Lecture 10 Notes 9.21 - GS1004 Spotila 21 September 2016 Lecture 10 Consequences of Tectonics Earthquakes II Relevant reading Chp 8 p 244-279 Motivating

Lecture 10 Notes 9.21 - GS1004 Spotila 21 September 2016...

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GS1004 Spotila 21 September, 2016 Lecture 10: Consequences of Tectonics: Earthquakes II Relevant reading: Chp. 8, p. 244-279. Motivating questions: Can earthquakes be predicted? What controls the hazards of earthquakes? What does earthquake damage depend on? Damage (and thus hazard) depends on (#1): the distance from the earthquake. Amplitude of waves decreases exponentially with distance. A M6 directly underfoot is worse than a M7 100 km away. Damage is highest within a few km of fault. Shaking is most intense within ~10 km of fault. Damage also depends on (#2): the local response of the ground to shaking. Loose, wet sediment (basins) amplifies surface waves; bedrock is safer. e.g. Anchorage, AK 1964, M9.3 Liquefaction - water saturated sediment loses its strength when shaken, causing load above to shift and sink. Damage depends on (#3): building construction, In several ways: a) Material, style of building b) Technology, engineering, code
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GS1004 Spotila 21 September, 2016 c) adherence to code (economy)
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  • Spring '08
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  • San Andreas Fault, M6 directly underfoot, metal skeletal structures, poor building construction, good building codes

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