Outline Prelim 1 - 06/03/2008 12:30:00 In Class Review...

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06/03/2008 12:30:00 In Class Review Chapters: 1,2,3,4,11,12,13 Mostly lecture 75% of questions from quizzes Mostly material since first quiz, but know basics of weather Only know earthquakes we’ve gone over in class… San Fransisco 1906 o Earthquake as indirect cause of fire o Earthquake prevented fire extinguishing o Elastic rebound theory : Reid tried to link fault movement to motion o Major earthquake, not a great earthquake : above an 8, S.F. was slightly under 8—7.7 (logarithmic scale, difference between 7.7 and 8 is large) o Right lateral movement, dextral Mexico City 1985 o Site response, occurred just outside Mexico City o Occurred on site of old lake in bowl shaped valley, geometric bullseye o “Poster child” for where not to put a city, has largest population in the world o Intensity : measurement of interest in this case, measures shaking on Mercali Scale o Soft ground—liquefaction o Warning system now gives a few minutes warning, allows people to turn off gas, water, transportation systems, get out of buildings o Subduction zone therefore likely a reverse/thrust fault Chile 1960
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o Biggest earthquake measured by modern instrumentation o M w =9.6 o Convergent boundary, subduction zone caused destructive tsunami (common for this kind of boundary) o Reverse fault o Pacific Plate subducting under S.A. plate o Width of fault determines size of earthquake o Temperature determines depth of earthquake o Vertical fault vs. dipping fault, dipping faults are bigger because they represent a larger break ( | vs \ ) Northridge, CA 1994 o Not a great earthquake: 6.7 o Underground reverse fault launched upward motion great amount of damage, tossed buildings up into bthe air o Raised awareness about hidden faults o Reverse movement (mostly up and down as opposed to lateral) New Madrid, MO 1811-1812 o Played a role of the Native American confederation o Changed course of Mississippi River o Did not occur on a plate boundary, intra-plate earthquake Biggest one in the US Problematic: impossible to predict o May be associate with an old plate boundary rift, when Lurasia broke up to form modern Americas, failed attempt to split North America o Intensity as compared to San Fransisco
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Same intensity But New Madrid affected entire eastern US because of efficient hard
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Outline Prelim 1 - 06/03/2008 12:30:00 In Class Review...

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