Publications
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Nature, distribution, and origin of Titan’s Undifferentiated Plains
The Undifferentiated Plains on Titan, first mapped by Lopes et al. (Lopes, R.M.C. et al., 2010. Icarus, 205, 540–588), are vast expanses of terrains that appear radar-dark and fairly uniform in Cassini Synthetic Aperture Radar (SAR) images. As a result, these terrains are often referred to as “blandlands”. While the interpretation of several other geologic units on Titan – such as dunes, lakes, an
Authors
Rosaly Lopes, M. J. Malaska, A. Solomonidou, Gall A. Le, M.A. Janssen, Catherine D. Neish, E. P. Turtle, S. P. D. Birch, A. G. Hayes, J. Radebaugh, A. Coustenis, A. Schoenfeld, B.W. Stiles, Randolph L. Kirk, K. L. Mitchell, E. R. Stofan, K. J. Lawrence
Three-dimensional surface deformation derived from airborne interferometric UAVSAR: Application to the Slumgullion Landslide
In order to provide surface geodetic measurements with “landslide-wide” spatial coverage, we develop and validate a method for the characterization of 3-D surface deformation using the unique capabilities of the Uninhabited Aerial Vehicle Synthetic Aperture Radar (UAVSAR) airborne repeat-pass radar interferometry system. We apply our method at the well-studied Slumgullion Landslide, which is 3.9 k
Authors
Brent G. Delbridge, Roland Burgmann, Eric Fielding, Scott Hensley, William Schulz
Extracting accurate and precise topography from LROC narrow angle camera stereo observations
The Lunar Reconnaissance Orbiter Camera (LROC) includes two identical Narrow Angle Cameras (NAC) that each provide 0.5 to 2.0 m scale images of the lunar surface. Although not designed as a stereo system, LROC can acquire NAC stereo observations over two or more orbits using at least one off-nadir slew. Digital terrain models (DTMs) are generated from sets of stereo images and registered to profil
Authors
M. R. Henriksen, M. R. Manheim, K. N. Burns, P. Seymour, E. J. Speyerer, A. Deran, A. K. Boyd, Elpitha Howington-Kraus PR, Mark R. Rosiek, Brent A. Archinal, M. S. Robinson
A study of the 2015 Mw 8.3 Illapel earthquake and tsunami: Numerical and analytical approaches
The September 16, 2015 Illapel, Chile earthquake
triggered a large tsunami, causing both economic losses and
fatalities. To study the coastal effects of this earthquake, and to
understand how such hazards might be accurately modeled in the
future, different finite fault models of the Illapel rupture are used to
define the initial condition for tsunami simulation. The numerical
code Non-hydrostatic
Authors
Mauricio Fuentes, Sebastian Riquelme, Gavin P. Hayes, Miguel Medina, Diego Melgar, Gabriel Vargas, Jose Gonzalez, Angelo Villalobos
Likelihood testing of seismicity-based rate forecasts of induced earthquakes in Oklahoma and Kansas
Likelihood testing of induced earthquakes in Oklahoma and Kansas has identified the parameters that optimize the forecasting ability of smoothed seismicity models and quantified the recent temporal stability of the spatial seismicity patterns. Use of the most recent 1-year period of earthquake data and use of 10–20-km smoothing distances produced the greatest likelihood. The likelihood that the lo
Authors
Morgan P. Moschetti, Susan M. Hoover, Charles Mueller
NGA-West2 equations for predicting vertical-component PGA, PGV, and 5%-damped PSA from shallow crustal earthquakes
We present ground motion prediction equations (GMPEs) for computing natural log means and standard deviations of vertical-component intensity measures (IMs) for shallow crustal earthquakes in active tectonic regions. The equations were derived from a global database with M 3.0–7.9 events. The functions are similar to those for our horizontal GMPEs. We derive equations for the primary M- and distan
Authors
Jonathan P. Stewart, David M. Boore, Emel Seyhan, Gail M. Atkinson
Summary of the GK15 ground‐motion prediction equation for horizontal PGA and 5% damped PSA from shallow crustal continental earthquakes
We present a revised ground‐motion prediction equation (GMPE) for computing medians and standard deviations of peak ground acceleration (PGA) and 5% damped pseudospectral acceleration (PSA) response ordinates of the horizontal component of randomly oriented ground motions to be used for seismic‐hazard analyses and engineering applications. This GMPE is derived from the expanded Next Generation Att
Authors
Vladimir; Graizer, Erol Kalkan
Earthquake forecast for the Wasatch Front region of the Intermountain West
The Working Group on Utah Earthquake Probabilities has assessed the probability of large earthquakes in the Wasatch Front region. There is a 43 percent probability of one or more magnitude 6.75 or greater earthquakes and a 57 percent probability of one or more magnitude 6.0 or greater earthquakes in the region in the next 50 years. These results highlight the threat of large earthquakes in the reg
Authors
Christopher B. DuRoss
Postseismic gravity change after the 2006–2007 great earthquake doublet and constraints on the asthenosphere structure in the central Kuril Islands
Large earthquakes often trigger viscoelastic adjustment for years to decades depending on the rheological properties and the nature and spatial extent of coseismic stress. The 2006 Mw8.3 thrust and 2007 Mw8.1 normal fault earthquakes of the central Kuril Islands resulted in significant postseismic gravity change in Gravity Recovery and Climate Experiment (GRACE) but without a discernible coseismic
Authors
Shin-Chan Han, Jeanne Sauber, Fred Pollitz
A revised surface age for the North Polar Layered Deposits of Mars
The North Polar Layered Deposits (NPLD) of Mars contain a complex stratigraphy that has been suggested to retain a record of past eccentricity- and obliquity-forced climate changes. The surface accumulation rate in the current climate can be constrained by the crater retention age. We scale NPLD crater diameters to account for icy target strength and compare surface age using a new production func
Authors
Margaret E. Landis, Shane Byrne, Ingrid J. Daubar, Kenneth E. Herkenhoff, Colin M. Dundas
Tomographic Rayleigh-wave group velocities in the Central Valley, California centered on the Sacramento/San Joaquin Delta
If shaking from a local or regional earthquake in the San Francisco Bay region were to rupture levees in the Sacramento/San Joaquin Delta then brackish water from San Francisco Bay would contaminate the water in the Delta: the source of fresh water for about half of California. As a prelude to a full shear-wave velocity model that can be used in computer simulations and further seismic hazard anal
Authors
Jon Peter B. Fletcher, Jemile Erdem, Kevin Seats, Jesse Lawrence
An overview of current applications, challenges, and future trends in distributed process-based models in hydrology
Process-based hydrological models have a long history dating back to the 1960s. Criticized by some as over-parameterized, overly complex, and difficult to use, a more nuanced view is that these tools are necessary in many situations and, in a certain class of problems, they are the most appropriate type of hydrological model. This is especially the case in situations where knowledge of flow paths
Authors
Simone Fatichi, Enrique R. Vivoni, Fred L Odgen, Valeriy Y Ivanov, Benjamin B. Mirus, David Gochis, Charles W Downer, Matteo Camporese, Jason H Davison, Brian A. Ebel, Norm Jones, Jon Kim, Giuseppe Mascaro, Richard G. Niswonger, Pedro Restrepo, Riccardo Rigon, Chaopeng Shen, Mauro Sulis, David Tarboton