Overview
- A magnitude 3.9 quake struck near Covelo at 3:05 p.m. on Friday, centered about 7 miles north-northeast of the town at a depth of roughly 6.8 miles, the U.S. Geological Survey said.
- A smaller magnitude 2.7 aftershock was recorded in the same area at 3:33 p.m., showing the short cluster pattern common after local seismic activity.
- Officials reported a stronger magnitude 4.2 event later that evening at about 6:14 p.m., located near the same area with a depth reported around 10.7 miles and accounts of objects shaking in at least one lodging room.
- USGS felt maps show mostly light, brief shaking across the region and there have been no immediate reports of injuries or major structural damage, while local agencies continue to monitor seismic activity.
- The events follow a broader stretch of Northern California seismicity this summer and highlight the role of ShakeAlert and MyShake early-warning systems that were widely used after a June 25 M5.6 near Willits, with seismologists stressing that small clusters do not reliably predict larger quakes.