EPS 20 L10

EPS 20 L10 - What is an earthquake? the release of built-up...

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1 Building up to an earthquake Building up to an earthquake Reading: Bolt Ch 4 p79-101 Building up to an earthquake What is an earthquake? …the release of built-up stress along faults 1. Stress builds up due as tectonic plates move past one another 2. Friction along the fault prevents slip, elastic deformation instead 3. Stress exceeds rupture strength, fault slips … earthquake ± Elastic rebound theory: developed by Reid in the Lawson Report Building up to an earthquake Geodetic surveying The origin of elastic rebound theory Mt Diablo Mt Tamalpais San Bruno Mountain Triangulation: measuring angles between peaks Trilateration: measuring distances between peaks Leveling: measuring vertical distances Building up to an earthquake Trilateration Total deformation south of the Bay Area: 1959-1970 Building up to an earthquake Global positioning system GPS 24 satellites continually orbiting the earth Originally developed for use by the military made available to civilians in 1980s Handheld devices Accuracy of several meters Cost: $100 Obtaining your location: trilateration Three satellite signals provide latitude, longitude
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EPS 20 L10 - What is an earthquake? the release of built-up...

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