A powerful 8.8 magnitude earthquake struck offshore of Chile this morning. Pacific coasts including all Hawaiian Islands are under emergency Tsunami warning. That means get the hell off the beach in those areas or any place near it. Experts indicate there is time for residents near vulnerable shores to proceed quickly but safely and calmly to higher ground:
USGS info page here. NYT has an excellent update page and livestream. See also additional discussion is going on in IndianaDemocrat's recommended diary.
Note that the entire Pacific Rim and all Pacific islands are on watch as a tsunami has begun to form.