Publications
Filter Total Items: 990
Structural geology of Amazonian-aged layered sedimentary deposits in southwest Candor Chasma, Mars Structural geology of Amazonian-aged layered sedimentary deposits in southwest Candor Chasma, Mars
The structural geology of an outcropping of layered sedimentary deposits in southwest Candor Chasma is mapped using two adjacent high-resolution (1 m/pixel) HiRISE digital elevation models and orthoimagery. Analysis of these structural data yields new insight into the depositional and deformational history of these deposits. Bedding in non-deformed areas generally dips toward the center...
Authors
Chris Okubo
Coregistration of Mars Orbiter Laser Altimeter (MOLA) topography with high-resolution Mars images Coregistration of Mars Orbiter Laser Altimeter (MOLA) topography with high-resolution Mars images
Spacecraft continue to send back extraordinary amounts of data from Mars leaving scientists with the considerable task of analyzing an ever-increasing wealth of information. There are abundant uses for coregistered topography and images, but coregistering various datasets can be time-consuming and labor-intensive. We have developed a set of C-shell Unix scripts and Interactive Data...
Authors
Kelly J. Kolb, Chris H. Okubo
Preservation of random megascale events on Mars and Earth: Influence on geologic history: GSA special papers Preservation of random megascale events on Mars and Earth: Influence on geologic history: GSA special papers
No abstract available.
Authors
Mary G. Chapman, Laszlo P. Keszthelyi
Introduction to the High Resolution Imaging Science Experiment (HiRISE) Introduction to the High Resolution Imaging Science Experiment (HiRISE)
No abstract available.
Authors
Alfred S. McEwen, Kenneth E. Herkenhoff, Laszlo P. Keszthelyi
The Lunar Reconnaissance Orbiter Diviner Lunar Radiometer Experiment The Lunar Reconnaissance Orbiter Diviner Lunar Radiometer Experiment
The Diviner Lunar Radiometer Experiment on NASA’s Lunar Reconnaissance Orbiter will be the first instrument to systematically map the global thermal state of the Moon and its diurnal and seasonal variability. Diviner will measure reflected solar and emitted infrared radiation in nine spectral channels with wavelengths ranging from 0.3 to 400 microns. The resulting measurements will...
Authors
D. A. Paige, M. C. Foote, B. T. Greenhagen, J. T. Schofield, S. Calcutt, A. R. Vasavada, D. J. Preston, F. W. Taylor, C. C. Allen, K. Snook, B. M. Jakosky, B. C. Murray, Laurence A. Soderblom, B. Jau, S. Loring, J. Bulharowski, N. E. Bowles, I. R. Thomas, M. T. Sullivan, C. Avis, E. M. De Jong, W. Hartford, D. J. McCleese
Titan's surface at 2.2-cm wavelength imaged by the Cassini RADAR radiometer: Calibration and first results Titan's surface at 2.2-cm wavelength imaged by the Cassini RADAR radiometer: Calibration and first results
The first comprehensive calibration and mapping of the thermal microwave emission from Titan's surface is reported based on radiometric data obtained at 2.2-cm wavelength by the passive radiometer included in the Cassini Radar instrument. The data reported were accumulated from 69 separate observational segments in Titan passes from Ta (October 2004) through T30 (May 2007) and include...
Authors
M.A. Janssen, R. D. Lorenz, R. West, F. Paganelli, R.M. Lopes, Randolph L. Kirk, C. Elachi, S. D. Wall, W.T.K. Johnson, Y. Anderson, R.A. Boehmer, P. Callahan, Y. Gim, G.A. Hamilton, K.D. Kelleher, L. Roth, B. Stiles, A. Le Gall
Floods of water and lava in the Columbia River Basin: Analogs for Mars Floods of water and lava in the Columbia River Basin: Analogs for Mars
The Columbia River Basin (CRB) is home to the best studied examples of two of the most spectacular geologic processes on Earth and Mars: flood volcanism and catastrophic water floods. Additionally, features formed by a variety of eolian, glacial, tectonic, and mass-wasting processes can also be seen in the CRB. These terrains provide exceptional terrestrial analogs for the study of...
