Publications
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Quantifying uncertainty in cumulative surface slip along the Cucamonga Fault, a crustal thrust fault in southern California Quantifying uncertainty in cumulative surface slip along the Cucamonga Fault, a crustal thrust fault in southern California
Studies of historic earthquake ground surface ruptures show that displacements along strike are spatially variable. As a result, latest Quaternary slip rates developed from a spatially restricted set of cumulative displacement measurements may not accurately represent fault velocity. Here we examine the uncertainties associated with slip on the Cucamonga Fault, which is part of a network...
Authors
Devin McPhillips, Katherine M. Scharer
Additional period and site class maps for the 2014 National Seismic Hazard Model for the conterminous United States Additional period and site class maps for the 2014 National Seismic Hazard Model for the conterminous United States
The 2014 update of the U.S. Geological Survey (USGS) National Seismic Hazard Model (NSHM) for the conterminous United States (2014 NSHM; Petersen and others, 2014, 2015) included probabilistic ground motion maps for 2 percent and 10 percent probabilities of exceedance in 50 years, derived from seismic hazard curves for peak ground acceleration (PGA) and 0.2 and 1.0 second spectral...
Authors
Allison Shumway, Mark D. Petersen, Peter M. Powers, Sanaz Rezaeian
Passive experimental warming decouples air and sediment temperatures in a salt marsh Passive experimental warming decouples air and sediment temperatures in a salt marsh
Open top chambers (OTCs) are a commonly used passive warming technique in experimental warming studies. OTCs have been shown to be effective in multiple types of terrestrial systems, but their utility in wetland environments remains uncertain. The objective of this work was to evaluate the effectiveness of using OTCs to warm a temperate salt marsh across diurnal and seasonal cycles. We...
Authors
Joanna C. Carey, Kevin D. Kroeger, Babak Zafari, Jianwu Tang
The 1952 Kern County, California earthquake: A case study of issues in the analysis of historical intensity data for estimation of source parameters The 1952 Kern County, California earthquake: A case study of issues in the analysis of historical intensity data for estimation of source parameters
Seismic intensity data based on first-hand accounts of shaking give valuable insight into historical and early instrumental earthquakes. Comparing an observed intensity distribution to intensity-prediction models based on modern calibration events allows the magnitude to be estimated for many historic earthquakes. Magnitude estimates can also potentially be refined for earthquakes for...
Authors
Leah Salditch, Susan E. Hough, Seth Stein, Bruce Spencer, Edward Brooks, James S. Neely, Madeleine C. Lucas
The 19 September 2017 M 7.1 Puebla‐Morelos earthquake: Spectral ratios confirm Mexico City zoning The 19 September 2017 M 7.1 Puebla‐Morelos earthquake: Spectral ratios confirm Mexico City zoning
One important element of understanding basin response to strong shaking is the analysis of spectral ratios, which may provide information about the dominant frequency of ground motion at specific locations. Spectral ratios computed from accelerations recorded by strong‐motion stations in Mexico City during the mainshock of the 19 September 2017 MM 7.1 Puebla‐Morelos earthquake reveal...
Authors
Mehmet Celebi, Valerie Jean Sahakian, Diego Melgar, Luis Quintanar
KG²B, a collaborative benchmarking exercise for estimating the permeability of the Grimsel granodiorite - Part 1: measurements, pressure dependence and pore-fluid effects KG²B, a collaborative benchmarking exercise for estimating the permeability of the Grimsel granodiorite - Part 1: measurements, pressure dependence and pore-fluid effects
Measuring the permeability of tight rocks remains a challenging task. In addition to the traditional sources of errors that affect more permeable formations (e.g. sample selection, non-representative specimens, disturbance introduced during sample acquisition and preparation), tight rocks can be particularly prone to solid–fluid interactions and thus more sensitive to the methods...
