Skip to main content
U.S. flag

An official website of the United States government

Publications

Filter Total Items: 7412

Surface‐wave Green’s tensors in the near field

We demonstrate the connection between theoretical expressions for the correlation of ambient noise Rayleigh and Love waves and the exact surface‐wave Green’s tensors for a point force. The surface‐wave Green’s tensors are well known in the far‐field limit. On the other hand, the imaginary part of the exact Green’s tensors, including near‐field effects, arises in correlation techniques...
Authors
Matthew M. Haney, Hisashi Nakahara

Modeling the effects of source and path heterogeneity on ground motions of great earthquakes on the Cascadia Subduction Zone Using 3D simulations

We ran finite‐difference earthquake simulations for great subduction zone earthquakes in Cascadia to model the effects of source and path heterogeneity for the purpose of improving strong‐motion predictions. We developed a rupture model for large subduction zone earthquakes based on a k−2 slip spectrum and scale‐dependent rise times by representing the slip distribution as the sum of...
Authors
Andrew Delorey, Arthur Frankel, Pengcheng Liu, William J. Stephenson

1964 Great Alaska Earthquake: a photographic tour of Anchorage, Alaska

On March 27, 1964, at 5:36 p.m., a magnitude 9.2 earthquake, the largest recorded earthquake in U.S. history, struck southcentral Alaska (fig. 1). The Great Alaska Earthquake (also known as the Good Friday Earthquake) occurred at a pivotal time in the history of earth science, and helped lead to the acceptance of plate tectonic theory (Cox, 1973; Brocher and others, 2014). All large...
Authors
Evan E. Thoms, Peter J. Haeussler, Rebecca Anderson, Robert G. McGimsey

Evaluating a slope-stability model for shallow rain-induced landslides using gage and satellite data

Improving prediction of landslide early warning systems requires accurate estimation of the conditions that trigger slope failures. This study tested a slope-stability model for shallow rainfall-induced landslides by utilizing rainfall information from gauge and satellite records. We used the TRIGRS model (Transient Rainfall Infiltration and Grid-based Regional Slope-stability analysis)...
Authors
S. Yatheendradas, D. Kirschbaum, Rex L. Baum, Jonathan W. Godt

Evolution of wear and friction along experimental faults

We investigate the evolution of wear and friction along experimental faults composed of solid rock blocks. This evolution is analyzed through shear experiments along five rock types, and the experiments were conducted in a rotary apparatus at slip velocities of 0.002–0.97 m/s, slip distances from a few millimeters to tens of meters, and normal stress of 0.25–6.9 MPa. The wear and...
Authors
Yeval Boneh, Jefferson C. Chang, David A. Lockner, Zeev Reches

HiRISE observations of Recurring Slope Lineae (RSL) during southern summer on Mars

Recurring Slope Lineae (RSL) are active features on Mars that might require flowing water. Most examples observed through 2011 formed on steep, equator-facing slopes in the southern mid-latitudes. They form and grow during warm seasons and fade and often completely disappear during colder seasons, but recur over multiple Mars years. They are recognizable by their incremental growth...
Authors
Lujendra Ojha, Alfred McEwen, Colin M. Dundas, Shane Byrne, Sarah Mattson, James Wray, Marion Masse, Ethan Schaefer

ChemCam results from the Shaler Outcrop in Gale Crater, Mars

The "Shaler" outcrop in Gale crater is approximately 0.7 m thick and >20 m long, and exhibits multiple well-exposed platy and cross-stratified facies [1] interpreted to be primarily fluvial sandstone deposits. The outcrop is a part of the upper Glenelg member in the Yellowknife Bay (YKB) stratigraphic section [2]. Curiosity first encountered the "Shaler" outcrop on sol 121 of the mission...
Authors
Ryan Bradley Anderson, L. Edgar, J.C. Bridges, A. Williams, J. Williams, A. Ollila, O. Forni, N. Mangold, N. Lanza, V. Sautter, S. Gupta, D. Blaney, B. Clark, G. Clegg, G. Dromart, O. Gasnault, J. Lasue, S. Le Mouélic, Richard Léveillé, E. Lewin, K. Lewis, S. Maurice, Marion Nachon, H. Newsom, D. Vaniman, R. C. Wiens

Determining grain characteristics in the Shaler Outcrop with ChemCam Remote Micro-Imager mosaics

Analysis of grain size distribution from RMI mosaics (Curiosity) are used to better define variations in grain size and facies in the Shaler outcrop.
Authors
A. J. Williams, J. M. Williams, R.B. Anderson, L.A. Edgar, H. Newsom, S. Le Mouélic, M. Minitti, R. Wiens, S. Maurice

Characterizing the primary material sources and dominant erosional processes for post-fire debris-flow initiation in a headwater basin using multi-temporal terrestrial laser scanning data

Wildfire dramatically alters the hydrologic response of a watershed such that even modest rainstorms can produce hazardous debris flows. Relative to shallow landslides, the primary sources of material and dominant erosional processes that contribute to post-fire debris-flow initiation are poorly constrained. Improving our understanding of how and where material is eroded from a watershed...
Authors
Dennis M. Staley, Thad A. Waslewicz, Jason W. Kean

Gravity, magnetic, and radiometric data for Newberry Volcano, Oregon, and vicinity

Newberry Volcano in central Oregon is a 3,100-square-kilometer (1,200-square-mile) shield-shaped composite volcano, occupying a location east of the main north-south trend of the High Cascades volcanoes and forming a transition between the High Lava Plains subprovince of the Basin and Range Province to the east and the Cascade Range to the west. Magnetic, gravity, and radiometric data...
Authors
Jeff Wynn

2009 Volcanic activity in Alaska, Kamchatka, and the Kurile Islands: Summary of events and response of the Alaska Volcano Observatory

The Alaska Volcano Observatory (AVO) responded to eruptions, possible eruptions, volcanic unrest, and reports of unusual activity at or near eight separate volcanic centers in Alaska during 2009. The year was highlighted by the eruption of Redoubt Volcano, one of three active volcanoes on the western side of Cook Inlet and near south-central Alaska's population and commerce centers...
Authors
Robert G. McGimsey, Christina A. Neal, Olga A. Girina, Marina Chibisova, Alexander Rybin
Was this page helpful?