Sliver Transients!

6 panel postseismic surface deformation

While observing the postseismic recovery of the megathrust and surrounding environment surrounding the Nicoya Peninsula following the 2012 Mw 7.6 earthquake that slipped just landward of the coast, we found something very strange.  The long-lived backarc sliver motion (a presumed rigid block permanent translation) that normally goes at about 11 mm/yr completely stopped for the majority of the afterslip period.  After a little more than a year, we see the motion start up again, however it was inconsistent, and seemed to interplay with the locking behavior with the megathrust, seeming to initiate when megathrust locking starts, but shoot to a maximimum when locking disappears.