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Filter Total Items: 2,153
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Year Published: 2017

Martian cave air-movement via Helmholtz resonance

Infrasonic resonance has previously been measured in terrestrial caves by other researchers, where Helmholtz resonance has been suggested as the plausible mechanism resulting in periodic wind reversals within cave entrances. We extend this reasoning to possible Martian caves, where we examine the characteristics of four atypical pit craters (APCs...

Williams, Kaj; Titus, Timothy N.; Okubo, Chris; Cushing, Glen E.
Williams, Kaj E.; Timothy N. Titus; Chris H. Okubo; and Glen E. Cushing. 2017. Martian cave air-movement via Helmholtz resonance. International Journal of Speleology, 46: 439-444.

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Year Published: 2017

Taxonomic and compositional differences of ground-dwelling arthropods in riparian habitats in Glen Canyon, Arizona, USA

The disturbance history, plant species composition, productivity, and structural complexity of a site can exert bottom-up controls on arthropod diversity, abundance, and trophic structure. Regulation alters the hydrology and disturbance regimes of rivers and affects riparian habitats by changing plant quality parameters. Fifty years of regulation...

Ralston, Barbara; Cobb, Neil S.; Brantley, Sandra L.; Higgins, Jacob; Yackulic, Charles B.
Ralston, B.E., Cobb, N.S., Brantley, S.L., Higgins, J., and Yackulic, C.B., 2017, Taxonomic and compositional differences of ground-dwelling arthropods in riparian habitats in Glen Canyon, Arizona, USA: Western North American Naturalist, v. 77, no. 3, p.369-384, http://scholarsarchive.byu.edu/wnan/vol77/iss3/8.

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Year Published: 2017

The interior structure of Ceres as revealed by surface topography

Ceres, the largest body in the asteroid belt (940 km diameter), provides a unique opportunity to study the interior structure of a volatile-rich dwarf planet. Variations in a planetary body's subsurface rheology and density affect the rate of topographic relaxation. Preferential attenuation of long wavelength topography (≥150 km) on Ceres suggests...

Fu, Roger R.; Ermakov, Anton; Marchi, Simone; Castillo-Rogez, Julie C.; Raymond, Carol A.; Hager, Bradford; Zuber, Maria; King, Scott D.; Bland, Michael T.; De Sanctis, Maria Cristina; Preusker, Frank; Park, Ryan S.; Russell, Christopher T.

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Year Published: 2017

Concentration and trend of 1,4-dioxane in wells sampled during 2002–2017 in the vicinity of the Tucson International Airport Area Superfund Site, Arizona

Industrial activities causing extensive groundwater contamination led to the listing of the Tucson International Airport Area (TIAA) as a Superfund Site in 1983. Early groundwater investigations identified volatile organic compounds (VOCs), including the chlorinated solvents trichloroethylene (TCE) and perchloroethylene (PCE), in wells in the area...

Tillman, Fred D.
Tillman, Fred, 2017, Concentration and trend of 1,4-dioxane in wells sampled during 2002–2017 in the vicinity of the Tucson International Airport Area Superfund Site: U.S. Geological Survey Scientific Investigations Map 3385, scale 1:7,500, 1 sheet, https://doi.org/10.3133/sim3385.

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Year Published: 2017

Pitted terrains on (1) Ceres and implications for shallow subsurface volatile distribution

Prior to the arrival of the Dawn spacecraft at Ceres, the dwarf planet was anticipated to be ice-rich. Searches for morphological features related to ice have been ongoing during Dawn's mission at Ceres. Here we report the identification of pitted terrains associated with fresh Cerean impact craters. The Cerean pitted terrains exhibit strong...

Sizemore, H.G.; Platz, Thomas; Schorghofer, Norbert; Prettyman, Thomas; De Sanctis, Maria Christina; Crown, David A.; Schmedemann, Nico; Nessemann, Andeas; Kneissl, Thomas; Simone Marchi; Schenk, Paul M.; Bland, Michael T.; Schmidt, B.E.; Hughson, Kynan H.G.; Tosi, F.; Zambon, F; Mest, S.C.; Yingst, R.A.; Williams, D.A.; Russell, C.T.; Raymond, C.A.
Sizemore, H. G., et al. (2017), Pitted terrains on (1) Ceres and implications for shallow subsurface volatile distribution, Geophys. Res. Lett., 44, 6570-6578, doi:10.1002/2017GL073970

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Year Published: 2017

Selection of the InSight landing site

The selection of the Discovery Program InSight landing site took over four years from initial identification of possible areas that met engineering constraints, to downselection via targeted data from orbiters (especially Mars Reconnaissance Orbiter (MRO) Context Camera (CTX) and High-Resolution Imaging Science Experiment (HiRISE) images), to...

