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Series of earthquakes strikes off Oregon coast; no tsunami threat

Jun 3, 2015 SALEM, Ore. (AP) - A series of earthquakes have struck off the Oregon coast but scientists say they

Series of earthquakes strikes off Oregon coast; no tsunami threat

 
Series of earthquakes strikes off Oregon coast; no tsunami threat»PLAY VIDEOUSGS map shows the earthquakes' locations.

SALEM, Ore. (AP) - A series of earthquakes have struck off the Oregon coast but scientists say they weren't strong enough to trigger tsunamis.

The first one measured a magnitude 5.8. It struck about midnight Sunday and was followed by three quakes early Monday. They were of magnitude 4.3, 5 and 4.4.

Then the strongest quake in the swarm hit just after 1 p.m., measuring 5.9, according to the USGS. Two more hit Monday night in the same area as the others. Those were magnitudes 3.9 and 4.2.

They struck along the Blanco Fracture Zone, a fault nearly 300 miles west of Coos Bay, Oregon. They were relatively shallow, at 6 miles deep.

Scientists at the U.S. Geological Survey said it usually takes an earthquake of magnitude 7 or better to trigger a tsunami.

They say the fault that produced them generates frequent earthquakes, but it isn't the type of fault that produces the most violent quakes. The more violent quakes come from the Cascadia Subduction Zone along the coast.

 

Interim State Geologist Ian Madin tells KATU, "The Cascadia Subduction Zone can make a magnitude 9 that is originating directly beneath your feet if you're on the coast. And everybody in Oregon, and Washington and California and Idaho and lots of people in Montana are going to know when that earthquake happens."

A quake of that magnitude would create a tsunami and damage similar to that of the 2011 Japan quake. This cluster of quakes today is a reminder that the area is active and we should be thinking about the potential for a major quake says Madin, "It's absolutely inevitable that it will happen again, we really can't predict when it's going to happen, but the odds are high enough that we have to start getting prepared, because we are woefully unprepared."

The American Red Cross has a list of tips that you can use to help you and your family prepare.

Source: http://www.katu.com/news/local/305762251.html

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