Open dialogue about important issues in earthquake science presented by Center scientists, visitors, and invitees.
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Combining earthquake and tsunami early warnings along the west coast of the United States
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Amy Williamson, University of California Berkeley Alerts sent through earthquake early warning (EEW) programs provide precious seconds for those alerted to take simple protective actions to mitigate their seismic risk. Programs like ShakeAlert have been providing alerts for felt earthquakes across the west coast of the US for almost 5 years. Earthq…
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Splay fault dynamics at subduction and rift margins: insight from 3D dynamic rupture modeling of the Cascadia megathrust and the Mai’iu low-angle normal fault
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James Biemiller, USGS An unresolved aspect of tsunami generation in great subduction earthquakes is the offshore competition between coseismic deformation mechanisms, such as shallow megathrust slip, slip on one or more splay faults, and off-fault plastic deformation. In this presentation, we first review results from data-constrained 3D dynamic ru…
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How Fault Network Geometry Affects Earthquakes
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Jaeseok Lee, Brown University Field observations indicate that fault systems are structurally complex, yet fault slip behavior has predominantly been attributed to local fault plane properties, such as friction parameters and roughness. Although relatively unexplored, emerging observations highlight the importance of fault system geometry in the me…
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Historical Seismic Data for the Future: Preservation, Digitization, and Utility
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Thomas Lee, Harvard University Since the first seismograms were recorded in the late 19th century, the seismological community has accumulated millions of ground motion records on both paper and film. While almost all analog seismic recording ended by the late 20th century, replaced by digital media, the still-extant archives of paper and film seis…
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Marsquake Focal Mechanisms from InSight Data: Understanding the Seismotectonics of Mars
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Ross Maguire, University of Illinois Urbana-Champaign Seismic source parameters – including hypocentral locations and focal mechanism solutions – provide the most direct constraints for understanding tectonic stresses and deformation processes within planetary interiors. The SEIS (Seismic Experiment for Interior Structure) seismometer d…
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Decadal Creep-rate Changes Along the Hayward Fault
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Roland Burgmann, University of California Berkeley Decadal changes in aseismic fault slip rate on partially coupled faults reflect long-term changes in fault loading and/or fault-frictional properties that can be related to earthquake cycle processes. We consider constraints on aseismic fault slip rates from historical alignment array measurements,…
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MyShake: Crowdsourced Data for Ground Motion Modeling and Earthquake Early Warning Performance Assessment
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Savvas Marcou, University of California Berkeley MyShake is a free smartphone application, developed at UC Berkeley, that serves as one of the main delivery mechanisms for earthquake early warning (EEW) alerts issued to the US West Coast by the USGS ShakeAlert system. While it is most well-known for delivering alerts to the public, MyShake was orig…
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Physical process of earthquake nucleation from extremely shallow seismic events in Southeastern U.S.
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Zhigang Peng, Georgia Institute of Technology Earthquakes are not frequent in the Southeastern United States (SEUS), but they do occur in areas with long-term seismic activity and in new regions with no clear seismic history. Most of these earthquakes have relatively small magnitudes (less than 1) and are therefore not well recorded by the current …
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An upper-crust lid over the Long Valley magma chamber revealed by fiber tomography
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Ettore Biondi, California Institute of Technology Traveltime-based tomographic methods have been extensively explored and employed by researchers since the 80s. Such algorithms have been successfully applied to various geophysical applications, ranging from seismic exploration to global to regional seismological scales. However, given the advanceme…
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Cascadia’s frontal thrust fault system revealed in unprecedented detail
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Janet Watt, U.S. Geological Survey Investigating the geologic record of shallow megathrust behavior is imperative for estimating the earthquake hazard and tsunamigenic potential along the Cascadia subduction zone. Ship-borne sparker seismic imaging and multibeam mapping is integrated with targeted autonomous underwater vehicle (AUV) bathymetry and …
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