'Is this an earthquake?'

A slew of onlookers stopped and observed a window on Market Street in downtown Philadelphia that was cracked during Tuesday's 5.8-magnitude earthquake that shook the East Coast from Georgia to New England. (Associated Press)

A slew of onlookers stopped and observed a window on Market Street in downtown Philadelphia that was cracked during Tuesday's 5.8-magnitude earthquake that shook the East Coast from Georgia to New England. (Associated Press)

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