Scientists have been gathering all this week at the Seismological Society of America conference in Pasadena.

Discussions at the meeting on Wednesday centered around the dreaded "big one." According to new research, L.A. could be in not just for one big one - but a series of big ones.

And, scientists are zeroing in on a lesser known fault in Ventura. That fault line poses a larger earthquake, and tsunami, threat than previously thought.

Rick Wilson is a senior engineer geologist with the California Geological Survey, Tsunami Program, and he tells more about the tsunami risk.