Publications
Educational Publications
Educational Publications
Selected publications about earthquakes In plain language.
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Evidence for fluid pressurization of fault zones and persistent sensitivity to injection rate beneath the Raton Basin Evidence for fluid pressurization of fault zones and persistent sensitivity to injection rate beneath the Raton Basin
Subsurface wastewater injection has increased the seismicity rate within the Raton Basin over more than two decades, with the basin-wide injection rate peaked between 2009-2015. To understand the evolution of injection-induced earthquakes, we systematically analyzed 2016-2024 broadband recordings with a machine-learning-based phase picker and constructed a catalog with 95,993 earthquakes...
Authors
Mohammadreza Jamalreyhani, Ruijia Wang, Brandon Schmandt, Andres Felipe Peña Castro, Margaret Glasgow
Estimating earthquake source depth using teleseismic broadband waveform modeling at the USGS National Earthquake Information Center Estimating earthquake source depth using teleseismic broadband waveform modeling at the USGS National Earthquake Information Center
The U.S. Geologic Survey National Earthquake Information Center (NEIC) monitors global seismicity, producing a catalog of earthquake source parameters in near-real-time to provide information that can help mitigate the societal impact of earthquakes. The NEIC commonly relies on teleseismic observations to constrain earthquake source parameters (e.g., location, depth, magnitude, and...
Authors
William Yeck, Robert B. Herrmann, John Patton, William Barnhart, Harley Benz
A newly identified creeping strand of the Concord fault, San Francisco Bay Area A newly identified creeping strand of the Concord fault, San Francisco Bay Area
The Concord fault constitutes a major branch of the Pacific–North America transform plate boundary in Northern California, bridging the strike‐slip Bartlett Springs ‐ Green Valley Fault system to the north with the Greenville and Calaveras Faults to the south. Like many faults in the San Francisco Bay Area its long‐term slip is partially accommodated by aseismic slip (creep). Although...
Authors
Austin Elliott, Danielle Madugo, Jessica Vermeer
False positives in the identification of dynamic earthquake triggering False positives in the identification of dynamic earthquake triggering
Dynamic earthquake triggering is commonly identified through the temporal correlation between increased seismicity rates and global earthquakes that are possible triggering events. However, correlation does not imply causation. False positives may occur when unrelated seismicity rate changes coincidently occur at around the time of candidate triggers. We investigate the expected false...
Authors
Jeanne Hardebeck, Nicolas D. DeSalvio, Wenyuan Fan, Andrew Barbour
Impact of gas/liquid phase change of CO2 during injection for sequestration Impact of gas/liquid phase change of CO2 during injection for sequestration
CO2 sequestration in deep saline formations is an effective and important process to control the rapid rise in CO2 emissions. The process of injecting CO2 requires reliable predictions of the stress in the formation and the fluid pressure distributions – particularly since monitoring of the CO2 migration is difficult – to mitigate leakage, prevent induced seismicity, and analyze wellbore...
Authors
M. Karimi, Elizabeth Cochran, Mehrdad Massoudi, Noel Walkington, Matteo Pozzi, Kaushik Dayal
High-pass corner frequency selection and review tool for use in ground-motion processing High-pass corner frequency selection and review tool for use in ground-motion processing
Raw seismological waveform data contain noise from the instrument’s surroundings and the instrument itself that can dominate recordings at low and high frequencies. To use these data in ground‐motion modeling, the effects of noise on the signals must be reduced and the signals’ usable frequency range identified. We present automated procedures to efficiently reduce low‐frequency noise...
Authors
Maria Ramos-Sepulveda, Scott Brandenberg, Tristan Buckreis, Grace Parker, Jonathan P. Stewart
An empirical Green’s function approach for isolating directivity effects in earthquake ground-motion amplitudes An empirical Green’s function approach for isolating directivity effects in earthquake ground-motion amplitudes
In this study, we apply an empirical Green’s function (eGf) method within a ground‐motion modeling framework to mitigate trade‐offs between source, path, and site effects. Many physical processes contribute to spatial variations in observed ground motions, including earthquake radiation pattern, directivity, variable path attenuation, and site effects. Current nonergodic ground‐motion...
Authors
Grace Parker, Annemarie Baltay Sundstrom, Evan Hirakawa
Meet the people where they are: Assessing user needs for aftershock forecast products in El Salvador, Mexico and the United States Meet the people where they are: Assessing user needs for aftershock forecast products in El Salvador, Mexico and the United States
Aftershock forecasts can help communities reduce their seismic risk by conveying how many aftershocks can be expected following a large earthquake, and how the expected number of aftershocks and their corresponding ground shaking evolves over time and space. Prior work finds that graphical forecast products may communicate such information better than only text or numbers. To identify...
