Off the coast of Alaska lies the Aleutian subduction zone–a 2,500 mile long convergent plate boundary where the Pacific Plate subducts under the North American Plate at a rate of 6–7 cm/yr. A tsunami warning was rescinded and no large waves were observed because the earthquake took place 32 km beneath the seafloor deep enough that vertical uplift of the seafloor was limited therefore displacing smaller amounts of water. The limited impact from this earthquake was attributed to it occurring offshore from the sparsely-populated Alaska Peninsula. In Perryville, the closest populated area to the quake, cracks appeared in drywalls and on the ground. No casualties or serious damage were reported in the aftermath of the mainshock, as well as some of the strong aftershocks. It was also the strongest earthquake globally since the 2015 Illapel earthquake, tying the 2017 Chiapas earthquake and 2018 Fiji earthquake. This was the largest earthquake in the United States since the 1965 Rat Islands earthquake, and the 7th largest earthquake in US history. The mainshock was followed by a number of aftershocks, including three that were of magnitude 5.9, 6.1 and 6.9 respectively. A tsunami warning was issued by the National Oceanic and Atmospheric Administration (NOAA) but later cancelled. The large megathrust earthquake had a moment magnitude ( M w) of 8.2 according to the United States Geological Survey (USGS). In 1964, southern Alaska experienced the most powerful earthquake known to hit North America - a 9.2 magnitude quake, with an epicenter about 75 miles east of Anchorage.55☂8′26″N 157★5′01″W / 55.474°N 157.917°W / 55.474 -157.917Īn earthquake occurred off the coast of the Alaska Peninsula on July 28, 2021, at 10:15 p.m. And counting the smallest quakes, the state experiences more than 1,000 earthquakes per month. Since 1900, the state has experienced one magnitude 7 to 8 quake every year, and six magnitude 6 to 7 quakes annually, according to the Alaska Seismic Hazards Safety Commission. The Trans Alaska Pipeline System has been shut down in the aftermath of the quake, and crews are assessing possible damage.Īlaska is the most seismically active region of the United States. However, the Federal Aviation Administration says it has issued a ground stop, and it is not clear when flights into Anchorage will resume. While some ramps to the airport are closed, the terminal is open, and flights are arriving and departing, the airport announced on Twitter. dqHGPCv6XO- Heather Hintze November 30, 2018 Evacuated the building after the shaking stopped. This is what happened on the 6th floor of the Nesbett Courthouse during the Anchorage #earthquake. "We continue to feel aftershocks but are lucky to have power." "It seemed like it lasted well over a minute (even accounting for the misperception of time in nightmares)," she tells NPR. Kari Tai, who is visiting Anchorage, was in her brother's house when the earthquake began. It felt like for a minute we might watch that ground open up," Bartley said. "That's the quickest I've ever seen one come on and the hardest I've ever seen it shake. "I've been here 11 years and I've felt movers before, but that scared me s***less," Anchorage resident Kevin Bartley told reporter Nat Herz of Alaska Public Media. The original earthquake powerfully shook Anchorage, the most populous city in Alaska. "People went back inside after the first earthquake struck, but the 5.8 aftershock about five minutes later sent them running back into the streets," The Associated Press reports. It was followed by a series of aftershocks, including one particularly powerful one. #anchorage #alaska #earthquake #weather /d1SaxriGw9- Cassie Schirm November 30, 2018 KTVA’s newsroom felt the blow of the earthquake this morning. The epicenter was about 8 miles north of Anchorage, at a depth of some 25 miles. The earthquake struck just before 8:30 a.m. "Many roads and bridges are closed."Ī tsunami warning was temporarily issued for coastal regions of Cook Inlet and the Southern Kenai Peninsula, but it has since been canceled. Anchorage police report "major infrastructure damage." "Many homes and buildings are damaged," the police department says. Bill Walker has issued a declaration of disaster. Schools were evacuated and parents told to pick up their children - a challenge, in some cases, given the traffic jams that quickly formed across the city.Īlaska Gov. Some roads, bridges and buildings have been damaged, and some businesses shuttered for the day. In Anchorage, Alaska, people took refuge under tables and fled outdoors on Friday morning, as a magnitude 7.0 earthquake struck just north of the city. After an earthquake on Friday, a car is trapped in a crumbled section of an off-ramp from Minnesota Drive, a major road in Anchorage, Alaska.
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