Bruce D Smith (Former Employee)
Science and Products
Airborne Electromagnetic (AEM) Survey Inventory Airborne Electromagnetic (AEM) Survey Inventory
The U.S. Geological Survey (USGS) has been engaged in airborne electromagnetics (AEM) since the 1970s, playing a role in the development of early acquisition systems, developing calibration methods, refining standards for data acquisition, improving data processing, modeling, and interpretation methods, and expanding the range of AEM applications. However, USGS AEM survey visibility and...
High resolution helicopter-borne magnetic and electromagnetic survey Eureka Graben area, Colorado September 1999 High resolution helicopter-borne magnetic and electromagnetic survey Eureka Graben area, Colorado September 1999
On September 25, 1998, SIAL Gosciences Inc. (SIAL) was awarded Department of Interior, contract 98CRCN1018, by the U.S. Geological Survey. This contract required SIAL to carry out a high-sensitivity magnetic and electromagnetic helicopter survey over one block located in the Eureka Graben Area near Silverton, Colorado. The primary goal of this project was to provide digitally recorded...
Airborne electromagnetic and magnetic survey data, Big Sioux aquifer, October 2015, Sioux Falls, South Dakota Airborne electromagnetic and magnetic survey data, Big Sioux aquifer, October 2015, Sioux Falls, South Dakota
Airborne electromagnetic (AEM) and magnetic survey data were collected during October 2015 along 769 line-kilometers over a 160-square-kilometer area that includes the Big Sioux aquifer between Sioux Falls and Dell Rapids, South Dakota, USA. Data were acquired with the CGG Resolve frequency-domain helicopter-borne electromagnetic system along with a cesium vapor magnetometer. Files...
Airborne electromagnetic and magnetic survey data, East Poplar Oil Field and surrounding area, October 2014, Fort Peck Indian Reservation, Montana Airborne electromagnetic and magnetic survey data, East Poplar Oil Field and surrounding area, October 2014, Fort Peck Indian Reservation, Montana
Airborne electromagnetic (AEM) and magnetic survey data were collected during October 2014 in a 553-square-kilometer area that includes the East Poplar oil field on the Fort Peck Indian Reservation in northeastern Montana, USA. Data surround the town of Poplar and extend south into the Missouri River floodplain. Data were acquired with the SkyTEM301 transient electromagnetic helicopter...
Filter Total Items: 87
User’s guide for GcClust—An R package for clustering of regional geochemical data User’s guide for GcClust—An R package for clustering of regional geochemical data
GcClust is a software package developed by the U.S. Geological Survey for statistical clustering of regional geochemical data, and similar data such as regional mineralogical data. Functions within the software package are written in the R statistical programming language. These functions, their documentation, and a copy of the user’s guide are bundled together in R’s unit of sharable...
Authors
Karl J. Ellefsen, David B. Smith
Regional tectonic setting for the Trinidad earthquake swarms (2000-2012) from gravity and magnetic data Regional tectonic setting for the Trinidad earthquake swarms (2000-2012) from gravity and magnetic data
Earthquakes in the Raton basin near Trinidad, Colorado, (Figure 1) are located (Rubenstein et. al., 2014) near a major gravity and magnetic boundary. These earthquakes also occur in an area of hydrocarbon production that includes several high-capacity produced water injection wells. This presentation gives a very basic outline of the relation between the earthquakes, the potential field...
Authors
Carol A. Finn, Mason A. Kass, Bruce D. Smith
Changing migratory patterns in the Jackson elk herd Changing migratory patterns in the Jackson elk herd
Migratory behavior in ungulates has declined globally and understanding the causative factors (environmental change vs. human mediated) is needed to formulate effective management strategies. In the Jackson elk herd of northwest Wyoming, demographic differences between summer elk (Cervus elaphus) population segments have led to changes in migratory patterns over a 35-year time period...
Authors
Eric K. Cole, Aaron M. Foley, Jeffrey M. Warren, Bruce L. Smith, Sarah Dewey, Douglas G. Brimeyer, W. Sue Fairbanks, Hall Sawyer, Paul C. Cross
Airborne electromagnetic and magnetic survey data of the Paradox and San Luis Valleys, Colorado Airborne electromagnetic and magnetic survey data of the Paradox and San Luis Valleys, Colorado
In October 2011, the U.S. Geological Survey (USGS) contracted airborne magnetic and electromagnetic surveys of the Paradox and San Luis Valleys in southern Colorado, United States. These airborne geophysical surveys provide high-resolution and spatially comprehensive datasets characterizing the resistivity structure of the shallow subsurface of each survey region, accompanied by magnetic...
Authors
Lyndsay B. Ball, Benjamin R. Bloss, Paul A. Bedrosian, V. J. S. Grauch, Bruce D. Smith
A modified procedure for mixture-model clustering of regional geochemical data A modified procedure for mixture-model clustering of regional geochemical data
A modified procedure is proposed for mixture-model clustering of regional-scale geochemical data. The key modification is the robust principal component transformation of the isometric log-ratio transforms of the element concentrations. This principal component transformation and the associated dimension reduction are applied before the data are clustered. The principal advantage of this
Authors
Karl J. Ellefsen, David B. Smith, John D. Horton
USGS investigations of water produced during hydrocarbon reservoir development USGS investigations of water produced during hydrocarbon reservoir development
Significant quantities of water are present in hydrocarbon reservoirs. When brought to the land surface during oil, gas, and coalbed methane production, the water—either naturally occurring or injected as a method to enhance production—is termed produced water. Produced water is currently managed through processes such as recycling, treatment and discharge, spreading on roads...
