lecture 14-earthquake basics
Terms
undefined, object
copy deck
- damage hazards
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soft first floor(house on stilts-garage)
Bay area-flat =bay fill= un-stabel
soil- bedrock best
unconsolidated amplifies shaking
liquefication- ground becomes liquid-things sink
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actual point of rupture =
surface above rupture = -
hypocenter
epicenter -
Richter Magnitude
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based on height
of amplitude and distance - ruptures send out waves...
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Fault types what is a fault?
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definition: a fault is any crack which offsets rock
small offset (mm)
large offset (km) - 3. topography changes
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- Reverse fault
- hanging wall hanging wall moves up
- 2. offset of streams
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Normal fault
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hanging wall hanging wall
moves down -
1. offset of strata
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different rock types
juxtaposed
folding, deformation
common near faults - Strike- Slip faults
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movement primarily side-to-side, not up-down
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Recognition of Faults-- 5 Ways
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1. Offset of strata
2. Offset of streams
3. Topography
4. Offset of manmade features
5. Surface water