Publications
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Widespread groundwater-level offsets caused by the Mw 5.8 Mineral, Virginia, earthquake of 23 August 2011
Groundwater levels were offset in bedrock observation wells, measured by the U.S. Geological Survey or others, as far as 553 km from the Mw 5.8 Mineral, Virginia (USA), earthquake on 23 August 2011. Water levels dropped as much as 0.47 m in 34 wells and rose as much as 0.15 m in 12 others. In some wells, which are as much as 213 m deep, the water levels recovered from these deviations in hours to
Authors
Evelyn A. Roeloffs, David L. Nelms, Rodney A. Sheets
Landslides and megathrust splay faults captured by the late Holocene sediment record of eastern Prince William Sound, Alaska
We present new marine seismic‐reflection profiles and bathymetric maps to characterize Holocene depositional patterns, submarine landslides, and active faults beneath eastern and central Prince William Sound (PWS), Alaska, which is the eastern rupture patch of the 1964 Mw 9.2 earthquake. We show evidence that submarine landslides, many of which are likely earthquake triggered, repeatedly released
Authors
S.P. Finn, Lee M. Liberty, Peter J. Haeussler, Thomas L. Pratt
Stress orientations in subduction zones and the strength of subduction megathrust faults
Subduction zone megathrust faults produce most of the world’s largest earthquakes. Although the physical properties of these faults are difficult to observe directly, their frictional strength can be estimated indirectly by constraining the orientations of the stresses that act on them. A global investigation of stress orientations in subduction zones finds that the maximum compressive stress axis
Authors
Jeanne L. Hardebeck
Slip pulse and resonance of Kathmandu basin during the 2015 Mw 7.8 Gorkha earthquake, Nepal imaged with space geodesy
Detailed geodetic imaging of earthquake rupture enhances our understanding of earthquake physics and induced ground shaking. The April 25, 2015 Mw 7.8 Gorkha, Nepal earthquake is the first example of a large continental megathrust rupture beneath a high-rate (5 Hz) GPS network. We use GPS and InSAR data to model the earthquake rupture as a slip pulse of ~20 km width, ~6 s duration, and with peak s
Authors
John Galetzka, D. Melgar, J.F. Genrich, J. Geng, S. Owen, E. O. Lindsey, X. Xu, Y. Bock, J.-P. Avouac, L. B. Adhikari, B. N. Upreti, B. Pratt-Sitaula, T. N. Bhattarai, B. P. Sitaula, A. Moore, Kenneth W. Hudnut, W. Szeliga, J. Normandeau, M. Fend, M Flouzat, L. Bollinger, P. Shrestha, B. Koirala, U. Gautam, M. Bhatterai, R. Gupta, T. Kandel, C. Timsina, S.N. Sapkota, S. Rajaure, N. Maharjan
Seismicity of the Earth 1900‒2013 Mediterranean Sea and vicinity
The Mediterranean region is seismically active due to the convergence of the Africa Plate with the Eurasia plate. Present day Africa-Eurasia motion ranges from ~4 millimeters per year (mm/yr) in a northwest-southeast direction in the western Mediterranean to ~10 mm/yr (north-south) in the eastern Mediterranean. The Africa-Eurasia plate boundary is complex, and includes extensional and translationa
Authors
Matthew W. Herman, Gavin P. Hayes, Gregory M. Smoczyk, Rebecca Turner, Bethan Turner, Jennifer Jenkins, Sian Davies, Amy Parker, Allison Sinclair, Harley M. Benz, Kevin P. Furlong, Antonio Villaseñor
Ground motion simulation for the 23 August 2011, Mineral, Virginia earthquake using physics-based and stochastic broadband methods
Three broadband simulation methods are used to generate synthetic ground motions for the 2011 Mineral, Virginia, earthquake and compare with observed motions. The methods include a physics‐based model by Hartzell et al. (1999, 2005), a stochastic source‐based model by Boore (2009), and a stochastic site‐based model by Rezaeian and Der Kiureghian (2010, 2012). The ground‐motion dataset consists of
Authors
Xiaodan Sun, Stephen H. Hartzell, Sanaz Rezaeian
Changes in seismic velocity during the first 14 months of the 2004–2008 eruption of Mount St. Helens, Washington
Mount St. Helens began erupting in late 2004 following an 18 year quiescence. Swarms of repeating earthquakes accompanied the extrusion of a mostly solid dacite dome over the next 4 years. In some cases the waveforms from these earthquakes evolved slowly, likely reflecting changes in the properties of the volcano that affect seismic wave propagation. We use coda-wave interferometry to quantify sma
Authors
A.J. Hotovec-Ellis, J.E. Vidale, Joan S. Gomberg, Weston A. Thelen, Seth C. Moran
Photomosaics and event evidence from the Frazier Mountain paleoseismic site, trench 1, cuts 5–24, San Andreas Fault Zone, southern California (2010–2012)
The Frazier Mountain paleoseismic site is located within the northern Big Bend of the southern San Andreas Fault (lat 34.8122° N., lon 118.9034° W.), in a small structural basin formed by the fault (fig. 1). The site has been the focus of over a decade of paleoseismic study due to high stratigraphic resolution and abundant dateable material. Trench 1 (T1) was initially excavated as a 50-m long, fa
Authors
Katherine M. Scharer, Tom E. Fumal, Ray J. Weldon, Ashley R. Streig
Upgrade of the New China Digital Seismograph Network
No abstract available.
Authors
D. Anderson, J. Anderson, D. Ford, Lind S. Gee, G. Gyure, Charles R. Hutt, E. Kromer, B. Marshall, K. Persefield, Adam T. Ringler, M. Sharratt, Tyler Storm, David C. Wilson, D. Yang, Z. Zheng
Estimating annualized earthquake losses for the conterminous United States
We make use of the most recent National Seismic Hazard Maps (the years 2008 and 2014 cycles), updated census data on population, and economic exposure estimates of general building stock to quantify annualized earthquake loss (AEL) for the conterminous United States. The AEL analyses were performed using the Federal Emergency Management Agency's (FEMA) Hazus software, which facilitated a systemati
Authors
Kishor S. Jaiswal, Douglas Bausch, Rui Chen, Jawhar Bouabid, Hope Seligson
What lies deep in the mantle below?
For decades, scientists have probed Earth's remote mantle by analyzing how seismic waves of distant earthquakes pass through it. But we are still challenged by the technique's limitations.
Authors
Gillian R. Foulger, Giuliano F. Panza, Irina M. Artemieva, Ian D. Bastow, Fabio Cammarano, Carlo Doglioni, John R. Evans, Warren B. Hamilton, Bruce R. Julian, Michele Lustrino, Hans Thybo, Tatiana Yanovskaya
On- and off-fault deformation associated with the September 2013 Mw7.7 Balochistan earthquake: Implications for geologic slip rate measurements
The 24 September 2013 Mw7.7 Balochistan, Pakistan earthquake ruptured a ~ 200 km-long stretch of the Hoshab fault in southern Pakistan and produced the second-largest lateral surface displacement observed for a continental strike-slip earthquake. We remotely measured surface deformation associated with this event using high-resolution (0.5 m) pre- and post-event satellite optical imagery. We docum
Authors
Ryan D. Gold, Nadine G. Reitman, Richard W. Briggs, William D. Barnhart, Gavin P. Hayes, Earl M. Wilson