Publications
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Cascadia subducting plate fluids channelled to fore-arc mantle corner: ETS and silica deposition
In this study we first summarize the constraints that on the Cascadia subduction thrust, there is a 70 km gap downdip between the megathrust seismogenic zone and the Episodic Tremor and Slip (ETS) that lies further landward; there is not a continuous transition from unstable to conditionally stable sliding. Seismic rupture occurs mainly offshore for this hot subduction zone. ETS lies onshore. We t
Authors
Roy D. Hyndman, Patricia A. McCrory, Aaron Wech, Han Kao, Jay Ague
Vertical deformation through a complete seismic cycle at Isla Santa María, Chile
Individual great earthquakes are posited to release the elastic strain energy that has accumulated over centuries by the gradual movement of tectonic plates1, 2. However, knowledge of plate deformation during a complete seismic cycle—two successive great earthquakes and the intervening interseismic period—remains incomplete3. A complete seismic cycle began in south-central Chile in 1835 with an ea
Authors
Robert L. Wesson, Daniel Melnick, Marco Cisternas, Marcos Moreno, Lisa Ely
A century of oilfield operations and earthquakes in the greater Los Angeles Basin, southern California
Most of the seismicity in the Los Angeles Basin (LA Basin) occurs at depth below the sediments and is caused by transpressional tectonics related to the big bend in the San Andreas fault. However, some of the seismicity could be associated with fluid extraction or injection in oil fields that have been in production for almost a century and cover ∼ 17% of the basin. In a recent study, first the in
Authors
Egill Hauksson, Thomas Goebel, Jean-Paul Ampuero, Elizabeth S. Cochran
Improved rapid magnitude estimation for a community-based, low-cost MEMS accelerometer network
Immediately following the Mw 7.2 Darfield, New Zealand, earthquake, over 180 Quake‐Catcher Network (QCN) low‐cost micro‐electro‐mechanical systems accelerometers were deployed in the Canterbury region. Using data recorded by this dense network from 2010 to 2013, we significantly improved the QCN rapid magnitude estimation relationship. The previous scaling relationship (Lawrence et al., 2014) did
Authors
Angela Chung, Elizabeth S. Cochran, Anna E. Kaiser, Carl M. Christensen, Battalgazi Yildirim, Jesse F. Lawrence
On the reliability of Quake-Catcher Network earthquake detections
Over the past two decades, there have been several initiatives to create volunteer‐based seismic networks. The Personal Seismic Network, proposed around 1990, used a short‐period seismograph to record earthquake waveforms using existing phone lines (Cranswick and Banfill, 1990; Cranswicket al., 1993). NetQuakes (Luetgert et al., 2010) deploys triaxial Micro‐Electromechanical Systems (MEMS) sensors
Authors
Battalgazi Yildirim, Elizabeth S. Cochran, Angela Chung, Carl M. Christensen, Jesse F. Lawrence
Increasing seismicity in the U. S. midcontinent: Implications for earthquake hazard
Earthquake activity in parts of the central United States has increased dramatically in recent years. The space-time distribution of the increased seismicity, as well as numerous published case studies, indicates that the increase is of anthropogenic origin, principally driven by injection of wastewater coproduced with oil and gas from tight formations. Enhanced oil recovery and long-term producti
Authors
William L. Ellsworth, Andrea L. Llenos, Arthur F. McGarr, Andrew J. Michael, Justin L. Rubinstein, Charles S. Mueller, Mark D. Petersen, Eric Calais
Postearthquake relaxation evidence for laterally variable viscoelastic structure and water content in the Southern California mantle
I reexamine the lower crust and mantle relaxation following two large events in the Mojave Desert: the 1992 M7.3 Landers and 1999 M7.1 Hector Mine, California, earthquakes. Time series from continuous GPS sites out to 300 km from the ruptures are used to constrain models of postseismic relaxation. Crustal motions in the Mojave Desert region are elevated above background for several years following
Authors
Fred Pollitz
Updating the USGS seismic hazard maps for Alaska
The U.S. Geological Survey makes probabilistic seismic hazard maps and engineering design maps for building codes, emergency planning, risk management, and many other applications. The methodology considers all known earthquake sources with their associated magnitude and rate distributions. Specific faults can be modeled if slip-rate or recurrence information is available. Otherwise, areal sources
Authors
Charles Mueller, Richard W. Briggs, Robert L. Wesson, Mark D. Petersen
Surface monitoring of microseismicity at the Decatur, Illinois, CO2 sequestration demonstration site
Sequestration of CO2 into subsurface reservoirs can play an important role in limiting future emission of CO2 into the atmosphere (e.g., Benson and Cole, 2008). For geologic sequestration to become a viable option to reduce greenhouse gas emissions, large-volume injection of supercritical CO2 into deep sedimentary formations is required. These formations offer large pore volumes and good pore conn
Authors
J. Ole Kaven, Stephen H. Hickman, Arthur F. McGarr, William L. Ellsworth
Dynamic rupture models of earthquakes on the Bartlett Springs Fault, Northern California
The Bartlett Springs Fault (BSF), the easternmost branch of the northern San Andreas Fault system, creeps along much of its length. Geodetic data for the BSF are sparse, and surface creep rates are generally poorly constrained. The two existing geodetic slip rate inversions resolve at least one locked patch within the creeping zones. We use the 3-D finite element code FaultMod to conduct dynamic r
Authors
Julian C. Lozos, Ruth A. Harris, Jessica R. Murray, James J. Lienkaemper
Stress- and structure-controlled anisotropy in a region of complex faulting—Yuha Desert, California
We examine shear velocity anisotropy in the Yuha Desert, California using aftershocks of the 2010 M7.2 El Mayor-Cucapah earthquake. The Yuha Desert is underlain by a complex network of right- and left-lateral conjugate faults, some of which experienced triggered slip during the El Mayor-Cucapah earthquake. An automated method that implements multiple measurement windows and a range of bandpass fil
Authors
Elizabeth S. Cochran, Kayla A. Kroll
Efforts to monitor and characterize the recent increasing seismicity in central Oklahoma
The sharp increase in seismicity over a broad region of central Oklahoma has raised concerns regarding the source of the activity and its potential hazard to local communities and energy-industry infrastructure. Efforts to monitor and characterize the earthquake sequences in central Oklahoma are reviewed. Since early 2010, numerous organizations have deployed temporary portable seismic stations in
Authors
Daniel E. McNamara, Justin L. Rubinstein, Emma Myers, Gregory M. Smoczyk, Harley M. Benz, Robert Williams, Gavin P. Hayes, David C. Wilson, Robert B. Herrmann, Nicole D McMahon, R.C. Aster, E. Bergman, Austin Holland, Paul S. Earle