Jeffrey Joseph McGuire
Science and Products
What if the ShakeAlert Earthquake Early Warning System Had Been Operating During the M6.9 1989 Loma Prieta Earthquake?
How will ShakeAlert® likely perform now on a large earthquake impacting a major urban area? How much warning will you get? To answer this, let’s do a thought experiment...
Expected warning times from the ShakeAlert earthquake early warning system for earthquakes in the Pacific Northwest
The ShakeAlert® earthquake early warning system has been live since October 2019 for the testing of public alerting to mobile devices in California and will soon begin testing this modality in Oregon and Washington. The Pacific Northwest presents new challenges and opportunities for ShakeAlert owing to the different types of earthquakes that occur...
McGuire, Jeffrey J.; Smith, Deborah E.; Frankel, Arthur D.; Wirth, Erin A.; McBride, Sara K.; de Groot, Robert M.
ShakeAlert Earthquake Early Warning System Performance During the 2019 Ridgecrest Earthquake Sequence
During July 2019, a sequence of earthquakes including a Mw6.4 foreshock and a Mw7.1 mainshock occurred near Ridgecrest, California. ShakeAlert, the U.S. Geological Survey (USGS) ShakeAlert public Earthquake Early Warning (EEW) system being developed for the U.S. West Coast, was operational during this time, though public alerting was only...
Chung, Angela; Meier, Men-Andrin; Andrews, Jennifer; Böse, Maren; Crowell, Brendan; McGuire, Jeffrey; Smith, Deborah New opportunities to study earthquake precursors
No abstract available.
Pritchard, M. E.; Allen, R. M.; Becker, T. W.; Behn, M. D.; Brodsky, E. E.; Burgmann, R.; Ebinger, C.; Freymueller, J. T.; Gerstenberger, M. C.; Haines, B.; Kaneko, Y.; Jacobsen, S. D.; Lindsey, N.; McGuire, Jeffrey; Page, Morgan T.; Ruiz, S.; Tolstoy, M.; Wallace, L.; Walter, W. R.; Wilcock, W.; Vincent, H. Abundant spontaneous and dynamically triggered submarine landslides in the Gulf of Mexico
Submarine landslides that occur offshore are common along the U.S. continental margins. These mass wasting events can trigger tsunamis and hence potentially devastate coastal communities and damage offshore infrastructure. However, the initiation and failure processes of submarine landslides are poorly understood. Here, we identify and locate 85...
Fan, Wenyuan; McGuire, Jeffrey; Shearer, Peter M. Aseismic transient slip on the Gofar transform fault, East Pacific Rise
Oceanic transform faults display a unique combination of seismic and aseismic slip behavior, including a large globally averaged seismic deficit, and the local occurrence of repeating magnitude (M) ∼6">∼6∼6 earthquakes with abundant foreshocks and seismic swarms, as on the Gofar transform of the East Pacific Rise and the...
Liu, Yajing; McGuire, Jeffrey; Behn, Mark Semiautomated estimates of directivity and related source properties of small to moderate southern California earthquakes using second seismic moments
We develop a semiautomated method for estimating with second seismic moments the directivity, rupture area, duration, and centroid velocity of earthquakes. The method is applied to 41 southern California earthquakes with magnitude in the range 3.5–5.2 and provides stable results for 28 events. Apparent source time functions (ASTFs) of P ...
Meng, Haoran; McGuire, Jeffrey; Ben-Zion, Yehuda Stormquakes
Seismic signals from ocean-solid Earth interactions are ubiquitously recorded on our planet. However, these wavefields are typically incoherent in most frequency bands limiting their utilization for understanding ocean dynamics or solid Earth properties. In contrast, we find that during large storms such as hurricanes and Nor’easters the...
Fan, Wenyuan; McGuire, Jeffrey; de Groot-Hedlin, C. D.; Hedlin, M. A. H.; Coats, S.; Fiedler, J. W. Stress rotation across the Cascadia megathrust requires a weak subduction plate boundary at seismogenic depths
The Mendocino Triple Junction region is the most seismically active part of the Cascadia Subduction Zone. The northward moving Pacific plate collides with the subducting Gorda plate causing intense internal deformation within it. Here we show that the stress field rotates rapidly with depth across the thrust interface from a strike-slip regime...
Li, Duo; McGuire, Jeffrey J.; Liu, Yajing; Hardebeck, Jeanne L. Genetic assessment of the effects of streamscape succession on coho salmon Oncorhynchus kisutch colonization in recently deglaciated streams
Measures of genetic diversity within and among populations and historical geomorphological data on stream landscapes were used in model simulations based on approximate Bayesian computation (ABC) to examine hypotheses of the relative importance of stream features (geomorphology and age) associated with colonization events and gene flow for coho...
Scribner, Kim T.; Soiseth, Chad; McGuire, Jeffrey J.; Sage, G. Kevin; Thorsteinson, Lyman K.; Nielsen, J. L.; Knudsen, E. Observations of seismicity and ground motion in the northeast U.S. Atlantic margin from ocean bottom seismometer data
Earthquake data from two short-period ocean-bottom seismometer (OBS) networks deployed for over a year on the continental slope off New York and southern New England were used to evaluate seismicity and ground motions along the continental margin. Our OBS networks located only one earthquake of Mc∼1.5 near the shelf edge during six months of...
Flores, Claudia; ten Brink, Uri S.; McGuire, Jeffrey J.; Collins, John A. Relationships among seismic velocity, metamorphism, and seismic and aseismic fault slip in the Salton Sea Geothermal Field region
The Salton Sea Geothermal Field is one of the most geothermally and seismically active areas in California and presents an opportunity to study the effect of high-temperature metamorphism on the properties of seismogenic faults. The area includes numerous active tectonic faults that have recently been imaged with active source seismic reflection...
McGuire, Jeffrey J.; Lohman, Rowena B.; Catchings, Rufus D.; Rymer, Michael J.; Goldman, Mark R. Detecting aseismic strain transients from seismicity data
Aseismic deformation transients such as fluid flow, magma migration, and slow slip can trigger changes in seismicity rate. We present a method that can detect these seismicity rate variations and utilize these anomalies to constrain the underlying variations in stressing rate. Because ordinary aftershock sequences often obscure changes in the...
Llenos, Andrea L.; McGuire, Jeffrey
What if the ShakeAlert Earthquake Early Warning System Had Been Operating During the M6.9 1989 Loma Prieta Earthquake?
How will ShakeAlert® likely perform now on a large earthquake impacting a major urban area? How much warning will you get? To answer this, let’s do a thought experiment...
Read the new Science for Everyone article at What if the ShakeAlert Earthquake Early Warning System...