1. 地震 Earthquake
2. 海嘯 Tsunami
3. 火山爆發 Volcanic Eruption
4. 山泥傾瀉 Landslide
5. 山崩 Landslip
6. 水災 Flood or Deluge
7. 早災 Drought
8. 颱風 Typhoon (in Northwestern Pacific) or Hurricane (in the Northeast Pacific Ocean or the Atlantic) or Tropical Cyclone (in Southwest Pacific)
>for more information on the differences between these three names, see
http://en.wikipedia.org/wiki/Tropical_cyclone
9. 龍捲風 Tornado
10. 沙暴 Sandstorm or Duststorm