Another friendly Washintonian here with an interest in the subduction zone.
Let me link the map that I wish to discuss. Sorry if the full link shows in the thread, its pretty lengthy
EDIT: Drat, the full link didnt work. Basically I zoomed all the way into the 7.7 area and chose 7 days all events.
What I am seeing, is that the main shock happened on the north end of the "tear" but all of the subsequent shocks have moved southwards. If you imagine a sheet that you flip when you are making a bed, and the "wave" that it makes as it rolls along, this is how I envision what is happening to the ground that causes these aftershocks. If you carry that analogy a little further, you can see where that "wave" moving in a southerly direction on the subduction zone, would put ALOT of added stress on the northern edge of the CSZ, which is right where we DONT want it to be.
Also, the strike slip fault that the main shock happened on runs in a E-W direction through the middle of QCI. It happens to bisect the subduction fault, which leads to alot of confusion about the types of quakes in this area. It seems that they have established that this was from the QCI fault, not the subduction fault. But all of the aftershocks appear to be on the subduction fault. The subduction fault runs unbroken all the way to the Aleutians from what I have been able to determine.
Here is a website that might help with the visualization.
Notice how there are ALOT of smaller eq's working down the CZ towards us? And I have been noticing that our CZ area has been very quiet over the past few months....
What are your thoughts?
edit on 11/2/2012 by MoparDanno because: Link no worky right