Authors
Max Schneider, Anne Wein, Sara K. McBride, Nicholas van der Elst, Julia Becker, Raul Castro, Manuel Diaz, Hector Gonzalez-Huizar, Jeanne Hardebeck, Andrew Michael, Luis Mixco, Morgan Page
Bayesian ETAS modeling for the Pacific Northwest: Uncovering effects of tectonic regimes, regional differences, and swarms on aftershock parameters Bayesian ETAS modeling for the Pacific Northwest: Uncovering effects of tectonic regimes, regional differences, and swarms on aftershock parameters
The Pacific Northwest (PNW) of North America has high seismic hazard due to numerous earthquake sources under populated areas. It hosts several tectonic regimes and subregional seismic zones that are hypothesized to have different patterns of earthquake and aftershock occurrence. It is also predisposed to earthquake swarms, which can complicate the statistical modeling of these patterns...
Authors
Max Schneider, Michael Barall, Peter Guttorp, Jeanne Hardebeck, Andrew Michael, Morgan Page, Nicholas van der Elst
Dendroseismological investigation of redwood trees along the North Coast section of the San Andreas Fault Dendroseismological investigation of redwood trees along the North Coast section of the San Andreas Fault
Sequoia sempervirens (coast redwood) tree rings have the potential to annually resolve late-Holocene earthquakes on the northern San Andreas Fault based on direct (e.g., physical damage) and indirect (e.g., co-seismic environmental change) impacts, but scarcity of suitable samples and challenges crossdating this long-lived species have limited progress. More precise dating of the pre...
Authors
Allyson Carroll, Belle Philibosian, Stephen C. Sillett, Marie E. Antoine, Özgür Kozaci
Factors influencing landslide occurrence in low-relief formerly glaciated landscapes: Landslide inventory and susceptibility analysis in Minnesota, USA Factors influencing landslide occurrence in low-relief formerly glaciated landscapes: Landslide inventory and susceptibility analysis in Minnesota, USA
In landscapes recently impacted by continental glaciation, landslides may occur where topographic relief has been generated by the drainage of glacial lakes and ensuing post-glacial fluvial network development into unconsolidated glacially derived sediments and exhumed bedrock. To investigate linkages among environmental variables, post-glacial landscape development, and landslides, we...
Authors
Laura Triplett, Morena Hammer, Stephen DeLong, Karen Gran, Carrie Jennings, Zachary Engle, Julie K. Bartley, Dylan J. Blumentritt, Andy Breckenridge, Stephanie Day, Melissa A. Kohout, Philip H. Larson, Jeni A. McDermott, Emilie Richard
Overview of The SCEC/USGS Community Stress Drop Validation Study using the 2019 Ridgecrest earthquake sequence Overview of The SCEC/USGS Community Stress Drop Validation Study using the 2019 Ridgecrest earthquake sequence
We present initial findings from the ongoing Community Stress Drop Validation Study to compare spectral stress‐drop estimates for earthquakes in the 2019 Ridgecrest, California, sequence. This study uses a unified dataset to independently estimate earthquake source parameters through various methods. Stress drop, which denotes the change in average shear stress along a fault during...
Authors
Rachel Abercrombie, Annemarie Baltay Sundstrom, Shanna Chu, Taka’aki Taira, Dino Bindi, Oliver Boyd, Xiaowei Chen, Elizabeth Cochran, Emma Devin, Douglas Dreger, William Ellsworth, Fan Wenyuan, Rebecca Harrington, Yihe Huang, Kilian Kemna, Meichen Liu, Adrien Oth, Grace Parker, Colin Pennington, Matteo Picozzi, Christine J. Ruhl, Peter Shearer, Daniele Spallarossa, Daniel Trugman, Ian Vandevert, Qimin Wu, Clara Yoon, Ellen Yu, Gregory Beroza, Tom Eulenfeld, Trey Knudson, Kevin Mayeda, Paola Morasca, James Neely, Jorge I. Roman-Nieves, Claudio Satriano, Mariano Supino, William Walter, Ralph Archuleta, Gail Marie Atkinson, Giovanna Calderoni, Chen Ji, Hongfeng Yang, Jiewen Zhang