Aftershocks.
There were two major aftershocks after the quake.
Reference in News:
"Strong aftershocks can be associated with major temblors, even weeks or years after the main event. But they are primarily felt in the first 24 to 48 hours, and more should be expected."
Fox News"Officials said that the earthquake in Argentina was not an aftershock of the massive 8.8 magnitude quake that struck Chile. It was a separate event."
The Cleveland Leader.
Temblores previos a un terremoto:
Foreshocks.
Reference in News:
"McGuire has also studied foreshocks extensively, a phenomenon in which a smaller quake seems to foreshadow a larger one."
Physorg.com
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