Publications
Filter Total Items: 7512
Geology of the MER 2003 "Elysium" candidate landing site in southeastern Utopia Planitia, Mars Geology of the MER 2003 "Elysium" candidate landing site in southeastern Utopia Planitia, Mars
The NASA Mars Exploration Rover (MER) Project has been considering a landing-site ellipse designated EP78B2 in southeastern Utopia Planitia, southwest of Elysium Mons. The site appears to be relatively safe for a MER landing site because of its predicted low wind velocities in mesoscale atmospheric circulation models and its low surface roughness at various scales as indicated by...
Authors
Kenneth L. Tanaka, Michael H. Carr, James A. Skinner, Martha S. Gilmore, Trent M. Hare
Debris-flow deposits and watershed erosion rates near southern Death Valley, CA, United States Debris-flow deposits and watershed erosion rates near southern Death Valley, CA, United States
No abstract available.
Authors
K. M. Schmidt, C.M. Menges
Is a powerful quake likely to strike in the next 30 years? Is a powerful quake likely to strike in the next 30 years?
No abstract available.
Authors
Andrew J. Michael, Stephanie L. Ross, Robert W. Simpson, Mary Lou Zoback, David P. Schwartz, Michael L. Blanpied
Preliminary volcano-hazard assessment for Great Sitkin Volcano, Alaska Preliminary volcano-hazard assessment for Great Sitkin Volcano, Alaska
Great Sitkin Volcano is a composite andesitic stratovolcano on Great Sitkin Island (51°05’ N latitude, 176°25’ W longitude), a small (14 x 16 km), circular volcanic island in the western Aleutian Islands of Alaska. Great Sitkin Island is located about 35 kilometers northeast of the community of Adak on Adak Island and 130 kilometers west of the community of Atka on Atka Island. Great...
Authors
Christopher F. Waythomas, Thomas P. Miller, Christopher J. Nye
Volcano seismology Volcano seismology
A fundamental goal of volcano seismology is to understand active magmatic systems, to characterize the configuration of such systems, and to determine the extent and evolution of source regions of magmatic energy. Such understanding is critical to our assessment of eruptive behavior and its hazardous impacts. With the emergence of portable broadband seismic instrumentation, availability...
Authors
B. Chouet
The debris-flow rheology myth The debris-flow rheology myth
Models that employ a fixed rheology cannot yield accurate interpretations or predictions of debris-flow motion, because the evolving behavior of debris flows is too complex to be represented by any rheological equation that uniquely relates stress and strain rate. Field observations and experimental data indicate that debris behavior can vary from nearly rigid to highly fluid as a...
Authors
R.M. Iverson
Hilbert-Huang transform analysis of dynamic and earthquake motion recordings Hilbert-Huang transform analysis of dynamic and earthquake motion recordings
This study examines the rationale of Hilbert-Huang transform (HHT) for analyzing dynamic and earthquake motion recordings in studies of seismology and engineering. In particular, this paper first provides the fundamentals of the HHT method, which consist of the empirical mode decomposition (EMD) and the Hilbert spectral analysis. It then uses the HHT to analyze recordings of hypothetical...
Authors
R.R. Zhang, S. Ma, E. Safak, S. Hartzell
Estimating debris-flow probability using fan stratigraphy, historic records, and drainage-basin morphology, Interstate 70 highway corridor, central Colorado, U.S.A Estimating debris-flow probability using fan stratigraphy, historic records, and drainage-basin morphology, Interstate 70 highway corridor, central Colorado, U.S.A
We have used stratigraphic and historic records of debris-flows to estimate mean recurrence intervals of past debris-flow events on 19 fans along the Interstate 70 highway corridor in the Front Range of Colorado. Estimated mean recurrence intervals were used in the Poisson probability model to estimate the probability of future debris-flow events on the fans. Mean recurrence intervals...
Authors
J. A. Coe, J. W. Godt, M. Parise, A. Moscariello
Causes of coral reef degradation Causes of coral reef degradation
No abstract available.
Authors
R.B. Aronson, J.F. Bruno, W.F. Precht, P.W. Glynn, C. D. Harvell, L. Kaufman, C.S. Rogers, E.A. Shinn, J.F. Valentine, J.M. Pandolfi, R.H. Bradbury, E. Sala, T.P. Hughes, K.A. Bjorndal, R.G. Cooke, D. McArdle, L. McClenachan, M.J.H. Newman, G. Paredes, R.R. Warner, J.B.C. Jackson, A.H. Baird, D.R. Bellwood, S.R. Connolly, C. Folke, R. Grosberg, O. Hoegh-Guldberg, J. Kleypas, J.M. Lough, P. Marshall, M. Nystram, S.R. Palumbi, B. Rosen, J. Roughgarden
Volcanic debris flows in developing countries - The extreme need for public education and awareness of debris-flow hazards Volcanic debris flows in developing countries - The extreme need for public education and awareness of debris-flow hazards
In many developing countries, volcanic debris flows pose a significant societal risk owing to the distribution of dense populations that commonly live on or near a volcano. At many volcanoes, modest volume (up to 500,000 m 3) debris flows are relatively common (multiple times per century) and typically flow at least 5 km along established drainages. Owing to typical debris-flow...
Authors
J. J. Major, S. P. Schilling, C.R. Pullinger
Documentation for 2003 USGS Seismic Hazard Maps for Puerto Rico and the U.S. Virgin Islands Documentation for 2003 USGS Seismic Hazard Maps for Puerto Rico and the U.S. Virgin Islands
No abstract available.
Authors
C.S. Mueller, A.D. Frankel, M.D. Petersen, E. V. Leyendecker
Emergency Assessment of Debris-Flow Hazards from Basins Burned by the Grand Prix and Old Fires of 2003, Southern California Emergency Assessment of Debris-Flow Hazards from Basins Burned by the Grand Prix and Old Fires of 2003, Southern California
These maps present preliminary assessments of the probability of debris-flow activity and estimates of peak discharges that can potentially be generated by debris flows issuing from basins burned by the Old and Grand Prix Fires of October 2003 in southern California in response to the 25-year, 10-year, and 2-year recurrence, 1-hour duration rain storms. The probability maps are based on...
Authors
Susan H. Cannon, Joseph E. Gartner, Michael G. Rupert, John A. Michael, Dean Djokic, Sreeresh Sreedhar