Earthquake intensity measures the impact of an

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Earthquake Intensity Measures the impact of an earthquake event on humans and surface features Many local factors are considered such as local geology, construction practices, population density, and distance to the epicenter Modified Mercalli Intensity Scale is widely used in the United States Intensities are reported as roman numerals ranging from I (for ‘not felt’) to XII, for (‘damage nearly total’)
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Earthquake Damage Ground shaking • Liquefaction • Tsunamis Landslides and ground subsidence • Fire • Aftershocks
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Predication and Forecasting Precursors : uplifted and tilted ground surface, change of seismic-wave velocities, change of electrical resistivity, change of water table, change of radon, animal behavior etc. Prediction : problematic, unreliable – does not work yet in many cases. Forecasting : who knows?
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periodicity?
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Solutions - Zoning (+ support of citizens) - Building codes (+ wise buyers) - Earthquake preparedness (‘Putting down roots in earthquake country)
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Earthquake Awareness Increase public awareness of earthquakes as a hazard Improve public understanding and response to earthquake hazards Building Zones and Building Codes Loma Prieta, 1989, 63 dead, 6-7 billion Kobe Japan, 1995, >5000 dead, >100 billion
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