Publications
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Dynamics of the Yellowstone hydrothermal system
The Yellowstone Plateau Volcanic Field is characterized by extensive seismicity, episodes of uplift and subsidence, and a hydrothermal system that comprises more than 10,000 thermal features, including geysers, fumaroles, mud pots, thermal springs, and hydrothermal explosion craters. The diverse chemical and isotopic compositions of waters and gases derive from mantle, crustal, and...
Authors
Shaul Hurwitz, Jacob B. Lowenstern
Interannual observations and quantification of summertime H2O ice deposition on the Martian CO2 ice south polar cap
The spectral signature of water ice was observed on Martian south polar cap in 2004 by the Observatoire pour l'Mineralogie, l'Eau les Glaces et l'Activite (OMEGA) ( Bibring et al., 2004). Three years later, the OMEGA instrument was used to discover water ice deposited during southern summer on the polar cap ( Langevin et al., 2007). However, temporal and spatial variations of these water...
Authors
Adrian J. Brown, Sylvain Piqueux, Timothy N. Titus
Straddling the tholeiitic/calc-alkaline transition: The effects of modest amounts of water on magmatic differentiation at Newberry Volcano, Oregon
Melting experiments have been performed at 1 bar (anhydrous) and 1- and 2-kbar H2O-saturated conditions to study the effect of water on the differentiation of a basaltic andesite. The starting material was a mafic pumice from the compositionally zoned tuff deposited during the ~75 ka caldera-forming eruption of Newberry Volcano, a rear-arc volcanic center in the central Oregon Cascades...
Authors
Ben E. Mandler, Julie M. Donnelly-Nolan, Timothy L. Grove
Laboratory generated M -6 earthquakes
We consider whether mm-scale earthquake-like seismic events generated in laboratory experiments are consistent with our understanding of the physics of larger earthquakes. This work focuses on a population of 48 very small shocks that are foreshocks and aftershocks of stick–slip events occurring on a 2.0 m by 0.4 m simulated strike-slip fault cut through a large granite sample. Unlike...
Authors
Gregory C. McLaskey, Brian D. Kilgore, David A. Lockner, Nicholas M. Beeler
Chemical complexity and source of the White River Ash, Alaska and Yukon
The White River Ash, a prominent stratigraphic marker bed in Alaska (USA) and Yukon (Canada), consists of multiple compositional units belonging to two geochemical groups. The compositional units are characterized using multiple criteria, with combined glass and ilmenite compositions being the best discriminators. Two compositional units compose the northern group (WRA-Na and WRA-Nb)...
Authors
S.J. Preece, Robert G. McGimsey, J.A. Westgate, N.J.G. Pearce, W.K. Hartmann, W.T. Perkins
Shaking from injection-induced earthquakes in the central and eastern United States
In this study I consider the ground motions generated by 11 moderate (Mw4.0-5.6) earthquakes in the central and eastern United States that are thought or suspected to be induced by fluid injection. Using spatially rich intensity data from the USGS “Did You Feel It?” system, I show that the distance decay of intensities for all events is consistent with that observed for tectonic...
Authors
Susan E. Hough
Seismological and geodetic constraints on the 2011 Mw5.3 Trinidad, Colorado earthquake and induced deformation in the Raton Basin
The Raton Basin of southern Colorado and northern New Mexico is an actively produced hydrocarbon basin that has experienced increased seismicity since 2001, including the August 2011 Mw5.3 Trinidad normal faulting event. Following the 2011 earthquake, regional seismic observations were used to relocate 21 events, including the 2011 main shock, two foreshocks, and 13 aftershocks...
Authors
William D. Barnhart, Harley M. Benz, Gavin P. Hayes, Justin L. Rubinstein, E. Bergman
Seismicity of the Earth 1900-2013 offshore British Columbia-southeastern Alaska and vicinity
The tectonics of the Pacific margin of North America between Vancouver Island and south-central Alaska are dominated by the northwest motion of the Pacific plate with respect to the North America plate at a velocity of approximately 50 mm/yr. In the south of this mapped region, convergence between the northern extent of the Juan de Fuca plate (also known as the Explorer microplate) and...
Authors
Gavin P. Hayes, Gregory M. Smoczyk, Jonathan G. Ooms, Daniel E. McNamara, Kevin P. Furlong, Harley M. Benz, Antonio H. Villaseñor
Global assessment of human losses due to earthquakes
Current studies have demonstrated a sharp increase in human losses due to earthquakes. These alarming levels of casualties suggest the need for large-scale investment in seismic risk mitigation, which, in turn, requires an adequate understanding of the extent of the losses, and location of the most affected regions. Recent developments in global and uniform datasets such as instrumental...
Authors
Vitor Silva, Kishor S. Jaiswal, Graeme Weatherill, Helen Crowley
The 2001-present induced earthquake sequence in the Raton Basin of northern New Mexico and southern Colorado
We investigate the ongoing seismicity in the Raton Basin and find that the deep injection of wastewater from the coal‐bed methane field is responsible for inducing the majority of the seismicity since 2001. Many lines of evidence indicate that this earthquake sequence was induced by wastewater injection. First, there was a marked increase in seismicity shortly after major fluid injection...
Authors
Justin L. Rubinstein, William L. Ellsworth, Arthur F. McGarr, Harley M. Benz
Report on workshop to incorporate basin response in the design of tall buildings in the Puget Sound region, Washington
On March 4, 2013, the City of Seattle and the U.S. Geological Survey (USGS) convened a workshop of 25 engineers and seismologists to provide recommendations to the City for the incorporation of amplification of earthquake ground shaking by the Seattle sedimentary basin in the design of tall buildings in Seattle. The workshop was initiated and organized by Susan Chang, a geotechnical...
Authors
Susan Chang, Arthur D. Frankel, Craig S. Weaver
A generalization of the double-corner-frequency source spectral model and its use in the SCEC BBP validation exercise
The stochastic method of simulating ground motions requires the specification of the shape and scaling with magnitude of the source spectrum. The spectral models commonly used are either single-corner-frequency or double-corner-frequency models, but the latter have no flexibility to vary the high-frequency spectral levels for a specified seismic moment. Two generalized double-corner...
Authors
David M. Boore, Carola Di Alessandro, Norman A. Abrahamson