Publications
Filter Total Items: 7512
Exposed water ice discovered near the south pole of Mars Exposed water ice discovered near the south pole of Mars
The Mars Odyssey Thermal Emission Imaging System (THEMIS) has discovered water ice exposed near the edge of Mars' southern perennial polar cap. The surface H2O ice was first observed by THEMIS as a region that was cooler than expected for dry soil at that latitude during the summer season. Diurnal and seasonal temperature trends derived from Mars Global Surveyor Thermal Emission...
Authors
Timothy N. Titus, Hugh H. Kieffer, Phillip R. Christensen
Resurfacing history of the northern plains of Mars based on geologic mapping of Mars Global Surveyor data Resurfacing history of the northern plains of Mars based on geologic mapping of Mars Global Surveyor data
Geologic mapping of the northern plains of Mars, based on Mars Orbiter Laser Altimeter topography and Viking and Mars Orbiter Camera images, reveals new insights into geologic processes and events in this region during the Hesperian and Amazonian Periods. We propose four successive stages of lowland resurfacing likely related to the activity of near-surface volatiles commencing at the...
Authors
Kenneth L. Tanaka, James A. Skinner, Trent M. Hare, T. Joyal, A. Wenker
Beach systems: sediment yield from Big Sur coastal landslides Beach systems: sediment yield from Big Sur coastal landslides
No abstract available.
Authors
Cheryl Hapke
Athena Microscopic Imager investigation Athena Microscopic Imager investigation
The Athena science payload on the Mars Exploration Rovers (MER) includes the Microscopic Imager (MI). The MI is a fixed‐focus camera mounted on the end of an extendable instrument arm, the Instrument Deployment Device (IDD). The MI was designed to acquire images at a spatial resolution of 30 microns/pixel over a broad spectral range (400–700 nm). The MI uses the same electronics design...
Authors
Kenneth E. Herkenhoff, S. W. Squyres, J.F. Bell, J.N. Maki, H.M. Arneson, P. Bertelsen, D.I. Brown, S.A. Collins, A. Dingizian, S.T. Elliott, W. Goetz, E.C. Hagerott, A. G. Hayes, M. J. Johnson, Randolph L. Kirk, S. McLennan, R.V. Morris, L.M. Scherr, M.A. Schwochert, L.R. Shiraishi, G.H. Smith, Laurence A. Soderblom, J. N. Sohl-Dickstein, M.V. Wadsworth
Meter-scale slopes of candidate MER landing sites from point photoclinometry Meter-scale slopes of candidate MER landing sites from point photoclinometry
Photoclinometry was used to analyze the small-scale roughness of areas that fall within the proposed Mars Exploration Rover (MER) 2003 landing ellipses. The landing ellipses presented in this study were those in Athabasca Valles, Elysium Planitia, Eos Chasma, Gusev Crater, Isidis Planitia, Melas Chasma, and Meridiani Planum. We were able to constrain surface slopes on length scales...
Authors
Ross A. Beyer, Alfred S. McEwen, Randolph L. Kirk
Landslides and liquefaction triggered by the M 7.9 denali fault earthquake of 3 November 2002 Landslides and liquefaction triggered by the M 7.9 denali fault earthquake of 3 November 2002
The moment magnitude (M) 7.9 Denali Fault earthquake in Alaska of 3 November 2002 triggered an unusual pattern of landslides and liquefaction effects. The landslides were primarily rock falls and rock slides that ranged in volume from a few cubic meters to the 40 million-cubic-meter rock avalanche that covered much of the McGinnis Glacier. Landslides were concentrated in a narrow zone...
Authors
E. L. Harp, R.W. Jibson, R. E. Kayen, D. K. Keefer, B.L. Sherrod, G. A. Carver, B.D. Collins, R.E.S. Moss, N. Sitar
Enlisting the support of land-use planners to reduce debris-flow hazards in the United States Enlisting the support of land-use planners to reduce debris-flow hazards in the United States
Land-use planners have an important role in reducing losses from debris-flow hazards. For that reason, the U.S. Geological Survey (USGS) and the American Planning Association (APA) have developed a strategy to make information about landslide and debris-flow hazards available to local planners so that they can incorporate this information into the planning process. A guidebook for...
