3-10 - Earthquakes Hazards Continued 2008-03-10 Surface...

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Earthquakes – Hazards Continued 16:09 Surface Rupture Movement along fault breaks surface Liquefaction Liquefaction o Involves water saturated soft sandy soils o These behave like liquid during strong ground motion 1989 Loma Prieta EQ-Liqufaction Sand Boil, Oakland Foundation Failure, Marina District of San Francisco 1995 Kobe Japan EQ-Liquefaction Additional Hazard: Fire Not a natural effect of earthquake Broken gas mains, spilled fuel, overturned cooking fires and lamps Fires after 1906 quake are what destroyed most of San Francisco Additional Hazard: Aftershocks Aftershocks threaten rescue workers Stress survivors May cause more damage Earthquakes – Mitigations Ground Motion – Mitigation Identify areas of greatest shaking risk o Requires detailed geological mapping Building codes and retrofits o Shear walls to strengthen “soft stories”
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3-10 - Earthquakes Hazards Continued 2008-03-10 Surface...

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