Publications
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Geometry and subsidence history of the Dead Sea basin: A case for fluid-induced mid-crustal shear zone?
Pull‐apart basins are narrow zones of crustal extension bounded by strike‐slip faults that can serve as analogs to the early stages of crustal rifting. We use seismic tomography, 2‐D ray tracing, gravity modeling, and subsidence analysis to study crustal extension of the Dead Sea basin (DSB), a large and long‐lived pull‐apart basin along the Dead Sea transform (DST). The basin gradually shallows s
Authors
Uri S. ten Brink, C.H. Flores
The influence of wave energy and sediment transport on seagrass distribution
A coupled hydrodynamic and sediment transport model (Delft3D) was used to simulate the water levels, waves, and currents associated with a seagrass (Zostera marina) landscape along a 4-km stretch of coast in Puget Sound, WA, USA. A hydroacoustic survey of seagrass percent cover and nearshore bathymetry was conducted, and sediment grain size was sampled at 53 locations. Wave energy is a primary fac
Authors
Andrew W. Stevens, Jessica R. Lacy
Planet-wide sand motion on mars
Prior to Mars Reconnaissance Orbiter data, images of Mars showed no direct evidence for dune and ripple motion. This was consistent with climate models and lander measurements indicating that winds of sufficient intensity to mobilize sand were rare in the low-density atmosphere. We show that many sand ripples and dunes across Mars exhibit movement of as much as a few meters per year, demonstrating
Authors
N.T. Bridges, M.C. Bourke, Paul E. Geissler, M. E. Banks, C. Colon, S. Diniega, M.P. Golombek, C.J. Hansen, S. Mattson, A. S. McEwen, M. T. Mellon, N. Stantzos, B.J. Thomson
Using rocks to reveal the inner workings of magma chambers below volcanoes in Alaska’s National Parks
Alaska is one of the most vigorously volcanic regions on the planet, and Alaska’s national parks are home to many of the state’s most active volcanoes. These pose both local and more distant hazards in the form of lava and pyroclastic flows, lahars (mudflows), ash clouds, and ash fall. Alaska’s volcanoes lie along the arc of the Aleutian-Alaskan subduction zone, caused as the oceanic Pacific plate
Authors
Michelle L. Coombs, Charles R. Bacon
Displacement fields from point cloud data: Application of particle imaging velocimetry to landslide geodesy
Acquiring spatially continuous ground-surface displacement fields from Terrestrial Laser Scanners (TLS) will allow better understanding of the physical processes governing landslide motion at detailed spatial and temporal scales. Problems arise, however, when estimating continuous displacement fields from TLS point-clouds because reflecting points from sequential scans of moving ground are not def
Authors
Arjun Aryal, Benjamin A. Brooks, Mark E. Reid, Gerald W. Bawden, Geno Pawlak
A new perspective on the geometry of the San Andreas Fault in southern California and its relationship to lithospheric structure
The widely held perception that the San Andreas fault (SAF) is vertical or steeply dipping in most places in southern California may not be correct. From studies of potential‐field data, active‐source imaging, and seismicity, the dip of the SAF is significantly nonvertical in many locations. The direction of dip appears to change in a systematic way through the Transverse Ranges: moderately southw
Authors
Gary S. Fuis, Daniel S. Scheirer, Victoria E. Langenheim, Monica D. Kohler
Influence of fault trend, bends, and convergence on shallow structure and geomorphology of the Hosgri strike-slip fault, offshore central California
We mapped an ∼94-km-long portion of the right-lateral Hosgri fault zone in offshore central California using a dense network of high-resolution seismic reflection profiles, marine magnetic data, and multibeam bathymetry. These data document the location, length, and continuity of multiple fault strands, highlight fault-zone heterogeneity, and demonstrate the importance of fault trend, fault bends,
Authors
Samuel Y. Johnson, Janet Tilden Watt
Arrival and expansion of the invasive foraminifera Trochammina hadai Uchio in Padilla Bay, Washington
Trochammina hadai Uchio, a benthic foraminifera native to Japanese estuaries, was first identified as an invasive in 1995 in San Francisco Bay and later in 16 other west coast estuaries. To investigate the timing of the arrival and expansion of this invasive species in Padilla Bay, Washington, we analyzed the distribution of foraminifera in two surface samples collected in 1971, in nine surface sa
Authors
Mary McGann, Eric E. Grossman, Renee K. Takesue, Dan Penttila, John P. Walsh, Reide Corbett
Solar thematic maps for space weather operations
Thematic maps are arrays of labels, or "themes", associated with discrete locations in space and time. Borrowing heavily from the terrestrial remote sensing discipline, a numerical technique based on Bayes' theorem captures operational expertise in the form of trained theme statistics, then uses this to automatically assign labels to solar image pixels. Ultimately, regular thematic maps of the sol
Authors
E. Joshua Rigler, Steven M. Hill, Alysha A. Reinard, Robert A. Steenburgh
FOP 2012 stop, Honey Lake fault, Doyle, CA
The Honey Lake fault system (HLFS) strikes north-northwestward across Long Valley near Doyle, CA and is part of a network of active, dextral strike-slip faults in the northern Walker Lane (Figure 1). Geologic investigations of a right-laterally offset terrace riser along the north bank of Long Valley Creek, which we refer to as site 1 (Figure 2), indicate a latest Quaternary slip rate of 1.1-2. 6
Authors
Ryan Gold, Richard W. Briggs, Anthony Crone, Steve Angster
Grizzly Valley fault system, Sierra Valley, CA
The Grizzly Valley fault system (GVFS) strikes northwestward across Sierra Valley, California and is part of a network of active, dextral strike-slip faults in the northern Walker Lane (Figure 1). To investigate Quaternary motion across the GVFS, we analyzed high-resolution (0.25 m) airborne LiDAR data (Figure 2) in combination with six, high-resolution, P-wave, seismic-reflection profiles [Gold a
Authors
Ryan Gold, William Stephenson, Jack Odum, Rich Briggs, Anthony Crone, Steve Angster
Probabilistic Relationships between Ground‐Motion Parameters and Modified Mercalli Intensity in California
We use a database of approximately 200,000 modified Mercalli intensity (MMI) observations of California earthquakes collected from USGS "Did You Feel It?" (DYFI) reports, along with a comparable number of peak ground-motion amplitudes from California seismic networks, to develop probabilistic relationships between MMI and peak ground velocity (PGV), peak ground acceleration (PGA), and 0.3-s, 1-s,
Authors
C.B. Worden, David J. Wald, D.A. Rhoades