Geophysicists at ETH Zurich are using models of the lower mantle to identify areas where earthquake waves behave differently ... Is there a lost world beneath the Pacific Ocean?

Rescuers continue to search for a man who was swept out to sea when rough surf hammered the Northern California coast earlier this week even as more powerful waves are hitting the same area again.

The waves, initially projected ... either by something falling into the ocean or by displacing the land underneath. Tsunamis occur globally but are most frequent in the Pacific and Indonesia.