Publications
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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
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