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EESA06H3 (568)
Nick Eyles (500)
Lecture

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Department
Environmental Science
Course
EESA06H3
Professor
Nick Eyles
Semester
Summer

Description
• Example  of  a  transform  fault   • Plates  sliding  past  each  other   • Division  between  the  Pacific  plate  and  the  North  American  plate   • Los  Angeles  is  on  the  pacific  plate;  moving  northwards   o Will  be  part  of  Canada  soon   • Huge  areas  of  British  Columbia,  Yukon,  Alaska  are  made  out  of  rocks  that   originated  down  here   • Parts  of  the  San  Andreas  that  are  locked  are  dangerous   o Stress  is  suddenly  released  –  1906  earthquake   • Creeping  segments  in  middle  where  fault  is  moving  all  the  time   • Further  north,  the  system  changes  back  to  subduction   • Sharon  building  –  a  survivor   • If  the  buildings  are  on  sediment,  the  effects  of  the  earthquake  are  amplified   o If  they  are  on  rock,  the  buildings  survive   • Mercalli  scale  –  measure  of  how  much  damage  is  done;  systematic  survey   o Can  sometimes  identify  the  epicentre   • Effect  of  liquefaction:  subsidence  of  houses   o Water  within  the  sediment  (sand,  silt,  clay)   o Something  like  a  sponge   o This  is  how  we  get  ground  water   o Sediments  violently  shaken  will  liquefy   • Second  floor  windows  now  at  street  level     University  of  California  at  Berkeley   • Hayward  fault  runs  right  along  the  middle  of  memorial  stadium   o Being  torn  in  two   • So  it  has  to  be  held  up   • Bleachers  have  been  twisted   • Stanf
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