Would a Major Earthquake Sink Portland in Liquefied Soil?
Clip: 04/12/2012 | 6m 2s
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.
Aired: 04/12/12
