Please see some of the following links at:
http://www.ngdc.noaa.gov/hazard/earthqk.shtml
http://earthquake.usgs.gov
http://neic.usgs.gov (USGS National Earthquake Information Center
http://geology.usgs.gov
http://earthquake.usgs.gov/research/hazmaps/  (USGS National Seismic Hazard Maps)  

 
The answer to the question about which country gets the most earthquakes is answered by the U.S. Geological Survey at http://earthquake.usgs.gov/learn/faq/?categoryID=11&faqID=139