More of a question. About subduction zones and earthquakes

I turn to GLP with questions like this cause I know there is someone smart enough to answer them.

So the Earthquake tsunami in Japan was triggered something like this.
Subduction zones are also notorious for producing devastating earthquakes because of the intense geological activity. The introduction of cold oceanic crust into the mantle depresses the local geothermal gradient and causes a larger portion of the earth to deform in a more brittle fashion than it would in a normal geothermal gradient setting. Because earthquakes can only occur when a rock is deforming in a brittle fashion, subduction zones have the potential to create very large earthquakes. If this earthquake occurs under the ocean it has the potential to create tsunamis, such as the earthquake caused by subduction of the Indo-Australian Plate under the Eurasian Plate on December 26, 2004, that devastated the areas around the Indian Ocean. Small tremors that create tiny, unnoticeable tsunamis happen all the time because of the dynamics of the earth.

The more I read about this the more it looks like the USGS has been caught in a lie. They say that a big EQ in Japan has nothing to do with one that hits South America later on but the USGS claims that North America is over due for a big EQ and I want to know if their data is based on subduction zones. So really any help would be nice, I'm just wanting to learn instead of being a doomtard.

EQs are not causes, but results of tectonic plates motion (releases of potential energy); while EQs along the same fault line are interrelated – caused by the same natural phenomenon - they cannot cause each other.

Yes, an EQ shall sooner or later hit the US West Coast "riding" the Pacific Ring of Fire.

[link to en.wikipedia.org]

No I'm asking if one subduction zone in the ring of fire acting up can cause another zone in a different part of the ring to start up. Most of what I've found to read sort of implies that they do.