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What is It
Geologic processes and hazards are events which occur irregularly in time and
space and cause negative impact on man and the environment. Earthquakes,
volcanic eruptions, tsunamis (tidal waves), and landslides are the geologic hazards.
SIMPLIFIED CLASSIFICATION OF MAJOR GEOLOGIC HAZARDS
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 Eruption A. Tephra falls and ballistic projectiles
B. Pyroclastic phenomena
C. Lahars (mud flows) and floods
D. Lava flows and domes
E. Poisonous gases.