Authors
Mark A. Engle, Isabelle M. Cozzarelli, Bruce D. Smith
Science and Products
Airborne Electromagnetic (AEM) Survey Inventory Airborne Electromagnetic (AEM) Survey Inventory
The U.S. Geological Survey (USGS) has been engaged in airborne electromagnetics (AEM) since the 1970s, playing a role in the development of early acquisition systems, developing calibration methods, refining standards for data acquisition, improving data processing, modeling, and interpretation methods, and expanding the range of AEM applications. However, USGS AEM survey visibility and...
High resolution helicopter-borne magnetic and electromagnetic survey Eureka Graben area, Colorado September 1999 High resolution helicopter-borne magnetic and electromagnetic survey Eureka Graben area, Colorado September 1999
On September 25, 1998, SIAL Gosciences Inc. (SIAL) was awarded Department of Interior, contract 98CRCN1018, by the U.S. Geological Survey. This contract required SIAL to carry out a high-sensitivity magnetic and electromagnetic helicopter survey over one block located in the Eureka Graben Area near Silverton, Colorado. The primary goal of this project was to provide digitally recorded...
Airborne electromagnetic and magnetic survey data, Big Sioux aquifer, October 2015, Sioux Falls, South Dakota Airborne electromagnetic and magnetic survey data, Big Sioux aquifer, October 2015, Sioux Falls, South Dakota
Airborne electromagnetic (AEM) and magnetic survey data were collected during October 2015 along 769 line-kilometers over a 160-square-kilometer area that includes the Big Sioux aquifer between Sioux Falls and Dell Rapids, South Dakota, USA. Data were acquired with the CGG Resolve frequency-domain helicopter-borne electromagnetic system along with a cesium vapor magnetometer. Files...
Airborne electromagnetic and magnetic survey data, East Poplar Oil Field and surrounding area, October 2014, Fort Peck Indian Reservation, Montana Airborne electromagnetic and magnetic survey data, East Poplar Oil Field and surrounding area, October 2014, Fort Peck Indian Reservation, Montana
Airborne electromagnetic (AEM) and magnetic survey data were collected during October 2014 in a 553-square-kilometer area that includes the East Poplar oil field on the Fort Peck Indian Reservation in northeastern Montana, USA. Data surround the town of Poplar and extend south into the Missouri River floodplain. Data were acquired with the SkyTEM301 transient electromagnetic helicopter...
Filter Total Items: 87
User’s guide for GcClust—An R package for clustering of regional geochemical data User’s guide for GcClust—An R package for clustering of regional geochemical data
GcClust is a software package developed by the U.S. Geological Survey for statistical clustering of regional geochemical data, and similar data such as regional mineralogical data. Functions within the software package are written in the R statistical programming language. These functions, their documentation, and a copy of the user’s guide are bundled together in R’s unit of sharable...
Authors
Karl J. Ellefsen, David B. Smith
Regional tectonic setting for the Trinidad earthquake swarms (2000-2012) from gravity and magnetic data Regional tectonic setting for the Trinidad earthquake swarms (2000-2012) from gravity and magnetic data
Earthquakes in the Raton basin near Trinidad, Colorado, (Figure 1) are located (Rubenstein et. al., 2014) near a major gravity and magnetic boundary. These earthquakes also occur in an area of hydrocarbon production that includes several high-capacity produced water injection wells. This presentation gives a very basic outline of the relation between the earthquakes, the potential field...
Authors
Carol A. Finn, Mason A. Kass, Bruce D. Smith
Changing migratory patterns in the Jackson elk herd Changing migratory patterns in the Jackson elk herd
Migratory behavior in ungulates has declined globally and understanding the causative factors (environmental change vs. human mediated) is needed to formulate effective management strategies. In the Jackson elk herd of northwest Wyoming, demographic differences between summer elk (Cervus elaphus) population segments have led to changes in migratory patterns over a 35-year time period...
Authors
Eric K. Cole, Aaron M. Foley, Jeffrey M. Warren, Bruce L. Smith, Sarah Dewey, Douglas G. Brimeyer, W. Sue Fairbanks, Hall Sawyer, Paul C. Cross
Airborne electromagnetic and magnetic survey data of the Paradox and San Luis Valleys, Colorado Airborne electromagnetic and magnetic survey data of the Paradox and San Luis Valleys, Colorado
In October 2011, the U.S. Geological Survey (USGS) contracted airborne magnetic and electromagnetic surveys of the Paradox and San Luis Valleys in southern Colorado, United States. These airborne geophysical surveys provide high-resolution and spatially comprehensive datasets characterizing the resistivity structure of the shallow subsurface of each survey region, accompanied by magnetic...
Authors
Lyndsay B. Ball, Benjamin R. Bloss, Paul A. Bedrosian, V. J. S. Grauch, Bruce D. Smith
A modified procedure for mixture-model clustering of regional geochemical data A modified procedure for mixture-model clustering of regional geochemical data
A modified procedure is proposed for mixture-model clustering of regional-scale geochemical data. The key modification is the robust principal component transformation of the isometric log-ratio transforms of the element concentrations. This principal component transformation and the associated dimension reduction are applied before the data are clustered. The principal advantage of this
Authors
Karl J. Ellefsen, David B. Smith, John D. Horton
USGS investigations of water produced during hydrocarbon reservoir development USGS investigations of water produced during hydrocarbon reservoir development
Significant quantities of water are present in hydrocarbon reservoirs. When brought to the land surface during oil, gas, and coalbed methane production, the water—either naturally occurring or injected as a method to enhance production—is termed produced water. Produced water is currently managed through processes such as recycling, treatment and discharge, spreading on roads...
Authors
Mark A. Engle, Isabelle M. Cozzarelli, Bruce D. Smith