Publications
Filter Total Items: 7240
Aftershocks are well aligned with the background stress field, contradicting the hypothesis of highly-heterogeneous crustal stress
It has been proposed that the crustal stress field contains small-length-scale heterogeneity of much larger amplitude than the uniform background stress. This model predicts that earthquake focal mechanisms should reflect the loading stress rather than the uniform background stress. So, if the heterogeneous stress hypothesis is correct, focal mechanisms before and after a large earthquake should a
Authors
Jeanne L. Hardebeck
Inelastic off-fault response and three-dimensional dynamics of earthquake rupture on a strike-slip fault
Large dynamic stress off the fault incurs an inelastic response and energy loss, which contributes to the fracture energy, limiting the rupture and slip velocity. Using an explicit finite element method, we model three-dimensional dynamic ruptures on a vertical strike-slip fault in a homogeneous half-space. The material is subjected to a pressure-dependent Drucker-Prager yield criterion. Initial s
Authors
D. J. Andrews, Shuo Ma
Method for calculating self-noise spectra and operating ranges for seismographic inertial sensors and recorders
Understanding the performance of sensors and recorders is prerequisite to making appropriate use of them in seismology and earthquake engineering. This paper explores a critical aspect of instrument performance, the “self” noise level of the device and the amplitude range it can usefully record. Self noise limits the smallest signals, while instrument clipping level creates the upper limit (above
Authors
John R. Evans, F. Followill, Charles R. Hutt, R.P. Kromer, R.L. Nigbor, A. T. Ringler, J.M. Steim, E. Wielandt
Reply to “Comment on ‘Near-surface location, geometry, and velocities of the Santa Monica fault zone, Los Angeles, California’ by R. D. Catchings, G. Gandhok, M. R. Goldman, D. Okaya, M. J. Rymer, and G. W. Bawden” by T. L. Pratt and J. F. Dolan
In a comment on our 2008 paper (Catchings, Gandhok, et al., 2008) on the Santa Monica fault in Los Angeles, California, Pratt and Dolan (2010) (herein referred to as P&D) cite numerous objections to our work, inferring that our study is flawed. However, as shown in our reply, their objections contradict their own published works, published works of others, and proven seismic methodologies. Rather
Authors
Rufus D. Catchings, Michael J. Rymer, Mark R. Goldman, Gerald W. Bawden
Mapping products of Titan's surface
Remote sensing instruments aboard the Cassini spacecraft have been observed the surface of Titan globally in the infrared and radar wavelength ranges as well as locally by the Huygens instruments revealing a wealth of new morphological features indicating a geologically active surface. We present a summary of mapping products of Titan's surface derived from data of the remote sensing instruments o
Authors
Katrin Stephan, Ralf Jaumann, Erich Karkoschka, Randolph L. Kirk, Jason W. Barnes, Martin G. Tomasko, Elizabeth P. Turtle, Lucille Le Corre, Mirjam Langhans, Stéphane Le Mouélic, Ralph D. Lorenz, Jason Perry
Climate change in the federated states of Micronesia: Food and water security, climate risk management, and adaptive strategies
This is a report of findings following research and a three-week field assessment (April 2009) of the Federated States of Micronesia (FSM) in response to nation-wide marine inundation by extreme tides (December 2007, September 2008, December 2008).3 The study was conducted at the request of the US Department of Agriculture Forest Service and the state and federal governments of FSM.
Authors
Charles H. Fletcher, Bruce M. Richmond
Geomorphic knobs of Candor Chasma, Mars: New Mars Reconnaissance Orbiter data and comparisons to terrestrial analogs
High Resolution Imaging Science Experiment (HiRISE) imagery and digital elevation models of the Candor Chasma region of Valles Marineris, Mars, reveal prominent and distinctive positive-relief knobs amidst light-toned layers. Three classifications of knobs, Types 1, 2, and 3, are distinguished from a combination of HiRISE and Thermal Emission Imaging System (THEMIS) images based on physical expres
Authors
Marjorie A. Chan, Jens Ormö, Scott L. Murchie, Chris Okubo, Goro Komatsu, James J. Wray, Patrick E. McGuire, James A. McGovern
Aeolian bedforms, yardangs, and indurated surfaces in the Tharsis Montes as seen by the HiRISE Camera: Evidence for dust aggregates
HiRISE images of Mars with ground sampling down to 25 cm/pixel show that the dust-rich mantle covering the surfaces of the Tharsis Montes is organized into ridges whose form and distribution are consistent with formation by aeolian saltation. Other dusty areas near the volcanoes and elsewhere on the planet exhibit a similar morphology. The material composing these "reticulate" bedforms is constrai
Authors
Nathan T. Bridges, Maria E. Banks, Ross A. Beyer, Frank C. Chuang, Eldar Z. Noe Dobrea, Kenneth E. Herkenhoff, Laszlo P. Keszthelyi, K.E. Fishbaugh, Alfred S. McEwen, Timothy I. Michaels, B.J. Thomson, James J. Wray
Inverted channel deposits on the floor of Miyamoto crater, Mars
Morphological features on the western floor of Miyamoto crater in southwestern Meridiani Planum, Mars, are suggestive of past fluvial activity. Imagery from the High Resolution Imaging Science Experiment (HiRISE) gives a detailed view of raised curvilinear features that appear to represent inverted paleochannel deposits. The inverted terrain appears to be capped with a resistant, dark-toned deposi
Authors
Horton E. Newsom, Nina L. Lanza, Ann M. Ollila, Sandra M. Wiseman, Ted L. Roush, Giuseppe A. Marzo, Livio L. Tornabene, Chris H. Okubo, Mikki M. Osterloo, Victoria E. Hamilton, Larry S. Crumpler
HiRISE observations of gas sublimation-driven activity in Mars' southern polar regions: III. Models of processes involving translucent ice
Enigmatic surface features, known as 'spiders', found at high southern martian latitudes, are probably caused by sublimation-driven erosion under the seasonal carbon dioxide ice cap. The Mars Reconnaissance Orbiter (MRO) High Resolution Imaging Science Experiment (HiRISE) has imaged this terrain in unprecedented details throughout southern spring. It has been postulated [Kieffer, H.H., Titus, T.N.
Authors
Ganna Portyankina, Wojciech J. Markiewicz, Nicolas Thomas, Candice J. Hansen, Moses P. Milazzo
Evolution of earthquake-triggered landslides in the Kashmir Himalaya, northern Pakistan
The influence of the 08 October 2005 Kashmir earthquake and subsequent snow melt and monsoon rainfall on slope stability was evaluated using repeat photography in the Kashmir Himalaya of northern Pakistan. Sixty-eight landslide-affected locations were selected and photographed in November 2005, May/June 2006, June 2007, and August 2007 to evaluate all potential geomorphic changes. Eighty percent o
Authors
G.A. Khattak, L.A. Owen, U. Kamp, E. L. Harp
Exploring the limits of identifying sub-pixel thermal features using ASTER TIR data
Understanding the characteristics of volcanic thermal emissions and how they change with time is important for forecasting and monitoring volcanic activity and potential hazards. Satellite instruments view volcanic thermal features across the globe at various temporal and spatial resolutions. Thermal features that may be a precursor to a major eruption, or indicative of important changes in an on-
Authors
R. Greg Vaughan, Laszlo P. Keszthelyi, Ashley G. Davies, David J. Schneider, Cheryl Jaworowski, Henry Heasler