Land-Level Changes Produced by the Mw 8.8 2010 Chilean Earthquake

The 2010 Mw 8.8 Chilean earthquake ruptured ~500 kilometers and vertically displaced over 3 meters. We observed vertically displaced coastal and river markers after the 27 February 2010 Chilean earthquake [moment magnitude (Mw) 8.8]. Land-level changes range between 2.5 and –1 meters, evident along an ~500-kilometers-long segment identified here as the maximum length of coseismic rupture. A hinge line located 120 kilometers from the trench separates uplifted areas, to the west, from subsided regions. A simple elastic dislocation model fits these observations well; model parameters give a similar seismic moment to seismological estimates and suggest that most of the plate convergence since the 1835 great earthquake was elastically stored and then released during this event.