Publications
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Tropical storm-induced landslide potential using combined field monitoring and numerical modeling
When heavy rainfall, such as that associated with tropical storms, falls on steep hillsides, shallow landslides are often one of the damaging consequences. To assess landslide potential from heavy rainfall, a strategy of combined numerical simulation and field monitoring of variably saturated hillslope conditions is developed. To test the combined method, hillslope hydrologic data from paired fiel
Authors
Pan Chen, Ning Lu, Giuseppe Formetta, Jonathan W. Godt, Alexandra Wayllace
Climate dictates magnitude of asymmetry in soil depth and hillslope gradient
Hillslope asymmetry is often attributed to differential eco‐hydro‐geomorphic processes resulting from aspect‐related differences in insolation. At midlatitudes, polar facing hillslopes are steeper, wetter, have denser vegetation, and deeper soils than their equatorial facing counterparts. We propose that at regional scales, the magnitude in insolation‐driven hillslope asymmetry is sensitive to var
Authors
Assaf Inbar, Petter Nyman, Francis K. Rengers, Patrick N. J. Lane, Gary J. Sheridan
Correcting spacecraft jitter in HiRISE images
Mechanical oscillations or vibrations on spacecraft, also called pointing jitter, cause geometric distortions and/or smear in high-resolution digital images acquired from orbit. Geometric distortion is especially a problem with pushbroom sensors, such as the High Resolution Imaging Science Experiment (HiRISE) instrument on-board the Mars Reconnaissance Orbiter (MRO). Geometric distortions occur at
Authors
S.S. Sutton, A.K. Boyd, Randolph L. Kirk, Debbie Cook, Jean Backer, A. Fennema, R. Heyd, A.S. McEwen, S.D. Mirchandani
Mars global digital dune database (MGD3)—Composition, stability, and thermal inertia
The Mars Global Digital Dune Database (MGD3) is an online repository that has catalogued dune fields larger than 1 km2 located between latitudes 90° N. and 90° S. The work presented here expands upon previous MGD3 open-file reports, with a new emphasis upon characterizing dune fields through composition, stability, and thermal inertia. Included in this latest addition is a detailed compositional a
Authors
Amber L. Gullikson, Rosalyn K. Hayward, Timothy N. Titus, Heather Charles, Lori K. Fenton, Rachael H. Hoover, Nathaniel E. Putzig
Earthquake catalogs for the USGS National Seismic Hazard Maps
We describe a methodology that has been developed at the U.S. Geological Survey for making earthquake catalogs for seismic hazard analysis and review the status of the catalogs for the conterminous United States. A new catalog is assembled from several pre‐existing catalogs. Uniform moment magnitudes and related parameters for estimating unbiased seismicity rates are calculated. Duplicates, explos
Authors
Charles Mueller
Development of a geodetic component for the U.S. West Coast Earthquake Early Warning System
An earthquake early warning (EEW) system, ShakeAlert, is under development for the West Coast of the United States. This system currently uses the first few seconds of waveforms recorded by seismic instrumentation to rapidly characterize earthquake magnitude, location, and origin time; ShakeAlert recently added a seismic line source algorithm. For large to great earthquakes, magnitudes estimated f
Authors
Jessica R. Murray, Brendan W. Crowell, R. Grapenthin, Kathleen Hodgkinson, John O. Langbein, Timothy Melbourne, Diego Melgar, Sarah E. Minson, David A. Schmidt
Reported investments in earthquake mitigation top $73 to $80 billion in the San Francisco Bay Area, California, since the 1989 Loma Prieta earthquake
The purpose of this report is to provide a compilation of structural retrofits and replacements of older buildings and infrastructure in the San Francisco Bay Area that have either been completed since 1989 or that are in progress as of October 2018. For the purposes of this report, all or parts of nine Bay Area counties were included: Alameda, Contra Costa, Marin, Napa, San Francisco, San Mateo,
Authors
Thomas M. Brocher, Kerri Gefeke, John Boatwright, Keith L. Knudsen
Cryovolcanic rates on Ceres revealed by topography
Cryovolcanism, defined here as the extrusion of icy material from depth, may be an important planetary phenomenon in shaping the surfaces of many worlds in the outer Solar System and revealing their thermal histories1,2,3. However, the physics, chemistry and ubiquity of this geologic process remain poorly understood, especially in comparison to the better-studied silicate volcanism on the terrestr
Authors
M. M. Sori, H. G. Sizemore, S. Byrne, A. M. Bramson, Michael T. Bland, N. T. Stein, C. T. Russell
Tropical cyclone projections: Changing climate threats for Pacific Island defense installations
Potential changing climate threats in the tropical and subtropical North Pacific Ocean were assessed, using coupled ocean-atmosphere and atmosphere-only general circulation models, to explore their response to projected increasing greenhouse gas emissions. Tropical cyclone occurrence, described by their frequency and intensity, near islands housing major U.S. defense installations was the primary
Authors
Matthew J. Widlansky, Hariharasubramanian Annamalai, Stephen B. Gingerich, Curt D. Storlazzi, John J. Marra, Kevin I. Hodges, Barry Choy, Akio Kitoh
Near-surface environmentally forced changes in the Ross Ice Shelf observed with ambient seismic noise
Continuous seismic observations across the Ross Ice Shelf reveal ubiquitous ambient res-
onances at frequencies >5 Hz. These firn-trapped surface wave signals arise through wind
and snow bedform interactions coupled with very low velocity structures. Progressive and long-term spectral changes are associated with surface snow redistribution by wind
and with a January 2016 regional melt event. Mo
Authors
J. Chaput, R. C. Aster, D. McGrath, M.G.W. Baker, Robert E. Anthony, P. Gerstoft, P. Bromirski, A. Nyblade, R.A. Stephen, D. Wiens
Erratum to The 2013–2016 induced earthquakes in Harper and Sumner Counties, southern Kansas
The authors identified two sets of minor errors in the paper by Rubinstein et al. (2018), which are corrected here.
Authors
Justin L. Rubinstein, William L. Ellsworth, Sara L. Dougherty
Interseismic ground deformation and fault slip rates in the greater San Francisco Bay Area from two decades of space geodetic data
The detailed spatial variations of strain accumulation and creep on major faults in the northern San Francisco Bay Area (North Bay), which are important for seismic potential and evaluation of natural hazards, remain poorly understood. Here we combine interferometric synthetic aperture radar data from the ERS‐1/2 and Envisat satellites between 1992 and 2010 with continuous and campaign GPS data to
Authors
Wenbin Xu, Songbo Wu, Kathryn Materna, Robert Nadeau, Michael Floyd, Gareth J. Funning, Estelle Chaussard, Christopher W. Johnson, Jessica R. Murray, Xiaoling Ding, Roland Burgmann