San Francisco Earthquake 1989 Loma Prieta. What happened? October 17 th 1989 5.04pm 20 seconds...
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Transcript of San Francisco Earthquake 1989 Loma Prieta. What happened? October 17 th 1989 5.04pm 20 seconds...
![Page 1: San Francisco Earthquake 1989 Loma Prieta. What happened? October 17 th 1989 5.04pm 20 seconds duration Magnitude 7 Intensity IX Enormous amounts of damage.](https://reader036.fdocuments.in/reader036/viewer/2022082510/5a4d1b4f7f8b9ab0599a7108/html5/thumbnails/1.jpg)
San Francisco EarthquakeSan Francisco Earthquake19891989
Loma PrietaLoma Prieta
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What happened?What happened?
• October 17th 1989 • 5.04pm• 20 seconds duration• Magnitude 7• Intensity IX• Enormous amounts of damage
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DamagesDamages
• Cost $10 billion– $2 billion in San Francisco
• Damages– 18000 homes– 2500 other buildings
• Destroyed– 963 homes– 147 other buildings
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CasualtiesCasualties
• Over 3700 injuries
• 62 deaths
• 12000 missing
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Catastrophic EventsCatastrophic Events
• Collapse of theInterstate 880
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• Collapse of the San Francisco-Oakland Bay bridge
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• Liquefaction– Building collapse
in Marina District
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• Landslides
• Damage to Epicentre locality
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CauseCause
• San Andreas Fault
– Plate Boundary
– 800 miles across California
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• Unusual San Andreas activity
– Horizontal Slip
– Thrusting• Result 70° dip • to southwest
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Earthquake HistoryEarthquake History
• Long history of earthquakes– First recorded quake in 1769– 1989 quake repeat of 1865– First large earthquake since 1906
• Irregular pattern to earthquakes– Many in one year (e.g. 1971)– Then no significant ones for several years
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PredictionPrediction
• Earthquake was predicted
– Little significant activity
– Several over 5 in last 2 years
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Damage PreventionDamage Prevention
• Earthquake Research
• Improved building design
– Reinforcements– Less rigid– Movement
• Very costly– Cant rebuild whole city
• Research is never complete– Full prevention can
never occur