Natural disasters are caused by nature, including: storms, sea level rise; strong winds on the sea; tropical low pressure; heavy rain, flood; cyclone, lighting, hail; mist, white frost, damaging cold; salt-water intrusion; drought, heat; earthquake; tsunami; land subsidence; other disasters.
Damage caused by natural disasters is destruction or damage at different levels in term of human and materials, and at the same time adversely affects ecological environment which occurred during or immediately after natural disasters. Human losses include death toll, number of missing persons and number of injured people. Material losses are estimated in VND at the time of disaster occurrence.