A 6.0 magnitude earthquake that rattled Napa and surrounding communities early Sunday morning (Aug. 24, 2014) was the largest to hit the Bay Area since the devastating 6.9 Loma Prieta quake in 1989. The South Napa Earthquake, as it’s being called, struck at 3:20 a.m., causing significant damage and injuries in the immediate vicinity and waking folks up as far south as Salinas and as far north as Ukiah.

Mouse over this USGS earthquake map to see the names of the fault lines (in red) nearest you. Zoom in and click on the South Napa quake for more specific location data and to view a map showing the quake’s geographical intensity range. Zoom out to see the locations and sizes of other recent earthquakes around the world. View a full-screen version of the map here.


As of Monday morning, a day after the quake, USGS scientists still hadn’t confirmed the specific fault line where the South Napa quake occurred, although the likeliest culprit is the Browns Valley section of the West Napa fault, one of the many fault lines comprising the sprawling San Andreas Fault system.

For more on the science of earthquakes, check out KQED’s free e-book.

  • PJBOODT

    Why does it NOT show the Michigan fault line?? We’ve had 2 quakes in less than 2 months. The USGS said it was a new fault line.

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