Publications
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Spirit Mars Rover Mission: Overview and selected results from the northern Home Plate Winter Haven to the side of Scamander crater
This paper summarizes Spirit Rover operations in the Columbia Hills, Gusev crater, from sol 1410 (start of the third winter campaign) to sol 2169 (when extrication attempts from Troy stopped to winterize the vehicle) and provides an overview of key scientific results. The third winter campaign took advantage of parking on the northern slope of Home Plate to tilt the vehicle to track the sun and th
Authors
R. E. Arvidson, J.F. Bell, P. Bellutta, N.A. Cabrol, J.G. Catalano, J. Cohen, L.S. Crumpler, D. J. Des Marais, T.A. Estlin, W.H. Farrand, R. Gellert, J. A. Grant, Rebecca N Greenberger, E.A. Guinness, Kenneth E. Herkenhoff, J.A. Herman, K.D. Iagnemma, J. R. Johnson, G. Klingelhoefer, K.A. Lichtenberg, S.A. Maxwell, D. W. Ming, R.V. Morris, M.S. Rice, S. W. Ruff, A. Shaw, Kirsten L. Siebach, Paulo A. de Souza, A.W. Stroupe, S. W. Squyres, R.J. Sullivan, K.P. Talley, J.A. Townsend, A. Wang, J.R. Wright, A. S. Yen
Mineralogy and chemistry of cobbles at Meridiani Planum, Mars, investigated by the Mars Exploration Rover Opportunity
Numerous loose rocks with dimensions of a few centimeters to tens of centimeters and with no obvious physical relationship to outcrop rocks have been observed along the traverse of the Mars Exploration Rover Opportunity. To date, about a dozen of these rocks have been analyzed with Opportunity's contact instruments, providing information about elemental chemistry (Alpha Particle X‐ray Spectrometer
Authors
I. Fleischer, J. Brückner, C. Schröder, W. Farrand, E. Tréguier, R.V. Morris, G. Klingelhoefer, Kenneth E. Herkenhoff, David W. Mittlefehldt, J. Ashley, M. Golombek, J. R. Johnson, B. Jolliff, Steve W. Squyres, C. Weitz, R. Gellert, Paulo A. de Souza, B. A. Cohen
Seismicity of the Earth 1900-2010, Aleutian arc and vicinity
This map shows details of the Aleutian arc not visible in an earlier publication. The Aleutian arc extends about 3,000 km from the Gulf of Alaska to the Kamchatka Peninsula. It marks the region where the Pacific plate subducts into the mantle beneath the North America plate. This subduction is responsible for the generation of the Aleutian Islands and the deep offshore Aleutian Trench. Relative to
Authors
Harley M. Benz, Matthew Herman, Arthur C. Tarr, Gavin P. Hayes, Kevin P. Furlong, Antonio Villaseñor, Richard L. Dart, Susan Rhea
A comparison of Martian north and south polar cold spots and the long‐term effects of the 2001 global dust storm
In the 1970s, Viking and Mariner observed areas in the polar regions of Mars with winter brightness temperatures below the expected kinetic temperatures for CO2 ice sublimation. These areas have since been termed “cold spots” and have been identified as surface deposits of CO2 atmospheric condensates and, occasionally, active CO2 storms. Three Mars years of data from the Mars Global Surveyor Therm
Authors
C. Cornwall, Timothy N. Titus
Volcano collapse promoted by progressive strength reduction: New data from Mount St. Helens
Rock shear strength plays a fundamental role in volcano flank collapse, yet pertinent data from modern collapse surfaces are rare. Using samples collected from the inferred failure surface of the massive 1980 collapse of Mount St. Helens (MSH), we determined rock shear strength via laboratory tests designed to mimic conditions in the pre-collapse edifice. We observed that the 1980 failure shear su
Authors
Mark E. Reid, Terry E.C. Keith, Robert E. Kayen, Neal R. Iverson, Richard M. Iverson, Dianne Brien
Proceedings of the 25th Himalaya-Karakoram-Tibet Workshop
