Karl J Ellefsen
Karl Ellefsen is an Emeritus with the Geology, Geophysics, and Geochemistry Science Center.
Science and Products
Filter Total Items: 65
xwell_radar; a program for calculating crosswell radar traces for layered media xwell_radar; a program for calculating crosswell radar traces for layered media
No abstract available.
Authors
Karl Ellefsen
pick_xwell, a program for interactive picking of crosswell seismic and radar data pick_xwell, a program for interactive picking of crosswell seismic and radar data
Program 'pick_xwell' is used to interactively pick travel times in crosswell seismic and radar data. In addition, the traces and the travel times can be plotted on the computer screen or printed to a file in postscript format. The program is written in the IDL programming language, and it is executed, in command-line mode, within the IDL program. The IDL program must be run from an X...
Authors
K.J. Ellefsen
Effects of layered sediments on the guided wave in crosswell radar data Effects of layered sediments on the guided wave in crosswell radar data
To understand how layered sediments affect the guided wave in crosswell radar data, traces are calculated for a model representing a sand layer between two clay layers. A guided wave propagates if the wavelengths in the sand layer are similar to the thickness of the sand layer. The amplitude of the guided wave but not its initial traveltime is affected by the thickness of the sand layer...
Authors
K.J. Ellefsen
Processing of seismic tomography data collected at Tunnel 160, Deglen Mountain, Kazakhstan Processing of seismic tomography data collected at Tunnel 160, Deglen Mountain, Kazakhstan
No abstract available.
Authors
Karl Ellefsen, William Leith
An analysis of crosswell radar data collected during an experimental gasoline spill An analysis of crosswell radar data collected during an experimental gasoline spill
No abstract available.
Authors
K.J. Ellefsen
An evaluation of several geophysical methods for characterizing sand and gravel deposits An evaluation of several geophysical methods for characterizing sand and gravel deposits
No abstract available.
Authors
K.J. Ellefsen, J.E. Lucius, D.V. Fitterman
Summary of geophysical investigations for DNAPL remediation at Savannah River Site, South Carolina Summary of geophysical investigations for DNAPL remediation at Savannah River Site, South Carolina
No abstract available.
Authors
K.J. Ellefsen, P. Nelson, R. Horton, D.L. Wright
Radar tomograms at Mirror Lake, New Hampshire--3D visualization and a brine tracer experiment Radar tomograms at Mirror Lake, New Hampshire--3D visualization and a brine tracer experiment
No abstract available.
Authors
David Wright, T.P. Grover, Karl Ellefsen, John W. Lane, P. Kase
Cross-well radar in layered sediments Cross-well radar in layered sediments
No abstract available.
Authors
K.J. Ellefsen
High resolution mapping of stratigraphy using seismic tomography; a feasibility test at the M-area basin, Savannah River Site, South Carolina High resolution mapping of stratigraphy using seismic tomography; a feasibility test at the M-area basin, Savannah River Site, South Carolina
No abstract available.
Authors
Karl Ellefsen
Science and Products
Filter Total Items: 65
xwell_radar; a program for calculating crosswell radar traces for layered media xwell_radar; a program for calculating crosswell radar traces for layered media
No abstract available.
Authors
Karl Ellefsen
pick_xwell, a program for interactive picking of crosswell seismic and radar data pick_xwell, a program for interactive picking of crosswell seismic and radar data
Program 'pick_xwell' is used to interactively pick travel times in crosswell seismic and radar data. In addition, the traces and the travel times can be plotted on the computer screen or printed to a file in postscript format. The program is written in the IDL programming language, and it is executed, in command-line mode, within the IDL program. The IDL program must be run from an X...
Authors
K.J. Ellefsen
Effects of layered sediments on the guided wave in crosswell radar data Effects of layered sediments on the guided wave in crosswell radar data
To understand how layered sediments affect the guided wave in crosswell radar data, traces are calculated for a model representing a sand layer between two clay layers. A guided wave propagates if the wavelengths in the sand layer are similar to the thickness of the sand layer. The amplitude of the guided wave but not its initial traveltime is affected by the thickness of the sand layer...
Authors
K.J. Ellefsen
Processing of seismic tomography data collected at Tunnel 160, Deglen Mountain, Kazakhstan Processing of seismic tomography data collected at Tunnel 160, Deglen Mountain, Kazakhstan
No abstract available.
Authors
Karl Ellefsen, William Leith
An analysis of crosswell radar data collected during an experimental gasoline spill An analysis of crosswell radar data collected during an experimental gasoline spill
No abstract available.
Authors
K.J. Ellefsen
An evaluation of several geophysical methods for characterizing sand and gravel deposits An evaluation of several geophysical methods for characterizing sand and gravel deposits
No abstract available.
Authors
K.J. Ellefsen, J.E. Lucius, D.V. Fitterman
Summary of geophysical investigations for DNAPL remediation at Savannah River Site, South Carolina Summary of geophysical investigations for DNAPL remediation at Savannah River Site, South Carolina
No abstract available.
Authors
K.J. Ellefsen, P. Nelson, R. Horton, D.L. Wright
Radar tomograms at Mirror Lake, New Hampshire--3D visualization and a brine tracer experiment Radar tomograms at Mirror Lake, New Hampshire--3D visualization and a brine tracer experiment
No abstract available.
Authors
David Wright, T.P. Grover, Karl Ellefsen, John W. Lane, P. Kase
Cross-well radar in layered sediments Cross-well radar in layered sediments
No abstract available.
Authors
K.J. Ellefsen
High resolution mapping of stratigraphy using seismic tomography; a feasibility test at the M-area basin, Savannah River Site, South Carolina High resolution mapping of stratigraphy using seismic tomography; a feasibility test at the M-area basin, Savannah River Site, South Carolina
No abstract available.
Authors
Karl Ellefsen