Publications
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Paleoseismology and paleogeodesy using coral microatolls Paleoseismology and paleogeodesy using coral microatolls
Establishing the rupture extent and slip distribution of individual paleo-earthquakes is vital for assessing fault behavior including the persistence of rupture segmentation, recurrence patterns, and similarity of successive events, key issues in both fault mechanics and hazard assessment. Techniques with high temporal and geodetic precision as well as a wide distribution of study sites...
Authors
Belle E. Philibosian
Remote single-station seismic monitoring of the July–October 2022 earthquake swarm at Tau volcano, American Samoa Remote single-station seismic monitoring of the July–October 2022 earthquake swarm at Tau volcano, American Samoa
From July to October 2022, a non-eruptive volcanic earthquake swarm occurred within ~15 km of Taʻū Island, located in eastern American Samoa. Felt reports from local residents were the only available information about the swarm when it started, as American Samoa lacked a seismic monitoring network. We developed a consistent single-station catalog for the entire swarm, using seismic data...
Authors
Clara Yoon, Robert Skoumal, Andrew J. Michael, A.D. Jolly, Andria P. Ellis, Drew T. Downs, Peter Dotray, Natalia I. Deligne, Jefferson Chang, Ninfa Lucia Bennington, Aaron Wech, Matthew M. Haney, Alicia J. Hotovec-Ellis, Elinor Lutu-McMoore, Marcus Langkilde
A high-resolution 3-D P-wave velocity structure of the south-central Cascadia subduction zone from wide-angle shore-crossing seismic refraction data A high-resolution 3-D P-wave velocity structure of the south-central Cascadia subduction zone from wide-angle shore-crossing seismic refraction data
This study addresses a significant gap in understanding the features of the south-central Cascadia subduction zone, a region characterized by complex geologic, tectonic, and seismic transitions both offshore and onshore. Unlike other segments along this margin, this area lacks a 3-D velocity model to delineate its structural and geological features on a fine scale. To address this void...
Authors
Asif Ashraf, Emilie Hooft, Douglas Toomey, Anne Trehu, Sarah Nolan, Erin A. Wirth, Kevin M. Ward
Crater detection dependence on resolution, incidence angle, emission angle, and phase angle Crater detection dependence on resolution, incidence angle, emission angle, and phase angle
Impact crater population detection and measurement is critical to understanding solar system bodies and dynamics. However, the ability to detect all possible craters under different lighting and camera geometries has not been systematically studied except in a few limited cases. This work presents the first systematic study examining crater detection based on resolution, incidence angle...
Authors
Stuart J. Robbins, Michelle R. Kirchoff, Lillian R. Ostrach
Examining the role of elevated and sustained strain in dynamically triggering earthquakes on the Anza section of the San Jacinto fault Examining the role of elevated and sustained strain in dynamically triggering earthquakes on the Anza section of the San Jacinto fault
Microearthquakes can be dynamically triggered in southern California by remote earthquakes. However, directly connecting dynamic triggering mechanisms with observational data remains challenging. One proposed failure mechanism suggests that both the amplitude and duration of cyclic fatigue caused by the passing seismic wave contribute to triggering occurrence. Here, we measure dynamic...
Authors
Nicolas DeSalvio, Andrew J. Barbour, Wenyuan Fan
Long-term trends in microseismicity during operational shut-ins at the Coso Geothermal Field, California Long-term trends in microseismicity during operational shut-ins at the Coso Geothermal Field, California
Pausing injection and production can lead to induced seismicity in a variety of settings, with some of the largest events occurring during these so-called shut-ins. In geothermal fields, shut-ins are periodically conducted for maintenance on wells and surface infrastructure, thereby offering recurring means of estimating stress changes in the subsurface that lead to increased seismicity...
Authors
Joanna Holmgren, J. Ole Kaven, Volker Oye
ShakeAlert® version 3: Expected performance in large earthquakes ShakeAlert® version 3: Expected performance in large earthquakes
The ShakeAlert earthquake early warning (EEW) system partners along with U.S. Geological Survey (USGS) licensed operators deliver EEW alerts to the public and trigger automated systems when a significant earthquake is expected to impact California, Oregon, or Washington. ShakeAlert’s primary goal is to provide usable warning times before the arrival of damaging shaking. EEW is most...
