In April, a powerful earthquake shook Sumatra, an island in the
Indian Ocean that’s part of the country of Indonesia. Two hours later, a
second earthquake — one nearly as powerful — hit the same region. This
one-two punch had a big reach: It set off additional quakes as far away
as Mexico.
The Sumatra earthquakes occurred near where a 2004
earthquake struck and caused a tsunami that killed hundreds of thousands
of people. Big quakes also hit the area in 2005 and 2007. Scientists
now suspect that all of the earthquakes there don’t only add up to a lot
of shaking — those powerful tremors also indicate something may be
changing deep underground.
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