Would a Major Earthquake Sink Portland in Liquefied Soil?

Aired: 4/12/2012 | 0:06:02 | Clip
Though the impact of Wednesday's 5.9-magnitude earthquake off Oregon's coast was minimal, a lesser-known risk of temblors -- a phenomenon called liquefaction where sandy soil turns to liquid and loses its ability to support weight -- has some scientists worried. Tom Bearden reports what's being done to prepare for a major quake.