Publications
Filter Total Items: 7494
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
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
Monthly Strontium/Calcium oscillations in symbiotic coral aragonite: Biological effects limiting the precision of the paleotemperature proxy Monthly Strontium/Calcium oscillations in symbiotic coral aragonite: Biological effects limiting the precision of the paleotemperature proxy
In thermodynamic equilibrium with sea water the Sr/Ca ratio of aragonite varies predictably with temperature and the Sr/Ca ratio in coral have thus become a frequently used proxy for past Sea Surface Temperature (SST). However, biological effects can offset the Sr/Ca ratio from its equilibrium value. We report high spatial resolution ion microprobe analyses of well defined skeletal...
Authors
A. Meibom, M. Stage, Joseph L. Wooden, B.R. Constantz, R. B. Dunbar, A. Owen, N. Grumet, C. R. Bacon, C. P. Chamberlain
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
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
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
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
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
Debris-flow hazards caused by hydrologic events at Mount Rainier, Washington Debris-flow hazards caused by hydrologic events at Mount Rainier, Washington
At 4393 m, ice-clad Mount Rainier has great potential for debris flows owing to its precipitous slopes and incised steep valleys, the large volume of water stored in its glaciers, and a mantle of loose debris on its slopes. In the past 10,000 years, more than sixty Holocene lahars have occurred at Mount Rainier (Scott et al., 1985), and, in addition more than thirty debris flows not...
Authors
James W. Vallance, Michelle L. Cunico, Steve P. Schilling
Preliminary evaluation of a precipitation threshold for anticipating the occurrence of landslides in the Seattle, Washington, area Preliminary evaluation of a precipitation threshold for anticipating the occurrence of landslides in the Seattle, Washington, area
No abstract available.
Authors
Alan F. Chleborad
Earthquake recordings from the 2002 Seattle Seismic Hazard Investigation of Puget Sound (SHIPS), Washington state Earthquake recordings from the 2002 Seattle Seismic Hazard Investigation of Puget Sound (SHIPS), Washington state
This report describes seismic data obtained during the fourth Seismic Hazard Investigation of Puget Sound (SHIPS) experiment, termed Seattle SHIPS . The experiment was designed to study the influence of the Seattle sedimentary basin on ground shaking during earthquakes. To accomplish this, we deployed seismometers over the basin to record local earthquakes, quarry blasts, and teleseisms...
Authors
Thomas L. Pratt, Karen L. Meagher, Thomas M. Brocher, Thomas Yelin, Robert Norris, Lynn Hultgrien, Elizabeth Barnett, Craig S. Weaver