More mega-quakes: Coincidence, or cause-and-effect?

"What is clear is that for the 6.2 years since 2004, there have been more great earthquakes around the world than in any 6.2-year period throughout the 110-year history of seismic recordings," says Thorne Lay at the University of California, Santa Cruz. — from a New Scientist article about geologists attempting to find connections between the recent spate of mega-quakes. Important point: There simply may not be a connection. The number of mega-quakes is still so small that this really could just be a coincidence.