Publications
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Wastewater disposal and the earthquake sequences during 2016 near Fairview, Pawnee, and Cushing, Oklahoma Wastewater disposal and the earthquake sequences during 2016 near Fairview, Pawnee, and Cushing, Oklahoma
Each of the three earthquake sequences in Oklahoma in 2016—Fairview, Pawnee, and Cushing—appears to have been induced by high-volume wastewater disposal within 10 km. The Fairview M5.1 main shock was part of a 2 year sequence of more than 150 events of M3, or greater; the main shock accounted for about half of the total moment. The foreshocks and aftershocks of the M5.8 Pawnee earthquake...
Authors
Arthur F. McGarr, Andrew J. Barbour
The interior structure of Ceres as revealed by surface topography The interior structure of Ceres as revealed by surface topography
Ceres, the largest body in the asteroid belt (940 km diameter), provides a unique opportunity to study the interior structure of a volatile-rich dwarf planet. Variations in a planetary body's subsurface rheology and density affect the rate of topographic relaxation. Preferential attenuation of long wavelength topography (≥150 km) on Ceres suggests that the viscosity of its crust...
Authors
Roger R. Fu, Anton Ermakov, Simone Marchi, Julie C. Castillo-Rogez, Carol A. Raymond, Bradford Hager, Maria Zuber, Scott D. King, Michael T. Bland, Maria Cristina De Sanctis, Frank Preusker, Ryan S. Park, Christopher T. Russell
Evaluating spatial and temporal relationships between an earthquake cluster near Entiat, central Washington, and the large December 1872 Entiat earthquake Evaluating spatial and temporal relationships between an earthquake cluster near Entiat, central Washington, and the large December 1872 Entiat earthquake
We investigate spatial and temporal relations between an ongoing and prolific seismicity cluster in central Washington, near Entiat, and the 14 December 1872 Entiat earthquake, the largest historic crustal earthquake in Washington. A fault scarp produced by the 1872 earthquake lies within the Entiat cluster; the locations and areas of both the cluster and the estimated 1872 rupture...
Authors
Thomas M. Brocher, Richard J. Blakely, Brian L. Sherrod
Performance of Irikura recipe rupture model generator in earthquake ground motion simulations with Graves and Pitarka hybrid approach Performance of Irikura recipe rupture model generator in earthquake ground motion simulations with Graves and Pitarka hybrid approach
We analyzed the performance of the Irikura and Miyake (Pure and Applied Geophysics 168(2011):85–104, 2011) (IM2011) asperity-based kinematic rupture model generator, as implemented in the hybrid broadband ground motion simulation methodology of Graves and Pitarka (Bulletin of the Seismological Society of America 100(5A):2095–2123, 2010), for simulating ground motion from crustal...
Authors
Arben Pitarka, Robert Graves, Kojiro Irikura, Hiroe Miyake, Arthur Rodgers
Forecasting the (un)productivity of the 2014 M 6.0 South Napa aftershock sequence Forecasting the (un)productivity of the 2014 M 6.0 South Napa aftershock sequence
The 24 August 2014 Mw 6.0 South Napa mainshock produced fewer aftershocks than expected for a California earthquake of its magnitude. In the first 4.5 days, only 59 M≥1.8 aftershocks occurred, the largest of which was an M 3.9 that happened a little over two days after the mainshock. We investigate the aftershock productivity of the South Napa sequence and compare it with other M≥5.5...
Authors
Andrea L. Llenos, Andrew J. Michael
Evaluating a kinematic method for generating broadband ground motions for great subduction zone earthquakes: Application to the 2003 Mw 8.3 Tokachi‐Oki earthquake Evaluating a kinematic method for generating broadband ground motions for great subduction zone earthquakes: Application to the 2003 Mw 8.3 Tokachi‐Oki earthquake
We compare broadband synthetic seismograms with recordings of the 2003 MwMw 8.3 Tokachi‐Oki earthquake to evaluate a compound rupture model, in which slip on the fault consists of multiple high‐stress‐drop asperities superimposed on a background slip distribution with longer rise times. Low‐frequency synthetics (>1 Hz>1 Hz) stochastic synthetics using a matched filter at 1 Hz. We show...
Authors
Erin A. Wirth, Arthur D. Frankel, John E. Vidale
Holocene earthquakes of magnitude 7 during westward escape of the Olympic Mountains, Washington Holocene earthquakes of magnitude 7 during westward escape of the Olympic Mountains, Washington
The Lake Creek–Boundary Creek fault, previously mapped in Miocene bedrock as an oblique thrust on the north flank of the Olympic Mountains, poses a significant earthquake hazard. Mapping using 2015 light detection and ranging (lidar) confirms 2004 lidar mapping of postglacial (≥14 km along a splay fault, the Sadie Creek fault, west of Lake Crescent. Scarp morphology suggests repeated...
