sorry to say, the recent Sumatra quake is only a
'medium-size' loss of life.
Here is info on some greater disasters.http://mnw.eas.slu.edu/hazards.html
http://books.guardian.co.uk/firstchapters/story/0,6761,673878,00.html
http://www.arthurhu.com/index/genocide.htm
http://www.maxeiner-miersch.de/life_on_a_risky_planet_e.htm