Publications
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Cone penetration tests and soil borings at the Mason Road site in Green Valley, Solano County, California
In support of a study to investigate the history of the Green Valley Fault, 13 cone penetration test soundings and 3 auger borings were made at the Mason Road site in Green Valley, Solano County, California. Three borings were made at or near two of the cone penetration test soundings. The soils are mostly clayey with a few sandy layers or lenses. Fine-grained soils range from low plasticity sandy
Authors
Michael J. Bennett, Thomas E. Noce, James J. Lienkaemper
Model and parametric uncertainty in source-based kinematic models of earthquake ground motion
Four independent ground-motion simulation codes are used to model the strong ground motion for three earthquakes: 1994 Mw 6.7 Northridge, 1989 Mw 6.9 Loma Prieta, and 1999 Mw 7.5 Izmit. These 12 sets of synthetics are used to make estimates of the variability in ground-motion predictions. In addition, ground-motion predictions over a grid of sites are used to estimate parametric uncertainty for ch
Authors
Stephen H. Hartzell, Arthur Frankel, Pengcheng Liu, Yuehua Zeng, Shariftur Rahman
Some possible causes of and corrections for STS-1 response changes in the Global Seismographic Network
The Global Seismographic Network (GSN) (Figure 1) plays a key role in providing seismic data for global earthquake monitoring (e.g., Benz et al. 2005), earthquake science (e.g., Tsai et al. 2005), and studies of Earth structure (e.g., Dalton et al. 2008). One of the key GSN design goals is to "provide high fidelity digital recordings of all teleseismic ground motions (adequate to resolve at or nea
Authors
C. R. Hutt, A. T. Ringler
Active mountain building and the distribution of core Maxillariinae species in tropical Mexico and Central America
The observation that southeastern Central America is a hotspot for orchid diversity has long been known and confirmed by recent systematic studies and checklists. An analysis of the geographic and elevation distribution demonstrates that the most widespread species of “core” Maxillariinae are all adapted to life near sea level, whereas the most narrowly endemic species are largely distributed in w
Authors
Stephen H. Kirby
The role of adsorbed water on the friction of a layer of submicron particles
Anomalously low values of friction observed in layers of submicron particles deformed in simple shear at high slip velocities are explained as the consequence of a one nanometer thick layer of water adsorbed on the particles. The observed transition from normal friction with an apparent coefficient near μ = 0.6 at low slip speeds to a coefficient near μ = 0.3 at higher slip speeds is attributed to
Authors
Charles G. Sammis, David A. Lockner, Ze’ev Reches
High-frequency Born synthetic seismograms based on coupled normal modes
High-frequency and full waveform synthetic seismograms on a 3-D laterally heterogeneous earth model are simulated using the theory of coupled normal modes. The set of coupled integral equations that describe the 3-D response are simplified into a set of uncoupled integral equations by using the Born approximation to calculate scattered wavefields and the pure-path approximation to modulate the pha
Authors
Fred F. Pollitz
Seismicity of the Earth 1900-2010 Mexico and vicinity
Mexico, located in one of the world's most seismically active regions, lies on three large tectonic plates: the North American plate, Pacific plate, and Cocos plate. The relative motion of these tectonic plates causes frequent earthquakes and active volcanism and mountain building. Mexico's most seismically active region is in southern Mexico where the Cocos plate is subducting northwestward benea
Authors
Susan Rhea, Richard L. Dart, Antonio H. Villaseñor, Gavin P. Hayes, Arthur C. Tarr, Kevin P. Furlong, Harley M. Benz
Recent faulting in western Nevada revealed by multi-scale seismic reflection
The main goal of this study is to compare different reflection methods used to image subsurface structure within different physical environments in western Nevada. With all the methods employed, the primary goal is fault imaging for structural information toward geothermal exploration and seismic hazard estimation. We use seismic CHIRP (a swept-frequency marine acquisition system), weight drop (an
Authors
Roxanna N. Frary, John N. Louie, William J. Stephenson, Jackson K. Odum, Annie Kell, Amy Eisses, Graham M. Kent, Neal W. Driscoll, Robert Karlin, Robert L. Baskin, Satish Pullammanappallil, Lee M. Liberty
Constraints on the long‐period moment‐dip tradeoff for the Tohoku earthquake
Since the work of Kanamori and Given (1981), it has been recognized that shallow, pure dip‐slip earthquakes excite long‐period surface waves such that it is difficult to independently constrain the moment (M0) and the dip (δ) of the source mechanism, with only the product M0 sin(2δ) being well constrained. Because of this, it is often assumed that the primary discrepancies between the moments of s
Authors
Victor C. Tsai, Gavin P. Hayes, Zacharie Duputel
Preface to the Focused Issue on the 22 February 2011 Magnitude 6.2 Christchurch Earthquake
The 22 February 2011 magnitude 6.2 Christchurch earthquake, centered southeast of Christchurch, was part of the aftershock sequence that has been occurring since the September 2010 magnitude 7.1 quake near Darfield, 40 km west of the city. The Christchurch earthquake killed more than 180 people, damaged or destroyed more than 100,000 buildings, and is New Zealand's most deadly disaster since the e
Authors
Erol Kalkan
The role of dyking and fault control in the rapid onset of eruption at Chaitén Volcano, Chile
Rhyolite is the most viscous of liquid magmas, so it was surprising that on 2 May 2008 at Chaitén Volcano, located in Chile’s southern Andean volcanic zone, rhyolitic magma migrated from more than 5 km depth in less than 4 hours and erupted explosively with only two days of detected precursory seismic activity. The last major rhyolite eruption before that at Chaitén was the largest volcanic erupti
Authors
Charles W. Wicks, J. Carlos de la Llera, Luis E. Lara, Jacob B. Lowenstern
Probabilistic seismic hazard assessment including site effects for Evansville, Indiana, and the surrounding region
We provide a probabilistic seismic hazard assessment for the Evansville, Indiana region incorporating information from new surficial geologic mapping efforts on the part of the U.S. Geological Survey (USGS) and the Kentucky and Indiana State Geological Surveys, as well as information on the thickness and properties of near surface soils and their associated uncertainties. The subsurface informatio
Authors
Jennifer S. Haase, Tim Bowling, Robert L. Nowack, Yoon S. Choi, Chris H. Cramer, Oliver S. Boyd, Robert A. Bauer