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EARTHSC 2GG3 (199)
Lecture 6

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Department
Earth Sciences
Course
EARTHSC 2GG3
Professor
Sergei Basik
Semester
Fall

Description
Earthquakes Prediction and Mitigation Lecture 6 September 18 2013Only fools charlatans and liars predict earthquakes Charles Richter1 Predicting EarthquakesEarthquake forecasts date and timeare now fairly reliableForeshocks swarms of minor earthquakes may warn of major earthquakes if they announce the onset of fault slippage Foreshocks precede about 30of all earthquakes The problem is that the big earthquakes mostly occur with no foreshocksRise of a few centimeters in the surface elevation above the fault and a rise in background radioactivity in wells before the earthquakes are precursor events Early Warning SystemsLarge earthquake 100 km or more away could be detected in time to give useful warningEarthquake waves travel 4 kms take 25 seconds to travel 100 km
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