EAS Lecture 3

EAS Lecture 3 - hours ahead of the earthquake happening...

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Lecture 3 Earthquakes, Earth Structure Bad building cause more damage than the earthquake because not stable. Base isolation reduces the earthquake Liquefaction cause the pressure in pores between grains to increase and turns the substrate into a fluid destabilizes building foundations can cause sand volcanoes or “sand boils” What is a tsunami? Japanese for harbor wave Not really a tidal wave since they are not cause by tides Formed by something that rapidly moves large amounts of ocean water Tsunamis travel about the speed of a jetliner Oceanic earthquakes happen most frequently Landslides: caused by shaking from earthquakes block rivers cutting off water supply Red spots signify a zone where plates started to split and stopped, random Earthquake forecasting: estimates the probability that an earthquake of a certain magnitude will occur technology is not that advanced to have a pinpoint prediction as least a few
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Unformatted text preview: hours ahead of the earthquake happening What can we look at to predict earthquakes in the future? 1) historical records ~200 year : patterns and statistics 2) stress meters along the fault lines 3) seismographs to record foreshock 4) Land displacement 5) ground water levels could shift 6) animals behavior 7) magnetic properties 8) anthropogenic activities 9) radon emissions Two forecast strategies a) find a specific precursor- change in # of earthquakes- slow ground motion- radon emission- electrical resistivity- water chemistry- seismic wave velocity b) forecast a general pattern What things could one use to figure out the composition and structure of the deep earth?-drilling -fossil fuels (very surface structures) -sonar ground penetrating radar -surface observations-magnetic field -volcanic rocks - composition xenoliths -meteroites...
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EAS Lecture 3 - hours ahead of the earthquake happening...

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