The world may not be well prepared for the next significant tsunami, reports Northwestern University tsunami expert Emile A. Okal in a new study that includes a "wisdom index" for 17 tsunamis since 2004.
A strong earthquake shook Tokyo early Saturday morning, knocking books from shelves, but authorities said there was no risk of a tsunami.
A 6.6-magnitude quake hit in waters off Indonesia's easternmost province early Friday, injuring dozens of people, damaging buildings and sending panicked residents fleeing from homes, hotels and even a hospital.
Tsunami advisories for Hawaii and California were dropped Thursday following a powerful earthquake off Chile, while minor effects were recorded along coasts as far north as Alaska.
A strong undersea earthquake has struck off eastern Indonesia, but there were no immediate reports of casualties or damage and no tsunami warning was issued.