Topic 2 - Earthquakes.pdf

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Department
Earth and Atmospheric Sciences
Course
EAS205
Professor
Solweig Balzer
Semester
Fall

Description
Earthquakes Earthquakes OverviewPart 1 OverviewPart 1Earthquake basics Basic terminologyDistributionSeismic wavesDetection and measurementMagnitude and intensity scalesWhat are Earthquakes What are EarthquakesSudden slippage rupture along fault zones in response to stressSeismic slipCan form new faults or rejuvenate old faultsFound primarily along plate boundaries Stress StressDefined as applied force Horizontal or verticalTypesCompressiveForces pushing directly at each otherTensileForces pulling in opposite directionsShearingForces pushing against each other obliquely Strain StrainResult of applied stressDeformation is the visual expressionCan be permanent plasticOr temporary elasticRuptureT P and Behaviour T P and BehaviourLow T and PNear surface environmentsElasticRuptures are common High T and PUsually at great depths often 100 kmMay involve long term stressPlasticMay rupture
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