For a quarter of a century the Himalayan-Karakoram-Tibet (HKT) Workshop has provided scientists studying the India-Asia collision system a wonderful opportunity for workshop-style discussion with colleagues working in this region. In 2010, HKT returns to North America for the first time since 1996. The 25th international workshop is held from June 7 to10 at San Francisco State University, Californ
Authors
Mary L. Leech, Simon L. Klemperer, Walter D. Mooney
Channel change and bed-material transport in the Lower Chetco River, Oregon
The lower Chetco River is a wandering gravel-bed river flanked by abundant and large gravel bars formed of coarse bed-material sediment. Since the early twentieth century, the large gravel bars have been a source of commercial aggregate for which ongoing permitting and aquatic habitat concerns have motivated this assessment of historical channel change and sediment transport rates. Analysis of his
Authors
J. Rose Wallick, Scott W. Anderson, Charles Cannon, Jim E. O'Connor
Global geological mapping of Ganymede
We have compiled a global geological map of Ganymede that represents the most recent understanding of the satellite based on Galileo mission results. This contribution builds on important previous accomplishments in the study of Ganymede utilizing Voyager data and incorporates the many new discoveries that were brought about by examination of Galileo data. We discuss the material properties of geo
Authors
G. Wesley Patterson, Geoffrey C. Collins, James W. Head, Robert T. Pappalardo, Louise M. Prockter, Baerbel K. Lucchitta, Jonathan P. Kay
Locations and magnitudes of historical earthquakes in the Sierra of Ecuador (1587–1996)
The whole territory of Ecuador is exposed to seismic hazard. Great earthquakes can occur in the subduction zone (e.g. Esmeraldas, 1906, Mw8.8), whereas lower magnitude but shallower and potentially more destructive earthquakes can occur in the highlands. This study focuses on the historical crustal earthquakes of the Andean Cordillera. Several large cities are located in the Interandean Valley, am
Authors
Celine Beauval, Hugo Yepes, William H. Bakun, Jose Egred, Alexandra Alvarado, Juan-Carlos Singaucho
Periodic, chaotic, and doubled earthquake recurrence intervals on the deep San Andreas Fault
Earthquake recurrence histories may provide clues to the timing of future events, but long intervals between large events obscure full recurrence variability. In contrast, small earthquakes occur frequently, and recurrence intervals are quantifiable on a much shorter time scale. In this work, I examine an 8.5-year sequence of more than 900 recurring low-frequency earthquake bursts composing tremor
Authors
David R. Shelly
The construction of Chasma Boreale on Mars
The polar layered deposits of Mars contain the planet’s largest known reservoir of water ice1,2 and the prospect of revealing a detailed Martian palaeoclimate record3,4, but the mechanisms responsible for the formation of the dominant features of the north polar layered deposits (NPLD) are unclear, despite decades of debate. Stratigraphic analyses of the exposed portions of Chasma Boreale—a large
Authors
J.W. Holt, Kathryn E. Fishbaugh, S. Byrne, S. Christian, Kenneth L. Tanaka, P.S. Russell, Kenneth E. Herkenhoff, A. Safaeinili, Nathaniel E. Putzig, R.J. Phillips
A magnitude 7.1 earthquake in the Tacoma Fault Zone— A plausible scenario for the southern Puget Sound region, Washington
The U.S. Geological Survey and cooperating scientists have recently assessed the effects of a magnitude 7.1 earthquake on the Tacoma Fault Zone in Pierce County, Washington. A quake of comparable magnitude struck the southern Puget Sound region about 1,100 years ago, and similar earthquakes are almost certain to occur in the future. The region is now home to hundreds of thousands of people, who wo
Authors
Joan Gomberg, Brian Sherrod, Craig Weaver, Art Frankel