natural hazards, 2eevansforensics.pbworks.com/f/nh01_ch01_lecture.pdf · understanding of the...
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Natural Hazards, 1e
Introduction to Natural Hazards
Chapter 1
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Learning ObjectivesKnow the difference between a disaster and a catastrophe
Know the components and processes of the geologic cycle
Understand the scientific method
Understand the basics of risk assessment
Recognize that natural hazards that cause disasters are generally high-energy events caused by natural Earth processes
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Learning Objectives, cont.
Understand the concept that the magnitude of a hazardous event is inversely related to its frequency
Understand how natural hazards may be linked to one another and to the physical environment
Recognize that increasing human population and poor land-use changes compound the effects of natural hazards and can turn disasters into catastrophes
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Processes & Natural Hazards
Internal forces within EarthPlate tectonics
Result of internal energy of the earth
External forces on Earth’s surfaceAtmospheric effects
Energy from the sun
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Some Important Definitions
HazardNaturally occurringEffects on human interests
DisasterEffect of hazard on society
Property damage, injury, loss of life
CatastropheMassive disaster
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6Figure 1.4
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Natural Hazards & Catastrophes
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History & Natural Hazards
Natural hazards are repetitive.
History of an area gives clues to potential hazards.Maps, historical accounts, climate, and weather data
Rock types, faults, folds, soil composition
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Plate Tectonics
Explains the dynamic processes of the earth’s surface
Due to internal energy of the earth
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Earth’s Internal Structure
Inner core is extremely hot and solid.
Asthenosphere (upper mantle) is composed of solid, hot magma with some flow.
Lithosphere is a thin and brittle crust.
Figure 1.7b
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Plate Tectonics, cont.
Lithosphere is broken into plates that slip on the asthenosphere.
Convection currents caused by hot inner core push and pull on plates.
Two types of lithosphereOceanic - dark, denseContinental - light, buoyant
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12Figure 1.9
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Convection and Tectonics
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Plate Boundaries
Dynamic events on the earth’s surface occur when plates move.
Diverge, converge, or slide past each other
Plates are not defined by oceans or continents, but by where the breaks occur.
Where the earthquakes are located
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15Figure 1.8
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Plate Boundary Features
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Divergent Plate Boundaries
Where plates move away from each other
New lithosphere is created here
Divergence between two ocean plates:Causes mid-ocean ridges
Seafloor spreading
Ex: Mid-Atlantic Ridge
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Forming a Divergent Boundary
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Seafloor Spreading and Plate Boundaries
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Seafloor Spreading and Seafloor Magnetization
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Convergent Plate Boundaries
Where plates collide
Collisions with oceanic lithosphere results in: Subduction Zones
More dense ocean plates sink and melt.Melted magma rises to form volcanoes.
Collisions between two continental plates results in: Continental Collision Boundary
Neither plate subducts, instead the plates crunch together.Form large mountains such as Himalayas.
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Tectonic Settings and Volcanic Activity
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Transform Boundary
Plates slide past one another
Mostly occur in the ocean
Ex.: San Andreas Fault
Separates the Pacific from the North American plate
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Motion at Transform Boundaries
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Motion at Plate Boundaries
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Hot Spots
Not related to plate boundaries
Spot on Earth where magma rises up from deep in the mantle
Magma causes volcanoes to form.
Ex.: Yellowstone Park and Hawaiian Islands
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Hot Spot Volcano Tracks
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Rock Cycle
Different rocks are formed by different processes.
Rock types in a location give clues to geological past and present.
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29Figure 1.12
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Hydrologic Cycle
Solar energy drives movement of water between atmosphere and oceans and continents.
Figure 1.13
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Hydrologic Cycle
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Biogeochemical Cycle
Combines the three previous cycles.
Transfer of chemical elements through a series of reservoirs.
Many important chemical elements are not well understood.
Carbon, Nitrogen, Phosphorus
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Fundamental Concepts for Understanding Natural Processes as Hazards
1. Hazards are predictable from scientific evaluation.
2. Risk analysis is an important component in our
understanding of the effects of hazardous processes.
3. Linkages exist between different natural hazards as well
as between hazards and the physical environment.
4. Hazardous events that previously produced disasters
are now producing catastrophes.
5. Consequences of hazards can be minimized.
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1. Hazards are Predictable
Basis of science is explanation.
Geologists observe hazardous events and form a possible explanation.
From this explanation, a hypothesis is formed.
Data is taken to test a hypothesis.
This is the basis of the scientific method.
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Hazards are Natural Processes
They are a result of natural forces.
They become hazardous when they interfere with human activity.
These process are NOT within our control.Or maybe should not be
Best solution is preparation.
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Ta
ble
1.3
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Forecast & Prediction
PredictionSpecific date, time, and magnitude of event
ForecastRange of probability for event
Some hazards can be predicted, most can be forecasted.
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Hazard Reduction
Identify the location of probable event
Determine probability of event
Observe precursor events
Forecast or predict event
Warning the public
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Figure 1.14
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2. Risk Assessment
Risk = (probability of event) x (consequences)
Consequences: damages to people, property, economics, etc.
Acceptable risk is the amount of risk that an individual or society is willing to take.
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3. Links
Hazards are linked to each other.Some events may cause others.
Example: Earthquakes and landslides
Hurricanes, Tsunami’s & Flooding
Physical environment is linked to hazards.Example: Some rock types are prone to subsidence.
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4. Disasters are Now Becoming Catastrophes
Concentration of population creates greater loss of life in disaster.
Human population growth puts greater demand on Earth’s resources.
Land use affects magnitude and frequency of events.
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5. Consequences Can Be Minimized
Move from reactive response: Recovery and restoration
To an anticipatory response: Avoiding and adjusting to hazards
Land-use planningBuilding codesInsuranceEvacuationDisaster preparednessArtificial control
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Benefits of Hazards
There are some benefits to hazards.
Examples:Flooding provides nutrients for soil.
Landslides form dams to create lakes.
Volcanoes create new land.
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End
Introduction to Natural Hazards
Chapter 1