The tremors, measuring 3.4 and 2.7 on the Richter scale, occurred five hours apart and reportedly produced no additional damage.
Yesterday’s 6.8-maginitude earthquake shattered windows in Seattle, Washington, and Portland, Oregon, and sent chunks of concrete raining down into the streets. The quake was felt as far away as Salt Lake City.
At least 270 people have been treated for mostly minor injuries. One death has been attributed to the quake; a 66-year-old woman living near Seattle suffered a heart attack.
Officials revised their estimates of the damage, raising the total cost to $2 billion.
Among the cities hit hardest was the state capital, Olympia — just 10 miles from the earthquake’s epicenter. There, the quake cracked the dome of Washington’s state Capitol building.
Washington Governor Gary Locke has declared a state of emergency and President Bush has said he will provide federal assistance to the area.
Despite the damage, Seattle mayor Paul Schell told ABC’s Good Morning America that Seattle would be open for business today.
“I’m very proud of our city and our citizens,” Schell said. “We’re on the road to recovery. All of our infrastructure systems are up.”
Geologists say the quake was caused by movement along a fault caused by the Juan de Fuca plate sliding under the continental U.S.
Yesterday’s tremor was the region’s biggest since a 6.5-magnitude quake hit the area in 1965.