The most devastating types that have done the most damage are Megathrust variety. (usually 9.0 or larger) They create the closest wave frequency which does the most structural damage and creates the largest Tsunami's. (Not to be confused by landslide events like Lituya Bay.)
The 1964 Alaska Quake was so devastating because it was was a Subducted (Ocean floor) Megathrust of over 9.2. This explains the less than spectacular Tsunami hype that hit Hawaii last weekend.
Since I am a neophyte, I can get away with the liberty of ponderance and right now I using it liberally so:
The last few weeks, I have, not obsessively so but close, have been monitoring each and every swarm, and quake(even the swarm occurring in the north sea).
It was obvious to me that we were seeing much more in the way of major plate tremors than normal. Normal being the last few years because I believe that anything happening now is not out of the overall norm.
Anyways, once the California swarms in the LA area and the increase in quakes near Geysers California. The fact that Yellowstone had just ended it's most prolific one month period of quake action was also weighed heavily.
My thinking is that the tectonic Plates are moving at increase rates and this makes for some rather interesting times.
If you look at the major plate contact areas, to me the only ones that is ripe right now, not only because of the time interval between release but because of the motions involved, were the Cocos and the San Juan Fuca Plate.
Now the San Juan Fuca plate just experienced a large quake in January but it was more centered in an area called the Gorda plate which is at the southern extension of the Fuca and Cascadia zones.
Secondly that quake was a slip quake and not a subduction zone Mega-Thrust.
Given all of that and the historical nature of the CSZ, I would be very inclined to believe it has yet to react to this latest increase in Tectonic Plate movement.
That's where my thinking is at. Again from a very low-level armchair...lol