Alaska is the most earthquake-prone state. Here is why.
Juneau, Alaska – The earthquake on Wednesday 7.3 Wednesday off the Alaska Alasska islands chain struck in a region that has experienced a handful of powerful earthquakes in the past five years – including one that shook communities almost exactly two years earlier.
The officials said Thursday that they had not received any major injury or damage report from the last event, which sparked a warning from Tsunami which lasted about an hour before being demoted and prompted the communities along a 700 -mile expanse (1,127 km) from the southern coast of Alaska to exhort people to move towards higher land. The maximum official height of the waves at Sand Point, a community of 55 miles (88 kilometers) north of the epicenter, was around 3.9 inches (10 centimeters), said Kara Sterling, scientist in service at the National Tsunami Warning Center. It occurred at low tide.
The earthquake struck at 12:37 p.m. local time causing the Center tsunami warning.
There are several ways in which people in warning areas can receive notifications, including the sound of sirens in the communities that have them, listening to meteorological radio or public radio emissions, by following official accounts on social networks or via push alerts on mobile phones. In some places, local officials have relayed door warnings, said Jeremy Zidek, spokesperson for the state emergency management division.
Public security services in King Cove and Unalaska have sent alerts urging those in coastal areas or those that may see floods to search for higher land.
The warning issued by the Center was demoted to a notice before being canceled around 2:45 p.m.
Alaska is the most subject to earthquakes in the United States and one of the most active regions seismically active, according to US Geological Survey. The state is experiencing an earthquake of magnitude 7 almost annually, and the second largest earthquake ever recorded was centered at around 75 miles (120 kilometers) east of anchorage, the agency said. This 264 earthquake of magnitude 9.2 – and the tsunami which he triggered – killed around 130 people.
The Aleutian arc is no stranger to earthquakes, but activity in the region where Wednesday’s earthquake has attracted the attention of scientists. The area, a few hundred kilometers from the earthquake, has “lit up” on Wednesday’s earthquake marking the fifth out of 2020 since 2020 since 2020 since 2020, said state seismologist Michael West.
“I wouldn’t call that an isolated earthquake. It seems to be part of a larger sequence covering the last years,” he said. But West added: “There is no reason to be alarmist on this subject.”
Some communities have buildings designated on higher land as a meeting point during tsunami warnings, such as a school, while others could simply exhort residents to withdraw from a hill, Zidek said.
“This region of Alaska, most regions of Alaska, it becomes very fast,” he said.
Sometimes the only warning that we could have is the trembling floor, said Zidek. “If he is shaking violently for 20 seconds or more, it is your warning panel, and you should go to higher land if you are in a coastal area,” he said.
Zidek and West said people should continue to take account of warnings. West said that he was worried about a “professional exhaustion” among residents of the region, some of which have evacuated several times since 2018 in response to larger earthquakes that have not caused significant damage.
West said that he remembers an earthquake of magnitude 8.6 in 1946 – west of the location of the earthquake on Wednesday – which generated a deadly tsunami and led to the creation of an American tsunami warning system. The number of deaths included more than 150 people in Hawaii, according to the National Oceanic and Atmospheric Administration.
“This area is capable of trans-Pacific tsunamis, and I perhaps feel that the best way to remain vigilant … maybe is to look at our history deeper beyond the last five years,” he said.
