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    Faster alerts for California megaquakes: Early-warning system gets major upgrade

    LOS ANGELES — California's earthquake early-warning system is getting a seismic upgrade, one that will allow residents to receive more timely alerts about shaking from an incoming megaquake. The upgrade, also available in Oregon and Washington, will provide features important for warnings about the "Big One." The improvements could mean that, depending on where they are and where the quake ...
    by Rong-Gong Lin II, Los Angeles Times Jun 05, 2024 5 minutes
    A damaged home is seen after a 6.4-magnitude earthquake hit in Ridgecrest, California, on July 4, 2019.

    LOS ANGELES — California's earthquake early-warning system is getting a seismic upgrade, one that will allow residents to receive more timely alerts about shaking from an incoming megaquake.

    The upgrade, also available in Oregon and Washington, will provide features important for warnings about the "Big One."

    The improvements could mean that, depending on where they are and where the quake begins, Californians would receive an earlier, more accurate estimate of magnitude before the earth starts shaking — say from a magnitude 7.8 earthquake that begins on the San Andreas fault near the Mexican border and ruptures the fault toward Los Angeles County.

    The upgrade also would improve warnings for the Pacific Northwest and California's North Coast, which are threatened by tsunamis from quakes along the Cascadia subduction zone.

    The U.S. Geological Survey and its nonprofit partner EarthScope announced the upgraded system Wednesday.

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