Second earthquake swarm in one week hits off Oregon on the Cascadia Subduction Zone


A swarm of earthquakes shook the Cascadia Subduction Zone off of the Oregon coast on Sunday morning shortly after 9:00 a.m., according to U.S. Geological Survey (USGS). The swarm marks the second in just a 5-day span giving fair warning to coastal residents that the Big One could hit anytime.

M5.3 earthquake hits the Cascadia subduction zone off Oregon coast on July 29 2018.

After a string of almost a dozen minor quakes last week, the waters off the southern Oregon coast – approximately 280 miles west of Florence, Oregon – rumbled with yet another M5.3 quake on Sunday morning, at 9:10 a.m. and was followed by a series of 4 aftershocks:

M 5.3 – Off the coast of Oregon
M 3.2 – Off the coast of Oregon
M 3.0 – Off the coast of Oregon
M 3.8 – Off the coast of Oregon
M 4.4 – Off the coast of Oregon

There was no tsunami alert issued, and there are only 10 reports of it being felt on land. The quake was about seven miles beneath the sea floor.

M5.3 earthquake oregon july 29 2018, earthquake swarm oregon coast july 28 2018, second earthquake swarm in 5 days cascadia off oregon coast
This is the second earthquake swarm off the Oregon coast, after a string of 10 quakes happened Tuesday morning.

The swarm marks the second in just a 5-day span giving fair warning to coastal residents who have already been warned as early as 2015 by a Federal Emergency Management Agency (FEMA) official that “everything west of Interstate 5 will be toast” from a mega-tsunami if indeed the big one hits.

Experts fear a mega-tsunami could be headed to the west coast in the near future as the fault is ‘overdue’ for the big one. Residents should remain vigilant.

A string of 10 quakes happened Tuesday morning, mostly about 125 miles west of Gold Beach. The largest was a 5.6 magnitude.

USGS



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1 Comment

  1. Whew! Thank God these smaller quakes are releasing the pressure so the BIG one doesn’t happen. Now the counters have been reset and we have another 100,000 years before the next BIG ONE happens! So, wake me up in 99,999,99 years and I’ll get prepared for the BIG one!

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