Publications
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Hypsometry of Titan
Cassini RADAR topography data are used to evaluate Titan’s hypsometric profile, and to make comparisons with other planetary bodies. Titan’s hypsogram is unimodal and strikingly narrow compared with the terrestrial planets. To investigate topographic extremes, a novel variant on the classic hypsogram is introduced, with a logarithmic abscissa to highlight mountainous terrain. In such a plot, the t
Authors
Ralph D. Lorenz, Elizabeth P. Turtle, Bryan Stiles, Alice Le Gall, Alexander Hayes, Oded Aharonson, Charles A. Wood, Ellen Stofan, Randy Kirk
Seismic calibration shots conducted in 2009 in the Imperial Valley, southern California, for the Salton Seismic Imaging Project (SSIP)
Rupture of the southern section of the San Andreas Fault, from the Coachella Valley to the Mojave Desert, is believed to be the greatest natural hazard facing California in the near future. With an estimated magnitude between 7.2 and 8.1, such an event would result in violent shaking, loss of life, and disruption of lifelines (freeways, aqueducts, power, petroleum, and communication lines) that wo
Authors
Janice Murphy, Mark Goldman, Gary Fuis, Michael Rymer, Robert Sickler, Summer Miller, Lesley Butcher, Jason Ricketts, Coyn Criley, Joann Stock, John Hole, Greg Chavez
Slip rate and slip magnitudes of past earthquakes along the Bogd left-lateral strike-slip fault (Mongolia)
We carried out morphotectonic studies along the left-lateral strike-slip Bogd Fault, the principal structure involved in the Gobi-Altay earthquake of 1957 December 4 (published magnitudes range from 7.8 to 8.3). The Bogd Fault is 260 km long and can be subdivided into five main geometric segments, based on variation in strike direction. West to East these segments are, respectively: the West Ih Bo
Authors
M. Rizza, J.-F. Ritz, R. Braucher, R. Vassallo, C. Prentice, Shannon A. Mahan, S. McGill, A. Chauvet, S. Marco, M. Todbileg, S. Demberel, D. Bourles
Liquefaction and other ground failures in Imperial County, California, from the April 4, 2010, El Mayor-Cucapah earthquake
The Colorado River Delta region of southern Imperial Valley, California, and Mexicali Valley, Baja California, is a tectonically dynamic area characterized by numerous active faults and frequent large seismic events. Significant earthquakes that have been accompanied by surface fault rupture and/or soil liquefaction occurred in this region in 1892 (M7.1), 1915 (M6.3; M7.1), 1930 (M5.7), 1940 (M6.9
Authors
Timothy P. McCrink, Cynthia L. Pridmore, John C. Tinsley, Robert R. Sickler, Scott J. Brandenberg, Jonathan P. Stewart
Direction of unsaturated flow in a homogeneous and isotropic hillslope
The distribution of soil moisture in a homogeneous and isotropic hillslope is a transient, variably saturated physical process controlled by rainfall characteristics, hillslope geometry, and the hydrological properties of the hillslope materials. The major driving mechanisms for moisture movement are gravity and gradients in matric potential. The latter is solely controlled by gradients of moistur
Authors
Ning Lu, Basak Sener Kaya, Jonathan W. Godt
Developing seismogenic source models based on geologic fault data
Calculating seismic hazard usually requires input that includes seismicity associated with known faults, historical earthquake catalogs, geodesy, and models of ground shaking. This paper will address the input generally derived from geologic studies that augment the short historical catalog to predict ground shaking at time scales of tens, hundreds, or thousands of years (e.g., SSHAC 1997). A seis
Authors
Kathleen M. Haller, Roberto Basili
Preliminary assessment of channel stability and bed-material transport along Hunter Creek, southwestern Oregon
This preliminary assessment of (1) bed-material transport in the Hunter Creek basin, (2) historical changes in channel condition, and (3) supplementary data needed to inform permitting decisions regarding instream gravel extraction revealed the following: Along the lower 12.4 km (kilometers) of Hunter Creek from its confluence with the Little South Fork Hunter Creek to its mouth, the river has con
Authors
Krista L. Jones, J. Rose Wallick, Jim E. O'Connor, Mackenzie K. Keith, Joseph F. Mangano, John C. Risley
Comparison of main-shock and aftershock fragility curves developed for New Zealand and US buildings
Seismic risk assessment involves the development of fragility functions to express the relationship between ground motion intensity and damage potential. In evaluating the risk associated with the building inventory in a region, it is essential to capture 'actual' characteristics of the buildings and group them so that 'generic building types' can be generated for further analysis of their damage
Authors
S.R. Uma, H. Ryu, N. Luco, A.B. Liel, M. Raghunandan
Coastal subsidence in Oregon, USA during the giant Cascadia earthquake of AD 1700
Quantitative estimates of land-level change during the giant AD 1700 Cascadia earthquake along the Oregon coast are inferred from relative sea-level changes reconstructed from fossil foraminiferal assemblages preserved within the stratigraphic record. A transfer function, based upon a regional training set of modern sediment samples from Oregon estuaries, is calibrated to fossil assemblages in seq
Authors
A. D. Hawkes, B. P. Horton, A. R. Nelson, C. H. Vane, Y. Sawai
Improved earthquake monitoring in the central and eastern United States in support of seismic assessments for critical facilities
Evaluation of seismic monitoring capabilities in the central and eastern United States for critical facilities - including nuclear powerplants - focused on specific improvements to understand better the seismic hazards in the region. The report is not an assessment of seismic safety at nuclear plants. To accomplish the evaluation and to provide suggestions for improvements using funding from the A
Authors
William S. Leith, Harley M. Benz, Robert B. Herrmann
Albuquerque Seismological Laboratory--50 years of global seismology
The U.S. Geological Survey Albuquerque Seismological Laboratory is about 15 miles southeast of Albuquerque on the Pueblo of Isleta, adjacent to Kirtland Air Force Base. The Albuquerque Seismological Laboratory supports the Global Seismographic Network Program and the Advanced National Seismic System through the installation, operation, and maintenance of seismic stations around the world and serve
Authors
C. R. Hutt, Jon Peterson, Lind Gee, John Derr, Adam Ringler, David Wilson
Earthquakes in Mississippi and vicinity 1811-2010
This map summarizes two centuries of earthquake activity in Mississippi. Work on the Mississippi map was done in collaboration with the Mississippi Department of Environmental Quality, Office of Geology. The earthquake data plotted on the map are from several sources: the Mississippi Department of Environmental Quality, the Center for Earthquake Research and Information, the National Center for Ea
Authors
Richard L. Dart, Michael B. E. Bograd