Authors
P. L. Gori, S.P. Jeer, L.M. Highland
Mars Exploration Rover Athena Panoramic Camera (Pancam) investigation Mars Exploration Rover Athena Panoramic Camera (Pancam) investigation
The Panoramic Camera (Pancam) investigation is part of the Athena science payload launched to Mars in 2003 on NASA's twin Mars Exploration Rover (MER) missions. The scientific goals of the Pancam investigation are to assess the high‐resolution morphology, topography, and geologic context of each MER landing site, to obtain color images to constrain the mineralogic, photometric, and...
Authors
J.F. Bell, S. W. Squyres, Kenneth E. Herkenhoff, J.N. Maki, H.M. Arneson, D. Brown, S.A. Collins, A. Dingizian, S.T. Elliot, E.C. Hagerott, A. G. Hayes, M. J. Johnson, J. R. Johnson, J. Joseph, K. Kinch, M.T. Lemmon, R.V. Morris, L. Scherr, M. Schwochert, M.K. Shepard, G.H. Smith, J. N. Sohl-Dickstein, R.J. Sullivan, W.T. Sullivan, M. Wadsworth
Slip history and dynamic implications of the 1999 Chi-Chi, Taiwan, earthquake Slip history and dynamic implications of the 1999 Chi-Chi, Taiwan, earthquake
[1] We investigate the rupture process of the 1999 Chi‐Chi, Taiwan, earthquake using extensive near‐source observations, including three‐component velocity waveforms at 36 strong motion stations and 119 GPS measurements. A three‐plane fault geometry derived from our previous inversion using only static data [Ji et al., 2001] is applied. The slip amplitude, rake angle, rupture initiation...
Authors
Ji Chen, Donald V. Helmberger, David J. Wald, Kuo-Fong Ma
Site response, shallow shear-wave velocity, and wave propagation at the San Jose, California, dense seismic array Site response, shallow shear-wave velocity, and wave propagation at the San Jose, California, dense seismic array
Ground-motion records from a 52-element dense seismic array near San Jose, California, are analyzed to obtain site response, shallow shear-wave velocity, and plane-wave propagation characteristics. The array, located on the eastern side of the Santa Clara Valley south of the San Francisco Bay, is sited over the Evergreen basin, a 7-km-deep depression with Miocene and younger deposits...
Authors
S. Hartzell, D. Carver, R. A. Williams, S. Harmsen, A. Zerva
Responses of infaunal populations to benthoscape structure and the potential importance of transition zones Responses of infaunal populations to benthoscape structure and the potential importance of transition zones
Relationships between population abundance and seafloor landscape, or benthoscape, structure were examined for 16 infaunal taxa in eastern Long Island Sound. Based on analyses of a side-scan sonar mosaic, the 19.4-km2 study area was comprised of six distinct large-scale (> km2) benthoscape elements, with varying levels of mesoscale (km2-m2) and small-scale ( m2) physical and biological...
Authors
R.N. Zajac, R. S. Lewis, L.J. Poppe, D.C. Twichell, J. Vozarik, M. L. DiGiacomo-Cohen
Preliminary geologic map of Kanaga Volcano, Alaska Preliminary geologic map of Kanaga Volcano, Alaska
Kanaga Volcano is a 1,300 m (4,287-foot) high, historically active cone-shaped stratovolcano located on the north end of Kanaga Island in the Andreanof Islands Group of the Aleutian Islands. The volcano is undissected, symmetrical in profile, and is characterized by blocky andesitic lava flows, with well-developed levees and steep flow fronts, that emanate radially from, or near, the 200...
Authors
T. P. Miller, C. F. Waythomas, C.J. Nye