NATURAL HAZARDS, MITIGATION, AND ADAPTION

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NATURAL HAZARDS, MITIGATION, AND ADAPTION:

NATURAL HAZARDS, MITIGATION, AND ADAPTION

GEOLOGICAL PROCESSES AND HAZARD:

GEOLOGICAL PROCESSES AND HAZARD A  geologic hazard  is one of several types of adverse  geologic  conditions capable of causing damage or loss of property and life. These hazards  consist of sudden phenomena and slow phenomena:

THE DIFFERENT HAZARDS CAUSED BY GEOLOGICAL PROCESS:

THE DIFFERENT HAZARDS CAUSED BY GEOLOGICAL PROCESS

EARTHQUAKES:

EARTHQUAKES The processes that have formed the earth continually act on or beneath its surface. The movement of plates in the earth's crust and local concentrations of heat are a continuing source of hazards to people and their structures.

THE HAZARDS CAUSED BY EARTHQUAKES:

THE HAZARDS CAUSED BY EARTHQUAKES Geologic Event Earthquake Hazards They Cause A . Ground shaking B. Surface faulting C. Landslides and liquefaction 1 . Rock avalanches 2 . Rapid soil flows 3 . Rock falls D. Tsunamis

VOLCANIC ERUPTIONS:

VOLCANIC ERUPTIONS Volcanic eruptions range from gentle outpourings of lava to violent explosions. The difference is determined largely by the viscosity of the magma, or molten rock, and its content of dissolved gas. Fluid magmas, rich in iron and magnesium, tend to allow the volcanic gases to escape and often reach the surface in the form of quiet lava flows. More viscous magmas, rich in silica, tend to trap the volcanic gases, resulting in a build-up of pressure, and thus have a greater propensity to violent eruptions. The ejecta of volcanic explosions include blobs of molten lava, which solidify quickly to form glass, and solid fragments ranging from fine ash to house-size boulders. 

THE HAZARD CAUSED BY VOLCANIC ERUPTIONS:

THE HAZARD CAUSED BY VOLCANIC ERUPTIONS Geologic Event VOLCANIC ERUPTIONS Hazards They Cause A . Tephra falls and ballistic projectiles B. Pyroclastic phenomena C. Lahars (mud flows) and floods D. Lava flows and domes E. Poisonous gases

LANDSLIDES:

LANDSLIDES Landslide hazards occur in many places around What Can You Do If You Live Near Steep Hills? the world and include fast-moving debris flows, slow-moving landslides, and a variety of flows and slides initiating from volcanoes.

TYPES OF LANDSLIDE:

TYPES OF LANDSLIDE Rotational slide Translational slide Block slide Fall Topple Debris flow Debris avalanche Earthflow Creep Lateral Spreads

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