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<br />10 <br /> <br />such as large rock falls. may cause a wave of movement to progress from the <br /> <br />o <br />o <br />o <br />-a <br />Q <br />C) <br /> <br />source to the toe. One other posslblllty ls that the flow may perlodlcally <br /> <br />surge downhlll and then move slowly. Thls last posslblllty could be <br /> <br /> <br />lnduced by heavy ralns assoclated wlth the sudden addltlon of materlal at <br /> <br />the source. <br /> <br />Fleld lnvestlgatlon of the source area suggests that the addltlon <br /> <br />of rock debrls ln the source area ls a constant. 1.e. rock materlals are <br /> <br />contlnuously belng added onto the flow at the source as rock falls. If <br /> <br />source materlals are belng added <br />contlnuously, then the thlrd <br /> <br />suggested posslblllty explalnlng <br /> <br />the unusual movement of the actlve <br /> <br />flow ls lnvalld. <br /> <br />Measurements taken of <br /> <br />movements of the control stakes <br /> <br />lndlcate that a wave motlon, slmllar <br /> <br />to the second posslblllty suggested <br />above ls ln effect. If thls ls the <br /> <br /> <br />"A",o ":I. "15d to <br />~~ ~""'e <br />.. fo....es-\ Sec'"'Jice. <br />~o\'" a ~Il'lt\~(" <br />';:>0\0 '. " <br />