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~'~ . " .r <br />,~' zl <br />} <br />i"~. <br />_; A graph was constructed of the relationship between peak particle <br />~~ veolcity and scaled distance to demonstrate the attenuation of <br />.,..: ,' <br />1~~~ seismic energy over distance (Figure 3) . The attenuatio~t can <br />~~r:...r ...:,~,y. . <br />qJ be expressed by the equation: <br />.,. ,•.1 <br />~~ ' -~41 <br />~,~•,~~..f ~ Ir <br />y.•.. 1 1 ~~ ~B <br />/~+"' rr V = H L <br />•.. ~~ ~ `'.~~ max <br />~. <br />~.-~~r.~'`~--~~ where: W =maximum charge per delay in lbs <br />„'-~ ,;. L"~~. D = shot point to receiver distance in feet <br />" -'- `"~ and: Hand Bare coefficients of attenuation interpreted <br />t~'fi'. <br />•~•~=~i'•s from the shot monitoring data. For the Deer Creek Canyon <br />,. • !: ,< <br />~" Quarry shot H = 7.8 and B 1.02. Knowing the coefficients of <br />.;~.~•.i~:i'~~" " ,° attenuation, maximum peak particle velocity can be predicted for <br />~'~`',y"h:.~•._ _;; any point for a given shot size. <br />~ J ~F R, <br />,~N.; ~.. <br />•- _~~~_J <br />~`~' <br />` `S~ 1 J <br />~~~ <br />~.,~R Y <br />-1 _,::" <br />•~ ~i . <br />. w. . <br />. , <br />>>s.~,,v,~~ <br />.~ :.:.-: <br />.;~ A ~. <br />'~ <br />~~.t ~ ~~ <br />.•!a,,A; <br />_ -~ <br />'~ ~r:,~~ <br />,~ <br />~t ~~~ <br />,. <br />...r~" <br />4 ~~ <br />~~ <br />.~„ ~. <br />~ :;r%' ~ <br />~ ~ ~.-~~~~~`~ MICROGEOI'HYSICS <br /> <br />