There is a Tsunami warning in effect for Hawaii and 50 countries in the Pacific.  Here is a good image provided by the West Coast and Alaska Tsunami Warning Center of what to expect and when and where the tsunami could hit. 

Widespread tsunami warnings are currently in effect in these Pacific countries + Hawaii

 CHILE / PERU / ECUADOR / COLOMBIA / ANTARCTICA / PANAMA /
 COSTA RICA / NICARAGUA / PITCAIRN / HONDURAS / EL SALVADOR /
 GUATEMALA / FR. POLYNESIA / MEXICO / COOK ISLANDS / KIRIBATI /
 KERMADEC IS / NIUE / NEW ZEALAND / TONGA / AMERICAN SAMOA /
 SAMOA / JARVIS IS. / WALLIS-FUTUNA / TOKELAU / FIJI /
 AUSTRALIA / HAWAII / PALMYRA IS. / TUVALU / VANUATU /
 HOWLAND-BAKER / NEW CALEDONIA / JOHNSTON IS. / SOLOMON IS. /
 NAURU / MARSHALL IS. / MIDWAY IS. / KOSRAE / PAPUA NEW GUINEA /
 POHNPEI / WAKE IS. / CHUUK / RUSSIA / MARCUS IS. / INDONESIA /
 N. MARIANAS / GUAM / YAP / BELAU / JAPAN / PHILIPPINES /
 CHINESE TAIPEI

You can follow the tsunami news on twitter and get official updates on the tsunami and tsunami warnings from the Pacific Tsunami Warning Center

Want to learn more about tsunamis?  Check out our tsunami videos post here

And here is another of our posts with more tsunami information