Washblog || SW WA Heads Up! No Tsunami but quakes more frequent in last few weeks

SW WA Heads Up! No Tsunami but quakes more frequent in last few weeks

By Lietta Ruger
Mon Apr 14, 2008 at 11:17:14 AM PST
Section: Diary Topic: Climate Change

A series of crustal-shallow earthquakes have occurred over the last two weeks off the Oregon Coast. The largest of these quakes range from 5.0 to 5.2 in magnitude, with a depth of 6.2 miles set by program. These quakes lie along a laterally moving fault known as the Blanco Fracture Zone. The Blanco Fracture Zone is an active seismic area located about 225 miles off the Pacific Coast. In this area, segments of the oceans crustal plate are tearing apart by moving in opposite directions to each other.

Although this is a common area of seismicity, the rate at which these moderate size quakes are occurring in the last few weeks appears more frequent than usual. It is important to note that these shallow or crustal quakes are not directly associated with the Cascadia Subduction Zone, which is capable of producing a magnitude 9.0 earthquake. The Subduction Zone fault is located further east, just off the Pacific Coast

There have been no reports of damage or tsunami as a result of these events. RX Watch continues to coordinated situational awareness with Regional Hazard Mitigation staff, the USGS, and that Oregon State Emergency Management.

Graphic:
The above graphic illustrates the Blanco Fracture Zone in comparison to the Cascadia Subduction Zone.

The Subduction Zone is indicated in RED. The Subduction is located further east off the Pacific Coast.

(note; the information is from an email I received this morning from Stephanie Fritts of Pacific County Communications and Emergency Management; PO Box 27, South Bend, WA 98586, (360) 875-9340 work, (360) 783-2911 cell )

Note; We need a Doppler Radar to cover SW Washington. Senator Cantwell did hold a meeting March 6, in Grays Harbor with the relevant agencies to discuss viability of obtaining Doppler Radar for SW Washington. I attended the meeting, and haven't written up a report from my notes. Guess I better backtrack and consult my notes and write a report.

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