Geohazards" are events caused by geological features and processes that present severe threats to humans, property and the natural and built environment. Earthquakes floods landslides volcanoes avalanches and tsunamis are typical examples of such events. Landslides caused by heavy rainfall flood, earthquake erosion human activities are the most common geohazards on land. On land and offshore geological processes, earthquakes and human activities, for instance in connection with offshore petroleum exploration and production, can trigger slides and large mass flows. In terms of number of fatalities, earthquakes and floods are often considered the most important geohazards, although much of the damage is caused .
the relationships between those risks our ability to deal with them. The need is accentuated by increased sliding and flooding in many regions, increased concern for geohazards in production and transport of oil and gas and increased vulnerability of major urban areas to earthquakes because no regard to proper construction of residential buildings and land use planning.