Web edition: October 16, 2012
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.
A. Witze. Intraplate quakes signal tectonic breakup. Science News, Vol. 182, October 20, 2012, p. 5. Available online: [Go to]