Authors
Christian David, J. Wasserman, F. Amann, David A. Lockner, E.H. Rutter, T Vanorio, A. Amann Hildenbrand, J. Billiotte, T. Reuschle, D. Lasseux, J. Fortin, R. Lenormand, A.P.S. Selvadurai, P.G. Meredith, J. Browning, T.M. Mitchell, D. Loggia, F. Nono, J. Sarout, L. Esteban, C. Davy, L. Louis, G. Boitnott, C. Madonna, E. Jahns, Fleury. M., G. Berthe, P. Delage, P. Braun, D. Gregoire, L. Perrier, P. Polito, Y. Jannot, A. Sommier, B. Krooss, R. Fink, Q. Hu, J.M. Klaver, A. Clark
Advantages and limitations to the use of optical measurements to study sediment properties Advantages and limitations to the use of optical measurements to study sediment properties
Measurements of optical properties have been used for decades to study particle distributions in the ocean. They are useful for estimating suspended mass concentration as well as particle-related properties such as size, composition, packing (particle porosity or density), and settling velocity. Measurements of optical properties are, however, biased, as certain particles, because of...
Authors
Emmanuel Boss, Christopher R. Sherwood, Paul Hill, Tim Milligan
A global empirical model for near real-time assessment of seismically induced landslides A global empirical model for near real-time assessment of seismically induced landslides
Earthquake-triggered landslides are a significant hazard in seismically active regions, but our ability to assess the hazard they pose in near real-time is limited. In this study, we present a new globally applicable model for seismically induced landslides based on the most comprehensive global dataset available; we use 23 landslide inventories that span a range of earthquake magnitudes...
Authors
M. Anna Nowicki Jessee, M.W. Hamburger, Kate E. Allstadt, David J. Wald, H. Tanyas, Mike Hearne, E.M. Thompson
Crustal inheritance and a top-down control on arc magmatism at Mount St Helens Crustal inheritance and a top-down control on arc magmatism at Mount St Helens
In a subduction zone, the volcanic arc marks the location where magma, generated via flux melting in the mantle wedge, migrates through the crust and erupts. While the location of deep magma broadly defines the arc position, here we argue that crustal structures, identified in geophysical data from the Washington Cascades magmatic arc, are equally important in controlling magma ascent...
Authors
Paul A. Bedrosian, Jared R. Peacock, Esteban Bowles-Martinez, Adam Schultz, Graham Hill
Field and laboratory hydraulic characterization of landslide-prone soils in the Oregon Coast Range and implications for hydrologic simulation Field and laboratory hydraulic characterization of landslide-prone soils in the Oregon Coast Range and implications for hydrologic simulation
Unsaturated zone flow processes are an important focus of landslide hazard estimation. Differences in soil hydraulic behavior between wetting and drying conditions (i.e., hydraulic hysteresis) may be important in landslide triggering. Hydraulic hysteresis can complicate soil hydraulic parameter estimates and impact prediction capability. This investigation focused on hydraulic property...
Authors
Brian A. Ebel, Jonathan W. Godt, Ning Lu, Jeffrey A. Coe, Joel B. Smith, Rex L. Baum
Induced earthquake families reveal distinctive evolutionary patterns near disposal wells Induced earthquake families reveal distinctive evolutionary patterns near disposal wells
The timing of events in seismic sequences can provide insights into the physical processes controlling fault slip. In southern Kansas, the rate of earthquakes rose rapidly starting in 2013 following expansion of energy production into the area, demanding the disposal of large volumes of wastewater into deep wells. Seismicity catalogs that are complete to low magnitudes can provide...
Authors
Elizabeth S. Cochran, Zachary E. Ross, Rebecca M. Harrington, Sara L. Dougherty, Justin L. Rubinstein
Research to improve ShakeAlert earthquake early warning products and their utility Research to improve ShakeAlert earthquake early warning products and their utility
Earthquake early warning (EEW) is the rapid detection of an earthquake and issuance of an alert or notification to people and vulnerable systems likely to experience potentially damaging ground shaking. The level of ground shaking that is considered damaging is defined by the specific application; for example, manufacturing equipment may experience damage at a lower intensity ground...
Authors
Elizabeth S. Cochran, Brad T. Aagaard, Richard M. Allen, Jennifer Andrews, Annemarie S. Baltay Sundstrom, Andrew J. Barbour, Paul Bodin, Benjamin A. Brooks, Angela Chung, Brendan W. Crowell, Douglas D. Given, Thomas C. Hanks, J. Renate Hartog, Egill Hauksson, Thomas H. Heaton, Sara K. McBride, Men-Andrin Meier, Diego Melgar, Sarah E. Minson, Jessica R. Murray, Jennifer A. Strauss, Douglas Toomey