Officials canceled a tsunami watch in California Tuesday after a 7.9-magnitude earthquake rattled parts of Alaska and prompted the warning.
The Tsunami Watch for the California coast has been cancelled. #cawx— NWS Los Angeles (@NWSLosAngeles) January 23, 2018
The powerful earthquake was off the coast of the Last Frontier’s Kodiak Island and shook the surrounding area just before 1:45 a.m. PST, according to the United States Geological Survey. It was recorded an estimated 175 miles southeast of the island.
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Originally, the USGS reported the temblor with an 8.2 magnitude but they downgraded it just after 3 a.m.
As a result of the powerful quake, Oregon, Washington and the California-Mexico border were all under the tsunami watch. As of 4:30 a.m., those warnings were canceled.
The National Weather Service estimated if the tsunami were to hit southwest California, it would have arrived between 6 a.m. to 7 a.m.
Most observed tsunamis in California history have been small, but a magnitude-9.2 quake off Alaska in March 1964 generated powerful waves that slammed coastal areas, including the Northern California community of Crescent City, where 11 people were killed. A surge about 20-feet high flooded nearly 30 city blocks, according to the Department of Conservation.
Quakes in the Alaska Subduction Zone also generated a tsunami in April 1946 that caused flooding about 1,000 feet inland in Half Moon Bay on California's Central Coast.
In March 2011, a magnitude-9.0 earthquake in the Tohoku region of Japan led strong tsunami currents that damaged harbors along California's coast.