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<br />11 <br /> <br />case, then the rates of movement should 1ncrease down-slope unt1l the toe <br /> <br />1s reached. The process would beg1n aga1n as new overburden mater1al slldes <br /> <br />onto the source area. <br /> <br />o <br />o <br />o <br />-.J <br />o <br />..... <br /> <br />SOURCE ROCK <br /> <br />The source materlals of the Slumgulllon earthflow are volcanlc rocks <br /> <br />that have been hlghly altered or changed by relatlvely hlgh temperature <br />waters (lnjected hydrothermal waters) that were lntroduced through flssures <br />or cracks that developed ln the rocks after orlginal deposltlon as lava <br />flows and ash deposlts. These altered volcanlc rocks are latltes and <br />brecclas of the Potosl volcanlc serles of Tertlary a~e (old, broken, hard <br /> <br />rocks causes fast dlslntegrat10n of the <br /> <br />? <br />I ~'q"-f..."" <br />/1 . lJ--JI ? <br />..... h' ~." <br />b,.eC II). ~ <br />.... "111 I <br />?o-t-o' ~"tJ.r(/ . <br />1 ~("'"' J <br /> <br /> <br />rocks from a volcano). <br />The alteratlon of the volcanlc <br /> <br />rock mater1als after they fall onto the <br />source area. You wlll notlce that the <br /> <br />major1ty of the flow materlal ls clay <br />