Dec. 7 quake: larger aftershocks possible
science
2011 quake sparked new study, rethink of seismic theory
Dogs, too, show mental scars from Japan's 2011 disaster
Scientists in groundbreaking study on effects of radiation in Fukushima
Radioactive fallout detected far from Fukushima
Asahi investigation: Quake flashpoints remain poorly identified despite intensive work
Tons of tsunami debris to wash up on N. American coasts