Rocks cause ripples

From Ineffable Island: Terri Cook and Kea Giles say, Extra-Terrestrial Impacts May Have Triggered "Bursts" of Plate Tectonics. They're talking the moderate impacts of Middle Archaean.

This goes to my theory that the Chicxulub hit might have "rattled the innards" and allowed swifter tectonics 65-55 mya. Specifically: that it may have softened the asthenosphere. I do notice that the Siberian and Deccan "traps" seem associated with mass-extinctions and with asteroid-sized impacts.

UPDATE 5/27/2020: Backsies on the Deccan.