Central Mexico has been rattled by a moderate 5.2-magnitude aftershock, following a 7.4 temblor earlier in the week, AP reported. The U.S. Geological Survey says the aftershock was centered in southern Guerrero state along the border with neighboring Oaxaca, the same area where Tuesday's quake was centered. U.S.G.S. geophysicist Paul Caruso says aftershocks may occur weeks, months or even years after a large quake like Tuesday's.
