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15 Cards in this Set
- Front
- Back
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Intensity
Magnitude an increase of 1 on Richter scale? |
Intensity is the effects of EQ at any given location
Magnitude is the amount of energy/ strength - richter scale 1 magnitude up is 10x more ground shaking and 30x more energy |
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Effects of earth quakes
Ground shaking-- Base Shear Resonance |
Base shear is the ground moving under a building causing base to shear ***L waves are responsible
Resonance is the vibration of an object during EQ due to the wave being in synch with buildings period of motion |
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EarthQuakes
Ground materials affects? |
softer the material the slower the waves and more vibration
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Liquefaction of normal ground
kinda of packing? |
Cubic Packing- sand grains touch 4 different times like a cube - more pore space more liquefaction
Hexagonal packing- sand grains touch 6 times |
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Dilation
how can it be monitored |
expansion caused by stress
1. measure ground tilt 2. measure electrical conductivity 3. measure radon levels |
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Fires from EQ?
landsides too |
yokohama japan - 143k deaths
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Tsunamis
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EQ in ocean - only produced by vertical motion - dip slip Faults
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Interplate EQ's
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last 100s years
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Libson Portugal- Fires and Tsunami
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Intraplate EQ - 3 occurred in 2 hours
9.0 1755 |
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New Madrid, Missouri
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Intraplate EQ * 3 of the largest earth quakes recoded in NA
produced new lake and water falls on Mississippi 1811 |
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San Fransisco
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1906 - Transform plate boundary
FIRes 8.3 |
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alaska 1964
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Above a subduction zone so Convergent Boundary
9.2 Most violent EQ Strongest Crustal Deformation *** led to landslides |
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Haicheng China "peoples war on earthquakes" 1975
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Premier of China
Town was evacuated saved lives **** First EQ to be predicted over short term! |
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CaLI Earthquakes
Loma Prieta 1989 |
Transorm Fault Boundary - Santa Cruz
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Landers/Big Bear 1992
**Northeidge |
** blind thrust fault
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