Publications
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Using component ratios to detect metadata and instrument problems of seismic stations: Examples from 18 years of GEOSCOPE data
Replacement or deterioration of seismic instruments and the evolution of the installation conditions and sites can alter the seismic signal in very subtle ways, so it is notoriously difficult to monitor the signal quality of permanent seismic stations. We present a simple tool, energy ratios between each pair of the three recorded components, aimed at characterizing and monitoring signal quality,
Authors
Helle A. Pedersen, Nicolas Leroy, Dimitri Zigone, Martin Vallée, Adam T. Ringler, David C. Wilson
Ground-motion amplification in Cook Inlet region, Alaska from intermediate-depth earthquakes, including the 2018 MW=7.1 Anchorage earthquake
We measure pseudospectral and peak ground motions from 44 intermediate‐depth Mw≥4.9 earthquakes in the Cook Inlet region of southern Alaska, including those from the 2018 Mw 7.1 earthquake near Anchorage, to identify regional amplification features (0.1–5 s period). Ground‐motion residuals are computed with respect to an empirical ground‐motion model for intraslab subduction earthquakes, and we
Authors
Morgan P. Moschetti, Eric M. Thompson, John Rekoske, Mike Hearne, Peter M. Powers, Daniel E. McNamara, Carl Tape
The (mythical) M8.2 off coast of Peru earthquake of 12 December 1908
Global earthquake catalogs covering the early twentieth century differ in their listings of a large earthquake, or earthquakes, on 12 December 1908. Some catalogs list an M∼7M∼7 earthquake originating in northern Myanmar (Burma) at ∼12:55∼12:55 UTC on that date. Other catalogs do not list the Myanmar origin but list an earthquake with magnitude 8.2 originating in or near Peru at 12:08 UTC on the d
Authors
Domenico Di Giacomo, James W. Dewey
Directivity of M 3.1 earthquake near Anza, California and the effect on peak ground motion
We show the effect of rupture directivity on peak ground‐motion values for a moderate magnitude event at Anza, California, and neighboring stations at the Imperial Valley. The event was located near Borrego Springs on the west side of the Salton Sea and was well recorded at broadband stations near Anza, California, and at stations on the west side of the Imperial Valley. After correcting for regio
Authors
Jon Peter B. Fletcher, John Boatwright
On the utilization of synthetic and measured earthquake ground motions for designing building monitoring systems in the near-field of major faults
Agencies and research groups engaged in studying measures for enhancing the resiliency of communities have recently placed emphasis on the need for extensive implementation of monitoring systems for rapid post-event assessment of structural integrity. Designing a monitoring system for a building requires a thorough knowledge of its potential nonlinear dynamic behavior with an associated localizati
Authors
Floriana Petrone, David McCallen, Mehmet Çelebi
#EarthquakeAdvisory: Exploring discourse between government officials, news media and social media during the Bombay Beach 2016 Swarm
Communicating probabilities of natural hazards to varied audiences is a notoriously difficult task. Many of these challenges were encountered during the 2016 Bombay Beach, California, swarm of ~100 2≤M≤4.3 earthquakes, which began on 26 September 2016 and lasted for several days. The swarm’s proximity to the southern end of the San Andreas fault caused concern that a larger earthquake could be tri
Authors
Sara McBride, Andrea L. Llenos, Morgan T. Page, Nicholas van der Elst
Precision of VS30 values derived from noninvasive surface wave methods at 31 sites in California
We study the inter- and intra-method variability of VS30 results by inverting/forward-modeling individual dispersion data for 31 seismographic stations located in California where combinations of surface-wave methods were applied and the minimum recorded wavelength from each method satisfies the 30-meter depth criteria. These methods consist of noninvasive geophysical (active and passive surface-
Authors
Alan K. Yong, Antony Martin, Jack Boatwright
The behavior of the Salesforce Tower, the tallest building in San Francisco, California inferred from earthquake and ambient shaking
The newly constructed tallest building designed in conformance with performance-based design procedure in San Francisco, California is a 61-story building equipped with an accelerometric array that recorded the January 4, 2018 M4.4 Berkeley earthquake. The building is designed with concrete core shear walls and perimeter gravity steel columns. The earthquake records as well as on-demand recorded a
Authors
Mehmet Çelebi, Hamid Haddadi, Moh Huang, Michael Valley, John Hooper, Klemencic. Ron
The susceptibility of Oklahoma’s basement to seismic reactivation
Recent widespread seismicity in Oklahoma is attributed to the reactivation of pre-existing, critically stressed and seismically unstable faults due to decades of wastewater injection. However, the structure and properties of the reactivated faults remain concealed by the sedimentary cover. Here, we explore the major ingredients needed to induce earthquakes in Oklahoma by characterizing basement fa
Authors
Folarin Kolawole, C.S. Johnston, C.B. Morgan, Jefferson Chang, K Marfurt, David A. Lockner, Ze'ev Reches, B M Carpenter
The LArge-n Seismic Survey in Oklahoma (LASSO) experiment
In 2016, the U.S. Geological Survey deployed more than 1,800 vertical-component nodal seismometers in Grant County, Oklahoma to study induced seismic activity associated with production of the Mississippi Limestone Play. The LArge-n Seismic Survey in Oklahoma (LASSO) array operated for approximately one month, covering a 25-km-by-32-km region with a nominal station spacing of ~400 m. Primary goal
Authors
S. Dougherty, Elizabeth S. Cochran, R. M. Harrington
Late Quaternary slip rate of the Central Sierra Madre fault, southern California: Implications for slip partitioning and earthquake hazard
The Sierra Madre fault system accommodates contraction within a large restraining bend area of the San Andreas fault along the northern margin of the Los Angeles metropolitan area in Southern California. Reverse slip along this fault system during earthquakes controls growth of the San Gabriel Mountains and poses a significant seismic hazard to the region. Here, we measure the late Quaternary slip
Authors
Reed J. Burgette, Austin Hanson, Katherine Scharer, Tammy M. Rittenour, Devin McPhillips
Coseismic slip and early afterslip of the M6.0 August 24, 2014 South Napa, California, earthquake
We employ strong motion seismograms and static offsets from the Global Positioning System, Interferometric Synthetic Aperture Radar, and other measurements in order to derive a coseismic slip and afterslip model of the M6.0 24 August 2014 South Napa earthquake. This earthquake ruptured an ∼13‐km‐long portion of the West Napa fault with predominantly right‐lateral strike slip. In the kinematic seis
Authors
Fred Pollitz, Jessica R. Murray, Sarah E. Minson, Charles W. Wicks, Jerry L. Svarc, Benjamin A. Brooks