Science Chile earthquake: Is the 8.2 temblor only a foreshock?

While Tuesday's earthquake in Chile was large by any measure, seismologists remain concerned it could have been a foreshock to a much larger quake in this region – a section of plate boundary that hasn't seen a major rupture in 137 years.

Hector Merida/Reuters

Chilean officials are assessing the damage after a magnitude-8.2 earthquake struck the country's north coast Tuesday night, leaving at least six people dead, triggering landslides and fires, and cutting off electricity to thousands of residents.