Authors
Alan R. Nelson, Stephen Personius, Ray E. Wells, Elizabeth R. Schermer, Lee-Ann Bradley, Jason Buck, Nadine G. Reitman
Refining fault slip rates using multiple displaced terrace risers-An example from the Honey Lake fault, NE California, USA Refining fault slip rates using multiple displaced terrace risers-An example from the Honey Lake fault, NE California, USA
Faulted terrace risers are semi-planar features commonly used to constrain Quaternary slip rates along strike-slip faults. These landforms are difficult to date directly and therefore their ages are commonly bracketed by age estimates of the adjacent upper and lower terrace surfaces. However, substantial differences in the ages of the upper and lower terrace surfaces (a factor of 2.4...
Authors
Ryan D. Gold, Richard W. Briggs, Anthony J. Crone, Christopher B. DuRoss
Pitted terrains on (1) Ceres and implications for shallow subsurface volatile distribution Pitted terrains on (1) Ceres and implications for shallow subsurface volatile distribution
Prior to the arrival of the Dawn spacecraft at Ceres, the dwarf planet was anticipated to be ice-rich. Searches for morphological features related to ice have been ongoing during Dawn's mission at Ceres. Here we report the identification of pitted terrains associated with fresh Cerean impact craters. The Cerean pitted terrains exhibit strong morphological similarities to pitted materials
Authors
H.G. Sizemore, Thomas Platz, Norbert Schorghofer, Thomas Prettyman, Maria Christina De Sanctis, David A. Crown, Nico Schmedemann, Andeas Nessemann, Thomas Kneissl, Simone Marchi, Paul M. Schenk, Michael T. Bland, B.E. Schmidt, Kynan H.G. Hughson, F. Tosi, F Zambon, S.C. Mest, R.A. Yingst, D.A. Williams, C.T. Russell, C.A. Raymond
Results of hydrologic monitoring of a landslide-prone hillslope in Portland’s West Hills, Oregon, 2006–2017 Results of hydrologic monitoring of a landslide-prone hillslope in Portland’s West Hills, Oregon, 2006–2017
The West Hills of Portland, in the southern Tualatin Mountains, trend northwest along the west side of Portland, Oregon. These silt-mantled mountains receive significant wet-season precipitation and are prone to sliding during wet conditions, occasionally resulting in property damage or casualties. In an effort to develop a baseline for interpretive analysis of the groundwater response...
Authors
Joel B. Smith, Jonathan W. Godt, Rex L. Baum, Jeffrey A. Coe, William L. Ellis, Eric S. Jones, Scott F. Burns
Hydrologic impacts of landslide disturbances: Implications for remobilization and hazard persistence Hydrologic impacts of landslide disturbances: Implications for remobilization and hazard persistence
Landslides typically alter hillslope topography, but may also change the hydrologic connectivity and subsurface water-storage dynamics. In settings where mobile materials are not completely evacuated from steep slopes, influences of landslide disturbances on hillslope hydrology and susceptibility to subsequent failures remain poorly characterized. Since landslides often recur at the site...
Authors
Benjamin B. Mirus, Joel B. Smith, Rex L. Baum
Selection of the InSight landing site Selection of the InSight landing site
The selection of the Discovery Program InSight landing site took over four years from initial identification of possible areas that met engineering constraints, to downselection via targeted data from orbiters (especially Mars Reconnaissance Orbiter (MRO) Context Camera (CTX) and High-Resolution Imaging Science Experiment (HiRISE) images), to selection and certification via sophisticated...
Authors
M. Golombek, D. Kipp, N. Warner, Ingrid J. Daubar, Robin L. Fergason, Randolph L. Kirk, R. Beyer, A. Huertas, Sylvain Piqueux, N.E. Putzig, B.A. Campbell, G. A. Morgan, C. Charalambous, W. T. Pike, K. Gwinner, F. Calef, D. Kass, M. A. Mischna, J. Ashley, C. Bloom, N. Wigton, T. Hare, C. Schwartz, H. Gengl, L. Redmond, M. Trautman, J. Sweeney, C. Grima, I. B. Smith, E. Sklyanskiy, M. Lisano, J. Benardini, S.E. Smrekar, P. Lognonne, W. B. Banerdt