Publications
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The California Earthquake Advisory Plan: A history The California Earthquake Advisory Plan: A history
Since 1985, the California Office of Emergency Services (Cal OES) has issued advisory statements to local jurisdictions and the public following seismic activity that scientists on the California Earthquake Prediction Evaluation Council view as indicating elevated probability of a larger earthquake in the same area during the next several days. These advisory statements are motivated by
Authors
Evelyn A. Roeloffs, James D. Goltz
Diagenetic silica enrichment and late-stage groundwater activity in Gale crater, Mars Diagenetic silica enrichment and late-stage groundwater activity in Gale crater, Mars
Diagenetic silica enrichment in fracture-associated halos that crosscut lacustrine and unconformably overlying aeolian sedimentary bedrock is observed on the lower north slope of Aeolis Mons in Gale crater, Mars. The diagenetic silica enrichment is colocated with detrital silica enrichment observed in the lacustrine bedrock yet extends into a considerably younger, unconformably draping...
Authors
Jens Frydenvang, Patrick J. Gasda, Joel A. Hurowitz, John P. Grotzinger, Roger C. Wiens, Horton E. Newsom, Ken S. Edgett, Jessica Watkins, John C. Bridges, Sylvestre Maurice, Martin R. Fisk, Jeffrey R. Johnson, William Rapin, Nathan Stein, Sam M. Clegg, S. P. Schwenzer, C. Bedford, P. Edwards, Nicolas Mangold, Agnes Cousin, Ryan B. Anderson, Valerie Payre, David Vaniman, David Blake, Nina L. Lanza, Sanjeev Gupta, Jason K. Van Beek, Violaine Sautter, Pierre-Yves Meslin, Melissa Rice, Ralf Milliken, Ralf Gellert, Lucy Thompson, Ben C. Clark, Dawn Y. Sumner, Abigail A. Fraeman, Kjartan M Kinch, Morten B. Madsen, Igor Mitofranov, Insoo Jun, Fred J. Calef, Ashwin R. Vasavada
Low stress drops observed for aftershocks of the 2011 Mw 5.7 Prague, Oklahoma, earthquake Low stress drops observed for aftershocks of the 2011 Mw 5.7 Prague, Oklahoma, earthquake
In November 2011, three Mw ≥ 4.8 earthquakes and thousands of aftershocks occurred along the structurally complex Wilzetta fault system near Prague, Oklahoma. Previous studies suggest that wastewater injection induced a Mw 4.8 foreshock, which subsequently triggered a Mw 5.7 mainshock. We examine source properties of aftershocks with a standard Brune-type spectral model and jointly solve...
Authors
Danielle F. Sumy, Corrie J. Neighbors, Elizabeth S. Cochran, Katie M. Keranen
Precipitation thresholds for landslide occurrence near Seattle, Mukilteo, and Everett, Washington Precipitation thresholds for landslide occurrence near Seattle, Mukilteo, and Everett, Washington
Shallow landslides along coastal bluffs frequently occur in the railway corridor between Seattle and Everett, Washington. These slides disrupt passenger rail service, both because of required track maintenance and because the railroad owner, Burlington Northern Santa Fe Railway, does not allow passenger travel for 48 hours after a disruptive landslide. Sound Transit, which operates...
Authors
Caroline R. Scheevel, Rex L. Baum, Benjamin B. Mirus, Joel B. Smith
Time-causal decomposition of geomagnetic time series into secular variation, solar quiet, and disturbance signals Time-causal decomposition of geomagnetic time series into secular variation, solar quiet, and disturbance signals
A theoretical basis and prototype numerical algorithm are provided that decompose regular time series of geomagnetic observations into three components: secular variation; solar quiet, and disturbance. Respectively, these three components correspond roughly to slow changes in the Earth’s internal magnetic field, periodic daily variations caused by quasi-stationary (with respect to the...
Authors
E. Joshua Rigler
Effect of hydraulic hysteresis on the stability of infinite slopes under steady infiltration Effect of hydraulic hysteresis on the stability of infinite slopes under steady infiltration
Hydraulic hysteresis, including capillary soil water retention (SWR), air entrapment SWR, and hydraulic conductivity, is a common phenomenon in unsaturated soils. However, the influence of hydraulic hysteresis on suction stress, and subsequently slope stability, is generally ignored. This paper examines the influence of each of these three types of hysteresis on slope stability using an...
