More than 40 quakes were reported off the Oregon coast in just 24 hours on Tuesday, Dec. 7.
The first of the quakes emerged on Tuesday afternoon around 200 to 250 miles away from the coast of Newport, Oregon, according to The Hill.
The greatest of them were up to 5.8 on the Ritcher scale, which occurred twice. In total, there were five tremors of 5 or more magnitude occurring. The National Weather Service said such occurrence was popular in the area. It also dismissed that they would suffice for a tsunami.
The Pacific Northwest Seismic Network (PNSN) added that the earthquakes clustered around the Blanco Fracture Zone. Such natural activities have been too common there that up to 49 earthquakes above magnitude 4.5 would be reported annually.
As PNSN Director Harold Tobin said the series was too far away from the beach to be alarming, he explained further that there have been 91 earthquakes of magnitude 5.0 or more on the Blanco over just the past two decades.
The Hill noted that Oregon is situated at the heart of the Cascadia Subduction Zone. It is a major seismic fault that stretches hundreds of miles off the coast of the United States, King5 reported.
It starts off the coast of California’s Cape Mendocino and travels north through Oregon and Washington before stopping off the shore of Canada’s Vancouver Island.
The place also means that Oregon could someday expect a destructive 9.0+ magnitude earthquake that drags along a 100 feet high tsunami. Such were the same concerns that arose when the swarm of tremors occurred this Tuesday.
But experts and local authorities are much less pessimistic. The Hill noted that they were confident the likelihood of a 7.1+ magnitude scenario was roughly 37%, and that would not be arriving soon until 50 years to come.
Nonetheless, the U.S. still facilitates Oregon with ShakeAlert system that could give people some seconds of alert before an imminent earthquake appears.