Publications
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The GSN and large earthquakes
No abstract available.
Authors
Gavin P. Hayes, Hiroo Kanamori, Thorne Lay, Charles J. Ammon
Anomalously low strength of serpentinite sheared against granite and implications for creep on the Hayward and Calaveras Faults
Serpentinized ophiolitic rocks are juxtaposed against quartzofeldspathic rocks at depth across considerable portions of the Hayward and Calaveras Faults. The marked compositional contrast between these rock types may contribute to fault creep that has been observed along these faults. To investigate this possibility, we are conducting hydrothermal shearing experiments to look for changes in fricti
Authors
Diane E. Moore, David A. Lockner, David A. Ponce
Global earthquake casualties due to secondary effects: A quantitative analysis for improving PAGER losses
This study presents a quantitative and geospatial description of global losses due to earthquake-induced secondary effects, including landslide, liquefaction, tsunami, and fire for events during the past 40 years. These processes are of great importance to the US Geological Survey’s (USGS) Prompt Assessment of Global Earthquakes for Response (PAGER) system, which is currently being developed to del
Authors
Kristin Marano, David J. Wald, Trevor Allen
Tidal calibration of Plate Boundary Observatory borehole strainmeters: Roles of vertical and shear coupling
A multicomponent borehole strainmeter directly measures changes in the diameter of its cylindrical housing at several azimuths. To transform these measurements to formation strains requires a calibration matrix, which must be estimated by analyzing the installed strainmeter's response to known strains. Typically, theoretical calculations of Earth tidal strains serve as the known strains. This pape
Authors
Evelyn Roeloffs
Implementation of the Next Generation Attenuation (NGA) ground-motion prediction equations in Fortran and R
This report presents two methods for implementing the earthquake ground-motion prediction equations released in 2008 as part of the Next Generation Attenuation of Ground Motions (NGA-West, or NGA) project coordinated by the Pacific Earthquake Engineering Research Center (PEER). These models were developed for predicting ground-motion parameters for shallow crustal earthquakes in active tectonic re
Authors
James Kaklamanos, David M. Boore, Eric M. Thompson, Kenneth W. Campbell
Puget Sound shorelines and the impacts of armoring: Proceedings of a state of the science workshop, May 2009
The widespread extent and continued construction of seawalls and bulkheads on Puget Sound's beaches has emerged as a significant issue in shoreline management and coastal restoration in the region. Concerns about the impacts of shoreline armoring and managing the potential risks to coastal property are in many ways similar to those in other places, but Puget Sound also poses unique challenges rela
Remotely sensed imagery revealing the effects of hurricanes Gustav and Ike on coastal Louisiana
Hurricane Gustav, a category 2 storm with 170 kilometers per hour (km/h) winds, approached the Louisiana coast from the south-southeast, making landfall near Cocodrie, La., on September 1, 2008 (Beven and Kimberlain, 2009); Hurricane Ike, a category 2 storm with 175 km/h winds, approached the Texas coast from the southeast, paralleling offshore of the Louisiana coast, before making landfall along
Authors
John A. Barras, John Brock, Robert A. Morton, Laurinda J. Travers
Orientation-independent, nongeometric-mean measures of seismic intensity from two horizontal components of motion
New measures of spectral intensity based on the horizontal components of ground shaking are introduced. These new measures are independent of the in situ orientation of the recordings and encompass the full range of spectral amplitudes over all possible rotation angles. Unlike previously introduced measures that are also orientation independent, no geometric means are used in the computation of th
Authors
David M. Boore
Introduction to special section on phenomenology, underlying processes, and hazard implications of aseismic slip and nonvolcanic tremor
This paper introduces the special section on the "phenomenology, underlying processes, and hazard implications of aseismic slip and nonvolcanic tremor" by highlighting key results of the studies published in it. Many of the results indicate that seismic and aseismic manifestations of slow slip reflect transient shear displacements on the plate interface, with the outstanding exception of northern
Authors
Joan Gomberg
Effects of soil aggregates on debris-flow mobilization: Results from ring-shear experiments
Rates and styles of landslide motion are sensitive to pore-water pressure changes caused by changes in soil porosity accompanying shear deformation. Soil may either contract or dilate upon shearing, depending upon whether its initial porosity is greater or less, respectively, than a critical-state porosity attained after sufficiently high strain. We observed complications in this behavior, however
Authors
Neal R. Iverson, Janet E. Mann, Richard M. Iverson
Fault zone structure from topography: signatures of en echelon fault slip at Mustang Ridge on the San Andreas Fault, Monterey County, California
We used high-resolution topography to quantify the spatial distribution of scarps, linear valleys, topographic sinks, and oversteepened stream channels formed along an extensional step over on the San Andreas Fault (SAF) at Mustang Ridge, California. This location provides detail of both creeping fault landform development and complex fault zone kinematics. Here, the SAF creeps 10–14 mm/yr slower
Authors
Stephen B. DeLong, George E. Hilley, Michael J. Rymer, Carol Prentice
Infrasonic harmonic tremor and degassing bursts from Halema'uma'u Crater, Kilauea Volcano, Hawaii
The formation, evolution, collapse, and subsequent resurrection of a vent within Halema'uma'u Crater, Kilauea Volcano, produced energetic and varied degassing signals recorded by a nearby infrasound array between 2008 and early 2009. After 25 years of quiescence, a vent-clearing explosive burst on 19 March 2008 produced a clear, complex acoustic signal. Near-continuous harmonic infrasonic tremor f
Authors
David Fee, Milton Garcés, Matt Patrick, Bernard Chouet, Phil Dawson, Donald A. Swanson