Golombek, M.; Kipp, D.; Warner, N.; Daubar, Ingrid J.; Fergason, Robin L.; Kirk, Randolph L.; Beyer, R.; Huertas, A.; Piqueux, Sylvain; Putzig, N.E.; Campbell, B.A.; Morgan, G. A.; Charalambous, C.; Pike, W. T.; Gwinner, K.; Calef, F.; Kass, D.; Mischna, M. A.; Ashley, J.; Bloom, C.; Wigton, N.; Hare, T.; Schwartz, C.; Gengl, H.; Redmond, L.; Trautman, M.; Sweeney, J.; Grima, C.; Smith, I. B.; Sklyanskiy, E.; Lisano, M.; Benardini, J.; Smrekar, S.E.; Lognonne, P.; Banerdt, W. B.

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Year Published: 2017

Importance of measuring discharge and sediment transport in lesser tributaries when closing sediment budgets

Sediment budgets are an important tool for understanding how riverine ecosystems respond to perturbations. Changes in the quantity and grain size distribution of sediment within river systems affect the channel morphology and related habitat resources. It is therefore important for resource managers to know if a river reach is in a state of...

Griffiths, Ronald; Topping, David
Griffiths, R.E., and Topping, D.J., 2017, Importance of measuring discharge and sediment transport in lesser tributaries when closing sediment budgets: Geomorphology, v. 296, p. 59-73, https://doi.org/10.1016/j.geomorph.2017.08.037.

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Year Published: 2017

Mammalian mesocarnivore visitation at tortoise burrows in a wind farm

There is little information on predator–prey interactions in wind energy landscapes in North America, especially among terrestrial vertebrates. Here, we evaluated how proximity to roads and wind turbines affect mesocarnivore visitation with desert tortoises (Gopherus agassizii) and their burrows in a wind energy landscape. In 2013, we placed...

Agha, Mickey; Smith, Amanda L.; Lovich, Jeffrey E.; Delaney, David F.; Ennen, Joshua R.; Briggs, Jessica R.; Fleckenstein, Leo J.; Tennant, Laura A.; Puffer, Shellie R.; Walde, Andrew D.; Arundel, Terence R.; Price, Steven J.; Todd, Brian D.
Agha, M., Smith, A.L., Lovich, J.E., Delaney, D., Ennen, J.R., Briggs, J., Fleckenstein, L.J., Tennant, L.A., Puffer, S.R., Walde, A., Arundel, T., Price, S.J., and Todd, B.D., 2017, Mammalian mesocarnivore visitation at tortoise burrows in a wind farm: Journal of Wildlife Management, v. (online), http://dx.doi.org/10.1002/jwmg.21262.

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Year Published: 2017

Climate, wildfire, and erosion ensemble foretells more sediment in western USA watersheds

The area burned annually by wildfires is expected to increase worldwide due to climate change. Burned areas increase soil erosion rates within watersheds, which can increase sedimentation in downstream rivers and reservoirs. However, which watersheds will be impacted by future wildfires is largely unknown. Using an ensemble of climate, fire, and...

Sankey, Joel B.; Kreitler, Jason R.; Hawbaker, Todd; McVay, Jason L.; Miller, Mary Ellen; Mueller, Erich R.; Vaillant, Nicole M.; Lowe, Scott E.; Sankey, Temuulen T.
Sankey, J.B., Kreitler, J., Hawbaker, T.J., McVay, J.L., Miller, M.E., Mueller, E.R., Vaillant, N.M., Lowe, S.E., and Sankey, T.T., 2017, Climate, wildfire, and erosion ensemble foretells more sediment in western USA watersheds: Geophysical Research Letters, v. (online), http://dx.doi.org/10.1002/2017GL073979.

