Re: Spokane Earthquake, Inactive Fault Comes Back To Life???
Posted by Don in Hollister on June 28, 2001 at 00:48:05:

Hi Petra. Not quite that far back. There was a quake at Scotts Mills, OR - March 25, 1993 and was Mag. 5.6. The largest earthquake in Oregon's recorded history - but not for long!

The one at Klamath Falls, OR - September 20, 1993 Mags. 6.0 and 5.9 twin main shocks displaced the Scotts Mills (March 1993) earthquake as the largest earthquakes in Oregon's recorded history. Thousands of aftershocks followed the main shocks.

Two of the largest earthquakes in Oregon occurred in 1910 and 1993. The 1910 earthquake was the largest historical shock within the state's boundaries at a magnitude of 6.8, but it occurred too far offshore to cause damage, whereas the damaging 1993 earthquake was the largest historical earthquake beneath the land area of Oregon, with a magnitude of 6.0 at Klamath Falls.

According to the Oregon Department of Geology and Mineral Industries.

“Local earthquakes are most common in the Portland metropolitan area, northern Willamette Valley, and Klamath Falls area and may threaten the coast from Coos Bay south to Brookings. We simply do not know about the risk of local earthquakes in most other parts of Western Oregon. All of Oregon west of the Cascades is at risk from subduction-zone earthquakes. The amount of earthquake damage at any place will depend on its distance from the epicenter, local soil conditions, and types of construction.”

“To date, no fault in western Oregon has been proven to be likely to move in an earthquake. Although many faults have been identified, we simply cannot say whether being near a fault is any more hazardous than being far from one.” Take Care…Don in creepy town.