The 2003 swarm included a magnitude 6.3 earthquake along with 4 other earthquakes that had magnitudes of 5.1 – 6.7. In 2003, a swarm struck within 31 miles of today’s swarm. This isn’t the first earthquake swarm to strike this region in recent times. However, if they become larger, they might cause some increased local waves.” In addition to USGS, the National Weather Service Tsunami Warning Center has also issued their own bulletins on the stronger quakes in the swarms, adding there’s no imminent threat of tsunami at this time.Īccording to USGS, the swarm is located roughly 200 miles west of the Cascadia Subduction Zone and is ongoing along the Blanco Fracture Zone, which is a strike-slip fault system on the edge of the Juan de Fuca plate. USGS says, “Because these quakes are generally small to moderate in magnitude and have a strike-slip focal mechanism (lateral or horizontal motion, not vertical), they are unlikely generate tsunamis. There is no tsunami threat from the Pacific Northwest swarm at this time. More than 70 earthquakes have struck off the Oregon coast since the start of the ongoing earthquake swarm on December 7. The greatest in the entire swarm was a 5.8 thus far. In the first 24 hours of the event, there were more than 55 earthquakes with a magnitude of 3.4 or greater.
#Pacific northwest earthquake series#
The first earthquake in the series was a 4.2 magnitude shaker which struck at 5:20 am local time. These earthquakes are part of a swarm that began two days ago on December 7. Most of the earthquakes in the last 24 hours have ranged in intensity from 3.2 to 5.3 magnitudes. More than 20 earthquakes struck off the coast of Oregon in the last 24 hours, including a 5.2 which struck a short time ago. Scientists are exploring the cause of each new swarm while they are happening at roughly the same time, they do not appear to be related.
While some earthquakes have been moderate, there is no threat of tsunami at this time. Pacific Northwest coast and the eastern Caribbean.
Image: WeatherboyĮarthquake swarms are continuing just off the U.S.
Earthquakes continue to rattle the Pacific Northwest coast and the eastern Caribbean today.
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