Authors
Jeffrey J. McGuire, Carl W. Ulberg, Angela I. Lux, Maren Bose, J.R. Andrews, Deborah Smith, B. Crowell, Jessica R. Murray, I. Henson, R. Hartog, C. Felizardo, Minh Huynh, M. Aranha, Grace Alexandra Parker, Annemarie S. Baltay Sundstrom, Mark Hunter Murray, Glenn Biasi, Stephen Guiwits, Jessie K. Saunders, Andrew D. Good, V. Marcelo Santillan, C.W. Scrivener, Walter M. Szeliga, Timothy I. Melbourne, Victor Kress, Robert M. de Groot, Sara K. McBride, Douglas D. Given, Richard Allen, Thomas H. Heaton, Allen L. Husker, Valerie Thomas, Harold Tobin, Sumant Jha, Julian Bunn
Refined mapping of subsurface water ice on Mars to support future missions Refined mapping of subsurface water ice on Mars to support future missions
Mars has an extensive yet poorly understood cryosphere. Nevertheless, both direct and indirect evidence indicates extensive buried ice across the midlatitudes, including locations where it is presently unstable. While much progress has been made in exploring the processes responsible for ice deposition and preservation during recent climatic fluctuations, a global assessment of the...
Authors
Gareth A Morgan, Nathaniel E Putzig, David M H Baker, Asmin E. Pathare, Colin M. Dundas, Megan Russell, Matthew R Perry, Matthew Chojnacki, Hanna G Sizemore, Ali M Bramson, Eric I Petersen, Stefano Nerozzi, Rachel H Hoover, Zachary M Bain
Mapping bedrock outcrops in the Sierra Nevada Mountains (California, USA) using machine learning Mapping bedrock outcrops in the Sierra Nevada Mountains (California, USA) using machine learning
Accurate, high-resolution maps of bedrock outcrops can be valuable for applications such as models of land–atmosphere interactions, mineral assessments, ecosystem mapping, and hazard mapping. The increasing availability of high-resolution imagery can be coupled with machine learning techniques to improve regional bedrock outcrop maps. In the United States, the existing 30 m U.S...
Authors
Apoorva Ramesh Shastry, Corina Cerovski-Darriau, Brian Coltin, Jonathan D. Stock
What 25+ years of "Did You Feel It" intensities tell us about shaking in California What 25+ years of "Did You Feel It" intensities tell us about shaking in California
“When will the Big One happen?” is a question that people often have for earthquake scientists. But while waiting for the “Big One” to occur, people will usually experience frightening or damaging shaking from multiple relatively smaller‐magnitude earthquakes. Given this context, it raises the question: “Where does most of the damage come from?” Could smaller, yet more frequent...
Authors
Jenna Marie Chaffeur, Jessie K. Saunders, Sarah E. Minson, Annemarie S. Baltay Sundstrom, Elizabeth S. Cochran, Susan E. Hough, Vince Quitoriano, Morgan T. Page, James Luke Blair
3D viscoelastic models of slip-deficit rate along the Cascadia subduction zone 3D viscoelastic models of slip-deficit rate along the Cascadia subduction zone
Interseismic deformation in the Pacific Northwest is constrained by the horizontal crustal velocity field derived from the Global Positioning System (GPS) in addition to vertical rates derived from GPS, leveling, and tide gauge measurements. Such measurements were folded in to deformation models of fault slip rates as part of the 2023 National Seismic Hazard Model (NSHM) update. Here I...
Authors
Frederick Pollitz
Haunted Summerville: Ghostly lights or earthquake lights? Haunted Summerville: Ghostly lights or earthquake lights?
Among the colorful local lore in the Charleston, South Carolina, area, are a number of ghost stories, shared not only over campfires but also in published books. Among the most well-known of the stories is the tale of the Summerville Light. Local lore holds that a strange light sometimes seen in a remote area is a lantern carried by the ghost of a local woman who once waited hours for...
Authors
Susan E. Hough