Magnitude 4.1 Earthquake in Northern California Triggers Quake Alert System


Summary: A magnitude 4.1 earthquake struck Northern California, setting off automated quake alerts and occurring one day before the annual ShakeOut earthquake drill.

On Wednesday, a magnitude 4.1 earthquake rocked part of Northern California, specifically the Isleton area located southwest of Sacramento. The quake set off automated alerts from the ShakeAlert system, which notifies smartphones in areas expected to experience shaking. Although the initial estimate suggested a magnitude 5.7 earthquake, it was later downgraded. Fortunately, there were no immediate reports of harm or damage to the region’s extensive levees. This earthquake occurred just one day before California’s annual statewide ShakeOut earthquake drill and on the anniversary of the 1989 Loma Prieta earthquake that devastated the San Francisco Bay region.

Tags: earthquake, Northern California, quake alert system, ShakeAlert, magnitude 4.1, Isleton