Publications
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Igneous mineralogy at Bradbury Rise: the first ChemCam campaign at Gale crater
Textural and compositional analyses using ChemCam Remote Micro Imager (RMI) and
Laser Induced Breakdown Spectroscopy (LIBS) have been performed on 5 float rocks and
coarse gravels along the first 100 meters of the Curiosity traverse at Bradbury rise.
ChemCam, the first LIBS instrument sent to another planet, offers the opportunity to assess
mineralogic diversity at grain-size scales (∼100μm) and,
Authors
V. Sautter, C. Fabre, O. Forni, M.J. Toplis, A. Cousin, A.M. Ollila, P.-Y. Meslin, S. Maurice, R. C. Wiens, D. Baratoux, N. Mangold, S. Le Mouélic, O. Gasnault, G. Berger, J. Lasue, R.A. Anderson, E. Lewin, M. Schmidt, D. Dyar, B.L. Ehlmann, J. Bridges, B. Clark, P. Pinet
Global surface displacement data for assessing variability of displacement at a point on a fault
This report presents a global dataset of site-specific surface-displacement data on faults. We have compiled estimates of successive displacements attributed to individual earthquakes, mainly paleoearthquakes, at sites where two or more events have been documented, as a basis for analyzing inter-event variability in surface displacement on continental faults.
An earlier version of this composite
Authors
Suzanne Hecker, Robert Sickler, Leah Feigelson, Norman Abrahamson, Will Hassett, Carla Rosa, Ann Sanquini
Three-dimensional ground-motion simulations of earthquakes for the Hanford area, Washington
This report describes the results of ground-motion simulations of earthquakes using three-dimensional (3D) and one-dimensional (1D) crustal models conducted for the probabilistic seismic hazard assessment (PSHA) of the Hanford facility, Washington, under the Senior Seismic Hazard Analysis Committee (SSHAC) guidelines. The first portion of this report demonstrates that the 3D seismic velocity model
Authors
Arthur Frankel, Paul Thorne, Alan Rohay
Response of Global Navigation Satellite System receivers to known shaking between 0.2 and 20 Hertz
Over the past decade, several technological advances have allowed Global Navigation Satellite Systems (GNSS) receivers to have the capability to record displacements at high frequencies, with sampling rates approaching 100 samples per second (sps). In addition, communication and computer hardware and software have allowed various institutions, including the U.S. Geological Survey (USGS), to retrie
Authors
John Langbein, John R. Evans, Fredrick Blume, Ingrid Johanson
Geochemical investigation of the hydrothermal system on Akutan Island, Alaska, July 2012
We have studied the geochemistry of the hot springs on Akutan Island in detail for the first time since the early 1980s. Springs in four discrete groups (A-D) along Hot Springs Creek showed generally higher temperatures and substantially higher Na, Ca, and Cl concentrations than previously reported, and total hot-spring discharge has also increased markedly. The springs now account for a heat outp
Authors
D. Bergfeld, Jennifer L. Lewicki, William C. Evans, Andrew G. Hunt, Kinga Revesz, Mark Huebner
Recurring slope lineae in equatorial regions of Mars
The presence of liquid water is a requirement of habitability on a planet. Possible indicators of liquid surface water on Mars include intermittent flow-like features observed on sloping terrains. These recurring slope lineae are narrow, dark markings on steep slopes that appear and incrementally lengthen during warm seasons on low-albedo surfaces. The lineae fade in cooler seasons and recur over
Authors
Alfred S. McEwen, Colin M. Dundas, Sarah S. Mattson, Anthony D. Toigo, Lujendra Ojha, James J. Wray, Matthew Chojnacki, Shane Byrne, Scott L. Murchie, Nicolas Thomas
What do data used to develop ground-motion prediction equations tell us about motions near faults?
