Late Tuesday night, a tremendous earthquake struck off the coast of northern Chile, near the town of Iquique. The magnitude 8.2 quake triggered a localized tsunami that battered the coastline with seven-foot waves. The shallow temblor (12.5 miles below the seabed) also set off dozens of aftershocks -- 18 of them above magnitude 5.0 so far, including a magnitude 7.6 aftershock last night. Surprisingly, damage and casualties were very limited. Several fires erupted, smaller structures suffered minimal damage, and six deaths were reported -- the victims were either crushed under debris or suffered fatal heart attacks. Today, Chile's navy cancelled a tsunami alert and its emergency office, Onemi, which had earlier asked residents to evacuate the coastline, said people could return to their homes.