Foreshocks can occur minutes to days or even longer before the main shock.
From Wiki: The 2002 Sumatra earthquake is regarded as a foreshock of the 2004 Indian Ocean earthquake with a delay of more than two years between the two events.
722 posted on 08/23/2011 12:19:47 PM PDT by dragnet2
(Diversion and evasion are tools of deceit)