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Year Published: 2017

The Mars Science Laboratory Curiosity rover Mastcam instruments: Preflight and in-flight calibration, validation, and data archiving

The NASA Curiosity rover Mast Camera (Mastcam) system is a pair of fixed-focal length, multispectral, color CCD imagers mounted ~2 m above the surface on the rover's remote sensing mast, along with associated electronics and an onboard calibration target. The left Mastcam (M-34) has a 34 mm focal length, an instantaneous field of view (...

Bell, James F. ; Godber, A.; McNair, S.; Caplinger, M.A.; Maki, J.N.; Lemmon, M.T.; Van Beek, J.; Malin, M.C.; Wellington, D.; Kinch, K.M.; Madsen, M.B.; Hardgrove, C.; Ravine, M.A.; Jensen, E.; Harker, D.; Anderson, Ryan; Herkenhoff, Kenneth E.; Morris, R.V.; Cisneros, E.; Deen, R.G.

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Year Published: 2017

Viscous relaxation of Ganymede's impact craters: Constraints on heat flux

Measurement of crater depths in Ganymede’s dark terrain have revealed substantial numbers of unusually shallow craters indicative of viscous relaxation [see companion paper: Singer, K.N., Schenk, P. M., Bland, M.T., McKinnon, W.B., (2017). Relaxed impact craters on Ganymede: Regional variations and high heat flow. Icarus, submitted]. These...

Bland, Michael T.; Singer, Kelsi N.; McKinnon, William B.; Schenk, Paul M.
Bland, M. T. and McKinnon, W. B. Viscous relaxation of Ganymede's impact craters: Constraints on heat flux. Icarus 296, 275-288.

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Year Published: 2017

In situ detection of boron by ChemCam on Mars

We report the first in situ detection of boron on Mars. Boron has been detected in Gale crater at levels <0.05 wt % B by the NASA Curiosity rover ChemCam instrument in calcium‐sulfate‐filled fractures, which formed in a late‐stage groundwater circulating mainly in phyllosilicate‐rich bedrock interpreted as lacustrine in origin. We...

Gasda, Patrick J.; Haldeman, Ethan B.; Wiens, Roger C.; Rapin, William; Bristow, Thomas F.; Bridges, John C.; Schwenzer, Susanne P.; Clark, Benton C.; Herkenhoff, Kenneth E.; Frydenvang, Jens; Lanza, Nina L.; Maurice, Sylvestre; Clegg, Samuel M.; Delapp, Dorothea M.; Sanford, Veronica L.; Bodine, Madeleine R.; McInroy, Rhonda
Gasda, P. J., E. B. Haldeman, R. C. Wiens, W. Rapin, T. F. Bristow, J. C. Bridges, S. P. Schwenzer, B. Clark, K. Herkenhoff, J. Frydenvang, N. L. Lanza, S. Maurice, S. Clegg, D. M. Delapp, V. L. Sanford, M. R. Bodine, and R. McInroy (2017), In situ detection of boron by ChemCam on Mars, Geophys. Res. Lett., doi: 10.1002/2017GL074480.

Filter Total Items: 239
Image: Snowy Egret
April 16, 2008

Snowy Egret

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Snowy Egret
April 16, 2008

Snowy Egret

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Marbled Gowit
March 20, 2008

Marbled Gowit

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: California Brown Pelicans
March 20, 2008

California Brown Pelicans

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Double Crested Cormorants
March 20, 2008

Double Crested Cormorants

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: White-faced Ibis and Gulls
March 6, 2008

White-faced Ibis and Gulls

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: White-faced Ibis and Gulls
March 6, 2008

White-faced Ibis and Gulls

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Double Crested Cormorants
March 6, 2008

Double Crested Cormorants

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: White Pelicans
March 6, 2008

White Pelicans

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: White Pelicans
March 6, 2008

White Pelicans

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: White Pelicans
March 6, 2008

White Pelicans

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: White Pelicans
March 6, 2008

White Pelicans

Birds found in and around the Salton Sea, California.

Attribution: Southwest

Nine USGS Science Centers are administered by the Pacific Regional office, which is headquartered in Sacramento, California.