A natural disaster is a major adverse event resulting from natural processes of the earth; example include floods, volcanic eruptions,earthquakes,tsunamis, and other geologic processes. A natural disaster can cause loss of life or property damage, and typically leaves some economic damage in its wake, the serverity of which depends on the affected population's resilience,or ability to recover.An adverse event will not rise to the level of a disaster if it occurs in an area without vulnerable population. in a vulnerable area, however, such as san francisco, an earthquake can have disastrous consequences and leave lasting damage, requiring years to repair.