There were 2 large earthquakes today off the west coast of nothern Sumatra, first an 8.6 then shortly after an 8.2. These earthquakes can cause large tsunamis which can reach Japan, Australia, and many others.
USGS Reports of each earthquake
http://earthquake.usgs.gov/earthquakes/eventpage/usc000905e#summary
http://earthquake.usgs.gov/earthquakes/eventpage/usc00090da#summary
Tsunamis Report from Weather.gov
http://ptwc.weather.gov/ptwc/text.php?id=indian.TSUIOX.2012.04.11.0845
National Data Buoy Center, to watch where the tsunamis are traveling
Everyone be safe and take the proper precautions