Natural Disaster can be defined as DISTUREBANCE, That results environment changing, caused by natural phenomenon or human activities or both, occurred in short time, unpredictable, and effect to human life. Natural disaster also causes many losses, either material or immaterial.
As mentionde before, there are two main factors that trigger natural disaster : natural and human factors. Natural factor can be caused by two crustal processes, internal (endogen) and external (exogen) processes.
Disaster caused by internal crustal processed are for example earthquake, volcano eruption, etc. Meanwhile flood, drought, tsunami, and tide are examples for disaster which are triggered by external crustal processes. If disaster caused by natural factor are more about natural behavior processes, than disaster caused by human factor are related to human activities that change environment.
The changing will disturb the stability of environment so the environment will also 
react to create the new stability and sometimes it effect to the communities. Based on those, both nature and human can be the object or the subject of disaster. Its means that one can be the trigger and the other can be the victim, or in different case it happens contrary.Indonesia is blessed with diversity of natural resources. In the other hand, as an archipelagos c
ountry, consist of approximately 13,677 island (great and small), with a great number of population that is more than 200 millions, Indonesia has more potential for natural disaster than other countries in this world, especially for sediment -related disaster (debris mass movement). Debris mass movement contents not only sediment material, but also other demolished materials such as drift wood. This kind of disaster may occur in form of lava in volcanic area, land movement (landslide and slope failure) in non-volcanic area, and also tsunami in the coastal area..
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