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USGS

This color-coded map shows earthquakes that have been recorded over the previous seven days. The size of the box indicates the quake's strength, and the color indicates how recently the quake occurred. Notable quakes include the cluster of red boxes in Chile, and the blue box indicating a seismic event in Japan.

Chile is on a hotspot of sorts for earthquake activity. And so the 8.8-magnitude temblor that shook the region overnight was not a surprise, historically speaking. Nor was it outside the realm of normal, scientists say, even though it comes on the heels of other major earthquakes.

One scientist, however, says that relative to the time period from the mid-1970s to the mid-1990s, Earth has been more active over the past 15 years or so.