They compensated for the rarity of megaquakes by widening their focus to events of magnitude 7 and higher. (newscientist.com)
Strain has been building up since the last megaquake, a magnitude 8.8 in 1877. (newscientist.com)
Explore the biggest environment stories of 2011, including: the Japanese megaquake, Earth's ticking time bombs, and the first field tests of geoengineering (newscientist.com)