What magnitude earthquake shook Northern California?

A 4.7-magnitude earthquake shook Northern California.

Where did the earthquake occur?

The earthquake occurred approximately 70 miles offshore, near the Cascadia Subduction Zone.

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California Jolted: Early Quake Warning Issued

Q: What is the ShakeAlert system?

The ShakeAlert system issues early warnings when seismic sensors detect a quake of magnitude 4.5 or higher expected to cause significant shaking.

5 Feb

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Summary

A 4.7-magnitude earthquake shook Northern California early Thursday.
The tremor occurred 70 miles offshore, near the Cascadia Subduction Zone.
Thousands received early earthquake warnings via ShakeAlert.

California Jolted: Early Quake Warning Issued

Early Thursday morning, a 4.7-magnitude earthquake jolted Northern California, triggering widespread ShakeAlert warnings for thousands of residents. The seismic event originated approximately 70 miles offshore, with its epicenter situated near the volatile Cascadia Subduction Zone. This fault system, stretching over 700 miles, poses a significant geological risk.

The tremor, which struck at 4:49 AM PT, was felt in communities such as Chico and Fortuna. The ShakeAlert system, responsible for issuing these crucial early warnings, is activated when seismic sensors detect a quake of magnitude 4.5 or greater that is anticipated to cause substantial shaking.

The USGS data indicates the quake occurred along the Cascadia Subduction Zone, a fault line known for its potential to generate large earthquakes. This zone extends from Northern California up to Vancouver Island, highlighting the extensive seismic reach of this geological feature. Further updates on this developing story are expected.