Authors
Laszlo P. Keszthelyi, Victor R. Baker, Windy L. Jaeger, David R. Gaylord, Bruce Bjornstad, Noam Greenbaum, Stephen Self, Thorvaldur Thordarson, Naomi Porat, Marek G. Zreda
Extraterrestrial GIS Extraterrestrial GIS
No abstract available.
Authors
Trent M. Hare, Randolph L. Kirk, James A. Skinner, Kenneth L. Tanaka
Photometric changes on Saturn's Titan: Evidence for active cryovolcanism Photometric changes on Saturn's Titan: Evidence for active cryovolcanism
We report infrared spectrophotometric variability on the surface of Saturn's moon Titan detected in images returned by the Visual and Infrared Mapping Spectrometer (VIMS) onboard the Cassini Saturn Orbiter. The changes were observed at 7°S, 138°W and occurred between October 27, 2005 and January 15, 2006. After that date the surface was unchanged until the most recent observation, March...
Authors
Robert M. Nelson, Lucas W. Kamp, Rosaly Lopes, Dennis L. Matson, Randolph L. Kirk, Bruce W. Hapke, Stephen D. Wall, Mark D. Boryta, Frank E. Leader, William D. Smythe, Karl L. Mitchell, Kevin H. Baines, Ralf Jaumann, Christophe Sotin, Roger N. Clark, Dale P. Cruikshank, Pierre Drossart, Jonathan I. Lunine, Michel Combes, Giancarlo Bellucci, Jean-Pierre Bibring, Fabrizio Capaccioni, Pricilla Cerroni, Angioletta Coradini, Vittorio Formisano, Gianrico Filacchione, Yves Langevin, Thomas B. McCord, Vito Mennella, Philip D. Nicholson, Bruno Sicardy, Patrick G.J. Irwin, John C. Pearl
Dielectric properties of lava flows west of Ascraeus Mons, Mars Dielectric properties of lava flows west of Ascraeus Mons, Mars
The SHARAD instrument on the Mars Reconnaissance Orbiter detects subsurface interfaces beneath lava flow fields northwest of Ascraeus Mons. The interfaces occur in two locations; a northern flow that originates south of Alba Patera, and a southern flow that originates at the rift zone between Ascraeus and Pavonis Montes. The northern flow has permittivity values, estimated from the time...
Authors
Lynn M. Carter, Bruce A. Campbell, John W. Holt, Roger J. Phillips, Nathaniel E. Putzig, Stefania Mattei, Roberto Seu, Chris H. Okubo, Anthony F. Egan
A prelanding assessment of the ice table depth and ground ice characteristics in Martian permafrost at the Phoenix landing site A prelanding assessment of the ice table depth and ground ice characteristics in Martian permafrost at the Phoenix landing site
We review multiple estimates of the ice table depth at potential Phoenix landing sites and consider the possible state and distribution of subsurface ice. A two-layer model of ice-rich material overlain by ice-free material is consistent with both the observational and theoretical lines of evidence. Results indicate ground ice to be shallow and ubiquitous, 2-6 cm below the surface...
Authors
Michael T. Mellon, William V. Boynton, William C. Feldman, Raymond E. Arvidson, Timothy N. Titus, Joshua L. Bandfield, Nathaniel E. Putzig, H. G. Sizemore
Thorium abundances on the Aristarchus plateau: Insights into the composition of the Aristarchus pyroclastic glass deposits Thorium abundances on the Aristarchus plateau: Insights into the composition of the Aristarchus pyroclastic glass deposits
Thorium (Th) data from the Lunar Prospector gamma ray spectrometer (LP‐GRS) are used to constrain the composition of lunar pyroclastic glass deposits on top of the Aristarchus plateau. Our goal is to use forward modeling of LP‐GRS Th data to measure the Th abundances on the plateau and then to determine if the elevated Th abundances on the plateau are associated with the pyroclastic...
Authors
Justin Hagerty, D. J. Lawrence, B. R. Hawke, Lisa R. Gaddis