There are about 20,000 Earth quakes a year, about 2000+ of those are above 5.0 magnitude. Also about a week or two before the 8.9 in japan there was a 7.2 earthquake which was the trigger for the 8.9. As well following the major earthquake there have been several after shock ranging in the 6's and 7's. Some geologist worry that this earthquake might also only be a trigger for another even larger earthquake.
California being close to the San andreas fault is in prime earthquake territory. The major issue there is that the san andreas fault according to geological records is over due for a massive earthquake by about 2500 years, which is referred to as the big one i believe. Although you must understand that earthquake research isn't an accurate science as scientist have failed time and again to accurately predict earthquakes, but are fairly accurately able to predict locations( within 100's of meters) and possible strength.
I don't believe Folrida is in any danger of earthquakes or tsunamis caused by earthquakes. The main danger i believe is intense storms/hurricanes.
Natural disasters are fairly common around the world, its just that japan is a very modern country so this disaster has been endlessly documented. The Tohuku Earthquake/natural disaster has been the most documented earthquake and tsunami to date in world history .
Just don't watch the regular news for pertinent information regarding any natural disasters, if your interested look up information regarding the issue from scientific groups.
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