A large database of ground motions from shallow earthquakes occurring in active tectonic regions around the world, recently developed in the Pacific Earthquake Engineering Center’s NGA-West2 project, has been used to investigate what such a database can say about the properties and processes of crustal fault zones. There are a relatively small number of near-rupture records, implying that few reco
Authors
David M. Boore
“Our vanishing glaciers”: One hundred years of glacier retreat in Three Sisters Area, Oregon Cascade Range
In August 1910, thirty-nine members of the Mazamas Mountaineering Club ascended the peaks of the Three Sisters in central Oregon. While climbing, geologist Ira A. Williams photographed the surrounding scenery, including images of Collier Glacier. One hundred years later, U.S. Geological Survey research hydrologist Jim E. O’Connor matched those documented photographs with present day images — the r
Authors
James E. O'Connor
Debris flows: Behavior and hazard assessment
Debris flows are water-laden masses of soil and fragmented rock that rush down mountainsides, funnel into stream channels, entrain objects in their paths, and form lobate deposits when they spill onto valley floors. Because they have volumetric sediment concentrations that exceed 40 percent, maximum speeds that surpass 10 m/s, and sizes that can range up to ~109 m3, debris flows can denude slopes,
Authors
Richard M. Iverson
Interrelations among the soil-water retention, hydraulic conductivity, and suction-stress characteristic curves
The three fundamental constitutive relations that describe fluid flow, strength, and deformation behavior of variably saturated soils are the soil-water retention curve (SWRC), hydraulic conductivity function (HCF), and suction-stress characteristic curve (SSCC). Until recently, the interrelations among the SWRC, HCF, and SSCC have not been well established. This work sought experimental confirmat
Authors
Ning Lu, Murat Kaya, Jonathan W. Godt
Volatile and organic compositions of sedimentary rocks in Yellowknife Bay, Gale crater, Mars
H2O, CO2, SO2, O2, H2, H2S, HCl, chlorinated hydrocarbons, NO, and other trace gases were evolved during pyrolysis of two mudstone samples acquired by the Curiosity rover at Yellowknife Bay within Gale crater, Mars. H2O/OH-bearing phases included 2:1 phyllosilicate(s), bassanite, akaganeite, and amorphous materials. Thermal decomposition of carbonates and combustion of organic materials are candid
Authors
D. W. Ming, P.D. Archer, D.P. Glavin, J.L. Eigenbrode, H.B. Franz, B. Sutter, A.E. Brunner, J. C. Stern, C. Freissinet, A.C. McAdam, P.R. Mahaffy, M. Cabane, P. Coll, J.L. Campbell, S.K. Atreya, P.B. Niles, J.F. Bell, D.L. Bish, W.B. Brinckerhoff, A. Buch, P.G. Conrad, D.J. Des Marais, B.L. Ehlmann, A.G. Fairén, K. Farley, G.J. Flesch, P. Francois, Ralf Gellert, J. A. Grant, J.P. Grotzinger, S. Gupta, Kenneth E. Herkenhoff, J.A. Hurowitz, L.A. Leshin, K.W. Lewis, S. M. McLennan, Karl E. Miller, J. Moersch, R.V. Morris, R. Navarro- González, A.A. Pavlov, G.M. Perrett, I. Pradler, S. W. Squyres, Roger E. Summons, A. Steele, E.M. Stolper, D.Y. Sumner, C. Szopa, S. Teinturier, M.G. Trainer, A.H. Treiman, D. T. Vaniman, A.R. Vasavada, C.R. Webster, J.J. Wray, R.A. Yingst
Trace element geochemistry (Li, Ba, Sr, and Rb) using Curiosity's ChemCam: early results for Gale crater from Bradbury Landing Site to Rocknest
The ChemCam instrument package on the Mars rover, Curiosity, provides new capabilities to probe the abundances of certain trace elements in the rocks and soils on Mars using the laser-induced breakdown spectroscopy technique. We focus on detecting and quantifying Li, Ba, Rb, and Sr in targets analyzed during the first 100 sols, from Bradbury Landing Site to Rocknest. Univariate peak area models an
Authors
Ann M. Ollila, Horton E. Newsom, Benton Clark, Roger C. Wiens, Agnès Cousin, Jen G. Blank, Nicolas Mangold, Violaine Sautter, Sylvestre Maurice, Samuel M. Clegg, Olivier Gasnault, Olivier Forni, Robert Tokar, Eric Lewin, M. Darby Dyar, Jeremie Lasue, Ryan Anderson, Scott M. McLennan, John Bridges, Dave Vaniman, Nina Lanza, Cecile Fabre, Noureddine Melikechi, Glynis M. Perett, John L. Campbell, Penelope L. King, Bruce Barraclough, Dorothea Delapp, Stephen Johnstone, Pierre-Yves Meslin, Anya Rosen-Gooding, Josh Williams