Abstract
We showed that the rupture produced by the great Peru earthquake (moment
magnitude 8.4) on 23 June 2001 propagated for \~70 kilometers before
encountering a 6000-square-kilometer area of fault that acted as
a barrier. The rupture continued around this barrier, which remained
unbroken for \~30 seconds and then began to break when the main
rupture front was \~200 kilometers from the epicenter. The barrier
had relatively low rupture speed, slip, and aftershock density as
compared to its surroundings, and the time of the main energy release
in the earthquake coincided with the barrier's rupture. We associate
this barrier with a fracture zone feature on the subducting oceanic
plate.
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