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Geological Hazards and Their Impact_McGeary_Date_030310

Geological Hazards and Their Impact_McGeary_Date_030310 -...

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Earthquakes - in general, there is an inverse relationship between the size of a hazard and the frequency of that hazard Plate Tectonic Setting & Earthquake Risk Chile- convergent plate boundary (subduction zone) thrust fault (compression mega thrust) For many years, the fault sticks, from the friction, but it then reaches a certain point of stress ( elastic limit ) at that point, it slips, and u get the fault motion known and stick-slip behavior Nazca Plate converged with South American Plate (80 mm/year) Each earthquake causes the fault to slip about 8 m
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Unformatted text preview: • Recurrence interval is 50-200 years ← ← Sequence of EQ • M6 M8.8 M7 o Biggest EQ (8.8) is called main shock o The one before it foreshock o The one after is aftershock (lets you know how much the fault actually ruptured) About 134 aftershocks for M5 and above ← ← During an EQ, movement on the fault generates seismic waves • P wave (compressional), like a slinky o Fastest of the wave • S wave (more of a snake motion, like a whip) o Slower wave • Surface wave (up and down and side to side) o Biggest amplitude, most damaging...
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