Overview
- USGS recorded the quake near Nikolski at 7:11 p.m. local time on February 22.
- The hypocenter was about 0.6 miles (≈1 km) deep, an extremely shallow depth that can intensify surface shaking.
- Residents reported strong tremors, with no immediate reports of major casualties or significant structural damage.
- The U.S. Tsunami Warning System issued no warning and reported no expected wave threat.
- IRIS confirmed the 6.3 magnitude, and authorities caution that event parameters may be refined as aftershocks are tracked.