The earthquake was the worst to strike the Sichuan area in over 30 years. Following the quake, experts and the general public sought information on whether or not the earthquake could have been predicted in advance, and whether or not studying statistics related to the quake could result in better prediction of earthquakes in the future. Earthquake prediction is not yet established science; there was no consensus within the scientific community that earthquake "prediction" is possible.
How long had it been since an earthquake of similar magnitude?
over 30 years