Magnitude 4.3 Earthquake Strikes Off NorCal Coast

EUREKA (CBS SF) -- A earthquake registering a preliminary magnitude of 4.3 struck off the coast of Eureka, California, according to the U.S. Geological Survey's automated seismograph alert network.

The quake struck an estimated depth of 6 miles below the earth's surface at approximately 6:40 p.m. Deeper quakes are less noticeable while a shallow quake--in the 0 to 40 mile depth range--can feel much stronger than their actual reported magnitude. Quakes just below the earth's surface, in the 0 to 10 miles range, can cause even more damage at lower magnitudes.

COMPLETE QUAKE COVERAGE: CBS Earthquake Resource Center

This article will be updated as information warrants, and follow KPIX 5 on Twitter at @CBSSF or KCBS Radio on Twitter at @KCBSNews for updates on breaking news anytime.

DID YOU FEEL IT?: USGS Shake Map For Northern California
LIVE QUAKE MAP: Track Real-Time Hot Spots
BAY AREA FAULTS: Interactive Map Of Local Faults

Strong earthquakes with an epicenter off the coast can trigger tsunamis, depending on the size and type of the fault movement. The Pacific Tsunami Warning Center tracks earthquake data for the West Coast.
WEST COAST TSUNAMI TRACKING:

In:
• Earthquakes
• Earthquake