Chapter 12 earthquakes

Chapter 12 earthquakes - Earthquakes Chapter 12 Tectonics,...

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1 Chapter 12 Tectonics, Earthquakes, and Volcanism Earthquakes Earthquakes Tremendous friction along the transform boundaries Stress Æ Strain (deformation) Once the friction is overcome, the sides along the plate boundaries break loose and move into new positions (cm to km) Energy release: seismic energy into the surrounding crust Radiates through the planet, diminishing with distance Earthquakes Stress Æ Strain (deformation) Æ Rupture (energy release) Earthquakes Some show warning signs while others do not E.g., Liaoning Province of northeastern China Ominous indications of tectonic activity began in 1970 Land uplift and tilting, increasing minor tremors, and changes in the regions magnetic field –after almost 120 yrs quiet Continued for 5 yrs In 1975 – after 3 million people evacuated – the earthquake strike within the predicted time frame – 90% of the buildings fell Earthquakes Some show warning signs while others do not E.g., Tangshan in the northeastern province of Hebei,
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This note was uploaded on 03/25/2008 for the course GEOG 203 taught by Professor Guneralph during the Spring '08 term at Texas A&M.

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Chapter 12 earthquakes - Earthquakes Chapter 12 Tectonics,...

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