![]() Click on an earthquake on the above map for a zoomed-in view. ![]() These results reinforce the notion that both the southernmost Cascadia megathrust and the smaller fore‐arc faults above it contribute to regional seismic hazard. Recent Earthquakes in California and Nevada. We also find that 6–17 mm/yr of right‐lateral slip deficit extends north of the MTJ and into the southern Cascadia fore‐arc. Modeling of the horizontal and vertical velocities suggests that the southernmost CSZ is coupled interseismically to deeper than 25 km depth. Results indicate that the LSF and MRF systems together accumulate 4–5 mm/yr of reverse‐slip deficit, although their separate slip rates cannot be determined independently. We then use a constrained least‐squares inversion to determine best‐fitting slip rates on the major faults and investigate slip rate trade‐offs between faults. ![]() Click on an arrow at edge or corner of above map to go to an adjacent map. A pair of 3.0 magnitude earthquakes hit Southern California Tuesday night, according to the United States Geological Surve y. Click on an earthquake on the above map for more information. We construct Green’s functions for interseismic slip deficit for discrete faults embedded in an elastic plate overlying a viscoelastic mantle. Recent Earthquakes in California and Nevada. In this work, we analyze a new compilation of interseismic geodetic velocities from Global Navigation Satellite Systems, leveling, and tide gauge data near the MTJ to constrain present‐day slip deficit rates on upper‐plate faults and coupling on the megathrust. However, the geodetic slip rates of these faults are poorly constrained. The wait between earthquakes might be longer than we previously thought because the evidence for older earthquakes isn’t always 100 accurate, McPhillips said. These faults, including the Little Salmon and Mad River fault (LSF and MRF) zones, are located near the most populated parts of California’s north coast and show paleoseismic evidence for three slip events of several‐meter scale in the past 1700 yr. In a new publicatio n, USGS geologist Devin McPhillips studied sites along three faults in California with long histories of earthquakes to better understand what’s happening. The fore‐arc of the southern Cascadia subduction zone (CSZ), north of the Mendocino triple junction (MTJ), is home to a network of Quaternary‐active crustal faults that accumulate strain due to the interaction of the North American, Juan de Fuca (Gorda), and Pacific plates.
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