"tens of millions of years"
And your data to support that supposition is .....????
Well, the Pacific in roughly this configuration we see today with similar subduction zones and faults has been around for tens of millions of years.
Earthquake activity in 2004 was basically completely normal, even a bit below normal for major quakes, and most world quakes are always in the Pacific rim.
Hence, it's a pretty safe assumption that this year's Pacific Rim quake activity has been going on for tens of millions of years.