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<br />1) <br /> <br />lnto the rock where lt refreezes during the nlght. The expansion of the <br /> <br />WHY A SOURCE AREA FOR THE SLUMGULLION EARTHFLOW? <br /> <br /> <br />'J" <br />=.. <br />:J" <br />-.I <br />~ <br />~ <br /> <br />lce upon refreezlng causes an increase of pressure wlthln the fracture. <br /> <br />The fractures enlarge to relieve <br /> <br /> <br />the pressure and eventually rocks <br /> <br /> <br />released by thls process fall onto <br /> <br />the source area. <br /> <br />These processes of clay <br /> <br /> <br />swel11ng and frost heav1~ are <br /> <br /> <br />probably the most 1mportant mechanlsms <br /> <br /> <br />act1ve 1n the source area for the production <br /> <br /> <br />of mater1als for the Slumgull10n earthflow. <br /> <br />You m1ght ask, "Why should there have been a source area for the <br /> <br /> <br />earthflow in the first place?" <br /> <br /> <br />The answer 1s probably much more complicated than the following <br /> <br /> <br />explanation, however the most important factors are found w1thin the <br /> <br />source materials themselves. <br />