Geological Hazards and Their Impact_McGeary_Date_030510

Geological Hazards and Their Impact_McGeary_Date_030510 -...

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Earthquakes - 3 types of seismic waves P wave (primary, arrive first) o Travel the fastest S wave (secondary, arrive second) o Travel the second fastest Surface wave (arrive last) o Slowest o Biggest amplitude o cause the most damage because: biggest, last the longest, most complicated motion - can we predict earthquakes? NO but we can make a forecast and we can prepare or mitigate o forecast: what the size might be, location (segment on fault), probability (chance it will occur), time window o i.e. There is a 63% probability of an earthquake of M7 or above occurring in San Francisco bay area between 1995-2025 - How do you calculate probability and recurrence intervals? 1) map plate boundaries? Active? 2) look at plate tectonic setting o M8 & above
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Unformatted text preview: convergent o M6 & 7 transforms, convergent and divergent 3) records of seismology o Location, timing, size Limited resources- where to invest and what do you d to mitigate? Not a question of if, its a question of how to prepare o Build structures to be earthquake resistant o Have emergency plans - clues where earthquakes might occur seismic gaps- length of fault that we know is active but has not had a major earthquake in a very long time. o It is locked and the stress is building up migrating earthquakes- once seismic gap gets filled in by EQ, use satellites to figure out where all that stress has migrating to, thus, which new area is at greater risk...
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