Melvin Mosley+FollowLost Plate Fragment Shakes Up Earthquake ScienceJust when we thought we had the San Andreas and Cascadia faults figured out, scientists found a hidden chunk of ancient oceanic plate wedged right at their junction. This “Pioneer Fragment” means the West Coast’s earthquake puzzle is way more complicated than we thought—think five moving pieces, not three. It could even help explain how mega-quakes might ripple from the Pacific Northwest down to California. Our earthquake models just got a major upgrade! #Science #earthquake #SanAndreas10Share