An earthquake occurred off the coast of the Alaska Peninsula on July 28, 2021, at 10:15 p.m. local time. The large megathrust earthquake had a moment magnitude of 8.2–8.3. A tsunami warning was issued by the National Oceanic and Atmospheric Administration (NOAA) but later cancelled. The mainshock was followed by a number of aftershocks, including three that were of magnitude 5.9, 6.9, and 6.9. Magnitude 7.8 (mww), 28 km deep, 2020 Perryville, Alaska Earthquake — 55.07°N, 158.60°W. July 22, 2020 at 06:12 UTC. Tsunami: USGS flags this quake as having caused one, or the potential for one. Felt reports to USGS: 195. Wiki link https://earthquake.usgs.gov/earthquakes/eventpage/us7000asvb Data: US Geological Survey (public domain).