Authors
Pan Chen, Benjamin B. Mirus, Ning Lu, Jonathan W. Godt
The HayWired earthquake scenario—Earthquake hazards The HayWired earthquake scenario—Earthquake hazards
The HayWired scenario is a hypothetical earthquake sequence that is being used to better understand hazards for the San Francisco Bay region during and after an earthquake of magnitude 7 on the Hayward Fault. The 2014 Working Group on California Earthquake Probabilities calculated that there is a 33-percent likelihood of a large (magnitude 6.7 or greater) earthquake occurring on the...
Feasibility study for the quantitative assessment of mineral resources in asteroids Feasibility study for the quantitative assessment of mineral resources in asteroids
This study was undertaken to determine if the U.S. Geological Survey’s process for conducting mineral resource assessments on Earth can be applied to asteroids. Successful completion of the assessment, using water and iron resources to test the workflow, has resulted in identification of the minimal adjustments required to conduct full resource assessments beyond Earth. We also identify...
Authors
Laszlo P. Keszthelyi, Justin Hagerty, Amanda Bowers, Karl J. Ellefsen, Trude King, Ian Ridley, David Trilling, Nicholas Moskovitz, Will Grundy
The California Seafloor and Coastal Mapping Program – Providing science and geospatial data for California's State Waters The California Seafloor and Coastal Mapping Program – Providing science and geospatial data for California's State Waters
The California Seafloor and Coastal Mapping Program (CSCMP) is a collaborative effort to develop comprehensive bathymetric, geologic, and habitat maps and data for California's State Waters. CSCMP began in 2007 when the California Ocean Protection Council (OPC) and the National Oceanic and Atmospheric Administration (NOAA) allocated funding for high-resolution bathymetric mapping...
Authors
Samuel Y. Johnson, Guy R. Cochrane, Nadine E. Golden, Peter Dartnell, Stephen Hartwell, Susan A. Cochran, Janet Watt
Long-term afterslip of the M6.0, 2004 Parkfield, California, earthquake—Implications for forecasting amount and duration of afterslip on other major creeping faults Long-term afterslip of the M6.0, 2004 Parkfield, California, earthquake—Implications for forecasting amount and duration of afterslip on other major creeping faults
We present the longest record of surface afterslip on a continental strike‐slip fault for the 2004 M 6.0 Parkfield, California, earthquake, from which we can derive critical information about the duration and predictability of afterslip relevant to urban displacement hazard applications. Surface slip associated with this event occurred entirely postseismically along the interseismically...
Authors
James J. Lienkaemper, Forrest S. McFarland
Shallow-depth location and geometry of the Piedmont Reverse splay of the Hayward Fault, Oakland, California Shallow-depth location and geometry of the Piedmont Reverse splay of the Hayward Fault, Oakland, California
The Piedmont Thrust Fault, herein referred to as the Piedmont Reverse Fault (PRF), is a splay of the Hayward Fault that trends through a highly populated area of the City of Oakland, California (fig. 1A). Although the PRF is unlikely to generate a large-magnitude earthquake, slip on the PRF or high-amplitude seismic energy traveling along the PRF may cause considerable damage during a...
Authors
Rufus D. Catchings, Mark R. Goldman, David Trench, Michael Buga, Joanne H. Chan, Coyn J. Criley, Luther M. Strayer
Capturing spatiotemporal variation in wildfires for improving postwildfire debris-flow hazard assessments Capturing spatiotemporal variation in wildfires for improving postwildfire debris-flow hazard assessments
Wildfires can increase the frequency and magnitude of catastrophic debris flows. Integrated, proactive natural hazard assessment would therefore characterize landscapes based on the potential for the occurrence and interactions of wildfires and postwildfire debris flows. This chapter presents a new modeling effort that can quantify the variability surrounding a key input to postwildfire...
Authors
Jessica R. Haas, Matthew P. Thompson, Anne C. Tillery, Joe H. Scott