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2h ago

Moderate Quake Rattles Bay Area as USGS Downgrades Magnitude to 4.6

USGS warns of likely minor aftershocks over the next week.

A preliminary magnitude 4. 9 earthquake struck near Boulder Creek at 1:41 a.m. April 2. Courtesy U.S. Geological Survey.
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Overview

  • The earthquake recorded at 1:41 a.m. Thursday near Boulder Creek was downgraded from 4.9 to 4.6 by the USGS.
  • Shaking was felt from the Santa Cruz Mountains to San Francisco and the East Bay, with stronger jolts close to the epicenter.
  • Many phones sounded ShakeAlert warnings before the waves arrived, giving some residents a few seconds to brace.
  • CAL FIRE CZU and local fire agencies reported no injuries or damage after building checks, and officials said there was no tsunami threat.
  • The USGS forecast calls for aftershocks this week, including about a 60% chance of a magnitude 3, a 14% chance of a 4, and a 2% chance of a 5.