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Geological Hazards and Their Impact_McGeary_Date_031010

Geological Hazards and Their Impact_McGeary_Date_031010 -...

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21/03/2010 13:04:00 Earthquake Risk Areas Alaska: Aleutian Subduction zone 1964 - M9.2 (biggest earthquake ever recorded) low population density Oregon/Washington: Cascadia Subduction zone 1700 – M9.0 “locked” megathrust California: San Andreas Fault Transform plate boundary Strike-slip fault North segments, creeping zone, and south segments Western States: very slow continental rifting Nevada, Idaho, Montana, Wyoming, Arizona New Madrid EQ zone 1811-1812: M7 and M8 major earthquakes Missouri, Tennessee, Arkansas East Coast: clusters, rare earthquakes Not too big since Civil War Tsunami - harbor waves : do the most damage to harbor areas
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Unformatted text preview: ← ← Causes: 1) offset of sea floor by earthquakes (thrust faults at subduction zones) 2) landslides/instantaneous displacement of water 3) major volcanic eruptions ←- basically, anything that displaces water (i.e. meteor impact) ← ← Description: ← Normal Waves • No height • 100 m average wave length • travel very slowly (about 50 mph – like a car) ← Tsunami in deep water • 1 m high (or less) • 360 km wave length • 500-600 mph (like a jet) ← Tsunami in shallow water • >1 m high o major: 5-10 m high o great: >10 m high • 360 km wave length • 50-100 mph...
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