure related to mineral trends in north-central Nevada and implications for tectonic history Geophysical and isotopic constraints on crustal structure related to mineral trends in north-central Nevada and implications for tectonic history
We combined information from Sr and Pb isotope data and magnetotelluric models to develop a new magnetic and gravity interpretation of the crustal structure of north-central Nevada to better understand the origin of mineral trends. The new interpretation suggests a crustal structure that is composed of Precambrian continental crust, transitional crust, and primarily oceanic crust that...
Authors
V. J. S. Grauch, B. D. Rodriguez, J. L. Wooden
Evidence for a Battle Mountain-Eureka crustal fault zone, north-central Nevada, and its relation to Neoproterozoic-Early Paleozoic continental breakup Evidence for a Battle Mountain-Eureka crustal fault zone, north-central Nevada, and its relation to Neoproterozoic-Early Paleozoic continental breakup
Combined evidence from gravity, radiogenic isotope, and magnetotelluric (MT) data indicates a crustal fault zone that coincides with the northwest-trending Battle Mountain-Eureka (BME) mineral trend in north-central Nevada, USA. The BME crustal fault zone likely originated during Neoproterozoic-Early Paleozoic rifting of the continent and had a large influence on subsequent tectonic...
Authors
V. J. S. Grauch, B. D. Rodriguez, V. Bankey, J. L. Wooden
Paleomagnetic evidence for a Tertiary not Triassic age for rocks in the lower part of the Grober-Fuqua #1 well, southeastern Albuquerque Basin, New Mexico Paleomagnetic evidence for a Tertiary not Triassic age for rocks in the lower part of the Grober-Fuqua #1 well, southeastern Albuquerque Basin, New Mexico
A sedimentary sequence penetrated in the lower part of the Grober-Fuqua #1 well in the southeastern Albuquerque Basin has previously been interpreted as either Triassic or Eocene in age. Paleomagnetic study of three specimens from two core fragments yielded a 54.5?? mean inclination of remanent magnetization relative to bedding. This inclination is like that expected in Tertiary time and...
Authors
M.R. Hudson, V. J. S. Grauch
Deep crustal controls on mineral trends Deep crustal controls on mineral trends
No abstract available.
Authors
A.E.J. Crafford, V. J. S. Grauch
Merged digital aeromagnetic data for the middle Rio Grande and southern Espanola basins, New Mexico Merged digital aeromagnetic data for the middle Rio Grande and southern Espanola basins, New Mexico
The U. S. Geological Survey (USGS) recently conducted a multi-disciplinary study of the Middle Rio Grande basin (Bartolino and Cole, 2002; Fig. 1). The main purpose of this study was to gain a better multi-dimensional understanding of the basin's hydrogeologic framework and use this new understanding to construct an improved regional ground-water flow model. The Middle Rio Grande basin...
Authors
Ronald E. Sweeney, V. J. S. Grauch, Jeffrey D. Phillips
Geologic and geophysical evidence for the influence of deep crustal structures on Paleozoic tectonics and the alignment of world-class gold deposits, north-central Nevada, USA Geologic and geophysical evidence for the influence of deep crustal structures on Paleozoic tectonics and the alignment of world-class gold deposits, north-central Nevada, USA
Geologic data concur with geophysical and isotopic data that suggest the presence of deep crustal fault zones along the Battle Mountain-Eureka (BME) trend and elsewhere in Nevada. The fault zones may have originated during Proterozoic rifting of the continent and were likely substantially reactivated and modified during Paleozoic tectonism. Five distinct Paleozoic structural and...
Authors
A.E.J. Crafford, V. J. S. Grauch
Preliminary Results of a High-Resolution Aeromagnetic Survey to Identify Buried Faults at Dixie Valley, Nevada Preliminary Results of a High-Resolution Aeromagnetic Survey to Identify Buried Faults at Dixie Valley, Nevada
Preliminary results from a high-resolution aeromagnetic survey (200 m line spacing) acquired in Dixie Valley early in 2002 provide confirmation of intra-basin faulting based on subtle surface indications. In addition the data allow identification of the locations and trends of many faults that have not been recognized at the surface, and provide a picture of intrabasin faulting patterns...
Authors
R.P. Smith, V. J. S. Grauch, D.D. Blackwell
Using high-resolution aeromagnetic surveys to map subsurface hydrogeology in sediment-filled basins: A case study over the Rio Grande Rift, Central New Mexico, USA Using high-resolution aeromagnetic surveys to map subsurface hydrogeology in sediment-filled basins: A case study over the Rio Grande Rift, Central New Mexico, USA
High-resolution aeromagnetic surveys were acquired for the Albuquerque basin in the central Rio Grande rift, a basin filled with poorly consolidated sediments. The surveys proved successful in efficiently and economically mapping previously unknown hydrogeologic features of the shallow subsurface. This success suggests that aeromagnetic methods may be useful in hydrogeologic studies of...
Authors
V. J. S. Grauch