UPDATE: Major 8.2 Earthquake Rocks Alaskan Coast; Tsunami Warning Lifted For Northern California
PERRYVILLE, Alaska (CBS SF/AP) -- A warning for large tsunami generated waves slamming into the San Francisco Bay Area coastline was lifted early Thursday morning after a major 8.2 magnitude earthquake and dozens of strong aftershocks rocked the Alaskan coastline.
The major quake struck at about 11:15 p.m. in the Pacific Ocean, 56 miles east southeast of Perryville, Alaska and immediately triggered a tsunami warning for the San Francisco Bay Area.
Thu Jul 29 09:31:40 UTC 2021 event picture pic.twitter.com/4oKtX2ymqt
— NWS Tsunami Alerts (@NWS_NTWC) July 29, 2021
But the alert by the national tsunami center was lifted at around 2:50 a.m.
"US West Coast residents: there will be no further alerts issued for this event. No significant tsunami is expected. Once again, California, Oregon, Washington, British Columbia, Alaska - all clear."
While the alert was lifted, the center did warn that "strong & unusual currents may continue for the next several hours."
Dozens of aftershocks measuring as high as 6.1 in magnitude continued to rumble in through fault zone along the Alaska coast.
According to the U.S. Geological Survey, over the next week there is a chance of one or more aftershocks that are larger than magnitude 8.2. It is likely that there will be hundreds of smaller earthquakes of 3 magnitude or higher aftershocks.
The quake occurred as the result of thrust faulting at shallow depth on the subduction zone interface between the Pacific plate and the North America plate, where the Pacific plate begins subducting to the northwest beneath Alaska.
Large earthquakes in this region are common; the same subduction zone hosted the second largest earthquake recorded on modern instrumentation in March 1964 (M9.2 Alaska earthquake), and in 1938 a M8.2 event occurred in a very similar location to Thursday's earthquake.
Based on the preliminary seismic data, the quake should have been widely felt by almost everyone in the area of the epicenter.
The quake triggered tsunami warning sirens to go off in communities along the Alaskan coast sending residents scrambling for safety.
More video of #tsunami sirens in #Kodiak #Alaska #earthquake pic.twitter.com/X0rDJfXmyc
— SkyQueen (@Triquetra331) July 29, 2021
#Kodiak #Alaska as of 10 minutes ago... sirens and evacuations #earthquake #tsunami pic.twitter.com/BfdjAzqGcj
— SkyQueen (@Triquetra331) July 29, 2021
People evacuating from lower grounds in Seward, Alaska as Taunami warning sirens going off. #alaska #earthquake #Tsunami pic.twitter.com/dPJzyTOI2z
— Blue Waters Camping (@bluewaterscamp) July 29, 2021
8.2 Earthquake is the largest in Alaska since 1965. I was sitting in the upper wheelhouse of my 125' steel schooner ALEUTIAN EXPRESS at Chignik Harbor and the whole boat bounced and vibrated for about a minute. 14' range of gradual Tsunami one foot every 4 minutes both directions pic.twitter.com/IlYox48ejg
— John Clutter (@AleutianExpress) July 29, 2021
Aside from rattled nerves, the temblor may have caused light to moderate damage in the Alaskan communities of Perryville, Chignik Lake and Sandpoint.