[MineralMan]

Here's a graphic for you: Notice that the plate off Oregon and Washington is neither the Pacific or North American plate. The Juan de Fuca plate is the remnant of a larger plate, and is being pushed UNDER the North American plate. It's not really influenced that much by the San Andreas fault system. Subduction is not taking place at this time along the California junction of the Pacific and North American plates. What happens in California has virtually no effect on anything in the Cascades, which is a volcanic zone due to the subduction of the Juan de Fuca plate.

[tubebender]

In 1700 the area of the Triple Junction up into British Columbia ruptured and set off a 9+ R that did much to alter the landscape from Eureka Ca north. They were able to document the event to the minute by studying data in Japan of the resulting Tsunami. I have seen a core sample from Crescent City showing a one inch layer of setiment from the Anchorage quake and tsunami of 64. The same core sample shows a four inch layer from the 1700 event. Further studies show a 9+ event every 300 years in this area.