Publications
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TES premapping data: Slab ice and snow flurries in the Martian north polar night
In the 1970s, Mariner and Viking spacecraft observations of the north polar region of Mars revealed polar brightness temperatures that were significantly below the expected kinetic temperatures for CO2 sublimation. For the past few decades, the scientific community has speculated as to the nature of these Martian polar cold spots. Thermal Emission Spectrometer (TES) thermal spectral data have show
Authors
Timothy N. Titus, Hugh H. Kieffer, Kevin F. Mullins, Phillip R. Christensen
Debris-flow generation from recently burned watersheds
Evaluation of the erosional response of 95 recently burned drainage basins in Colorado, New Mexico and southern California to storm rainfall provides information on the conditions that result in fire-related debris flows. Debris flows were produced from only 37 of 95 (~40 percent) basins examined; the remaining basins produced either sediment-laden streamflow or no discernable response. Debris flo
Authors
S.H. Cannon
TES mapping of Mars' north seasonal cap
The Mars Global Surveyor thermal emission spectrometer has made observations of Mars' north polar region for nearly a full martian year. Measurements of bolometric emission and reflectance, as well as brightness temperatures in specific bands synthesized from thermal radiance spectra, are used to track the behavior of surface and atmospheric temperatures, the distribution of condensed CO2 and H2O,
Authors
Hugh H. Kieffer, Timothy N. Titus
Preliminary geological assessment of the Northern edge of Ultimi Lobe, Mars South Polar layered deposits
We have examined the local base of the south polar layered deposits (SPLD) exposed in the bounding scarp near 72°–74°S, 215°–230°W where there is a clear unconformable contact with older units. Sections of layering up to a kilometer thick were examined along the bounding scarp, permitting an estimate of the thinnest individual layers yet reported in the SPLD. Rhythmic layering is also present loca
Authors
B. Murray, M. Koutnik, S. Byrne, Laurence A. Soderblom, Kenneth E. Herkenhoff, K. L. Tanaka
Seismic hazard in Hawaii: High rate of large earthquakes and probabilistics ground-motion maps
The seismic hazard and earthquake occurrence rates in Hawaii are locally as high as that near the most hazardous faults elsewhere in the United States. We have generated maps of peak ground acceleration (PGA) and spectral acceleration (SA) (at 0.2, 0.3 and 1.0 sec, 5% critical damping) at 2% and 10% exceedance probabilities in 50 years. The highest hazard is on the south side of Hawaii Island, as
Authors
F. W. Klein, A. D. Frankel, C.S. Mueller, R. L. Wesson, P. G. Okubo
Volcano collapse promoted by hydrothermal alteration and edifice shape, Mount Rainier, Washington
Catastrophic collapses of steep volcano flanks threaten many populated regions, and understanding factors that promote collapse could save lives and property. Large collapses of hydrothermally altered parts of Mount Rainier have generated far-traveled debris flows; future flows would threaten densely populated parts of the Puget Sound region. We evaluate edifice collapse hazards at Mount Rainier u
Authors
M.E. Reid, T. W. Sisson, D.L. Brien
Wildfire-related debris-flow initiation processes, Storm King Mountain, Colorado
A torrential rainstorm on September 1, 1994 at the recently burned hillslopes of Storm King Mountain, CO, resulted in the generation of debris flows from every burned drainage basin. Maps (1:5000 scale) of bedrock and surficial materials and of the debris-flow paths, coupled with a 10-m Digital Elevation Model (DEM) of topography, are used to evaluate the processes that generated fire-related debr
Authors
S.H. Cannon, R. M. Kirkham, M. Parise
Antarctic ice streams and outflow channels on Mars
New sonar images of the Antarctic sea floor reveal mega-scale glacial lineations that are strikingly similar to longitudinal flutes in martian outflow channels. The analogs suggest that ice moved through the martian channels in places and carved the flutes. The ice in martian channels may have moved like Antarctic ice streams on deformable debris saturated with water under high pore pressure. On M
Authors
Baerbel K. Lucchitta
Quantifying the relative importance of flow regulation and grain size regulation of suspended sediment transport α and tracking changes in grain size of bed sediment β
To predict changes in sediment transport, it is essential to know whether transport is regulated mainly by changes in flow or by changes in grain size of sediment on the bed. In flows where changes in suspended sediment transport are regulated purely by changes in flow (grain size of bed sediment is constant), increases in flow strength cause increases in both concentration and grain size of sedim
Authors
David M. Rubin, David J. Topping
The roughness of natural terrain: A planetary and remote sensing perspective
We examine the various methods and parameters in common use for quantifying and reporting surface topographic "roughness." It is shown that scale-dependent roughness parameters are almost always required, though not widely used. We suggest a method of standardizing the parameters that are computed and reported so that topographic data gathered by different workers using different field techniques
Authors
Michael K. Shepard, Bruce A. Campbell, Mark H. Bulmer, Lisa R. Gaddis, Tom G. Farr, Jeffrey J. Plaut
Tectonic controls on large landslide complex: Williams Fork Mountains near Dillon, Colorado
An extensive (~ 25 km2) landslide complex covers a large area on the west side of the Williams Fork Mountains in central Colorado. The complex is deeply weathered and incised, and in most places geomorphic evidence of sliding (breakaways, hummocky topography, transverse ridges, and lobate distal zones) are no longer visible, indicating that the main mass of the slide has long been inactive. Howeve
Authors
K. S. Kellogg
Respuesta a los desprendimientos de tierra ocasionados por las lluvias torrenciales del Huracan Mitch en siete areas de estudio de Nicaragua [Landslide response to Hurricane Mitch rainfall in seven study areas in Nicaragua]
No abstract available.
Authors
Susan H. Cannon, Kathleen M. Haller, Ingrid Ekstrom, Eugene S. Schweig, Graziella Devoli, David W. Moore, Sharon A. Rafferty, Arthur C. Tarr