Chapter_4 - Introduction to Natural Hazards 1995 Kobe,...

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Introduction to Natural Hazards
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1995 Kobe, Japan $100 billion in damage 5500 people killed Before quake Japan thought it was prepared for such an event
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A high magnitude earthquake caused enormous damage
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A killer cyclone that devastated Bangladesh a country with dense population and poor construction – 145,000 deaths
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Natural Processes as Hazards Since the 80’s natural disasters have killed millions of people and caused billions in damages – Natural processes have always existed • Hurricanes, earthquakes, volcanoes, tsunamis, landslides, floods
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What makes natural processes hazardous? • Increased populations • Land-use changes – Deforestation and urbanization • Increased occurrence and/or magnitude – Landslides and flooding
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Job of Environmental Geologists Identification of natural hazards Help land-use planners avoid or minimize the impact on human live and property
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The Impact of Hazards Dependant on magnitude and frequency of events – Other factors controlling impact • Population, geology, climate, vegetation, land use Frequency is inversely related to magnitude Large events occur less often and smaller events occur more often
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Benefits of Hazards • River flooding – Carries valuable nutrients downstream – Erodes mountains carrying sediments to beaches
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Benefits of Hazards • Landslides – Form dams in mountain streams forming lakes
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Benefits of Hazards • Volcanic eruptions – Creation of new land (Kilauea volcano) – Nutrient rich volcanic ash
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Benefits of Hazards Earthquakes Mountain building
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What makes a catastrophe? • Damage to people, property, and/or society
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Chapter_4 - Introduction to Natural Hazards 1995 Kobe,...

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