Another earthquake was felt across the Humboldt Bay area, and theUSGS says that it's a 4.6M (downgraded from 4.7). Presently there is NO tsunami warning in effect. The Redwood Coast Tsunami Work Group says that a followup 3.0M event is an aftershock.
| Magnitude |  | 4.6 - moment magnitude (Mw) |
| Time | | Thursday, March 22, 2018 at 8:09:39 PM (PDT) Friday, March 23, 2018 at 3:09:39 (UTC) |
| Distance from | | Ferndale, CA - 24 km (15 miles) SW (233 degrees) Rio Dell, CA - 33 km (20 miles) W (260 degrees) Fortuna, CA - 33 km (20 miles) WSW (239 degrees) Hydesville, CA - 35 km (22 miles) WSW (252 degrees) Humboldt Hill, CA - 40 km (25 miles) SW (220 degrees) |
| Coordinates | | 40 deg. 26.9 min. N (40.448N), 124 deg. 29.4 min. W (124.491W) |
| Depth | | 20.97 km (13.0 miles) |
