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~. <br />i ~~ ~ 1 <br />,.~ <br />(. <br />1 / DI <br />~ r. i ~ i <br />'INTRODUCTION <br />~ ; ,-nJ <br />r-~l~ ~~ MicroGeophysics Corporation conducted a study of ground motion <br />~a <br />IIi `~~~._lresulting from shots at the Deer Creek Canyon Quarry operated <br />r '7by Winslow Construction Company (rigure I). This study consisted <br />~~~ ,~ <br />~••~of two parts: the monitoring of a production shot on July 3, <br />~..~ . -~;g-!1979 and a review of existing seismic records from shots fired <br />~'~ ~ . " '~ •'r between June 1978 and July 1979. <br />i ~~~ The purpose o£ this study was to determine the peak particle <br />..~ ., <br />`;c~'~"~•velocities in the vicinity of the ?'ainter house induced by <br />r ,.. ~.-~~routine quarry shots. The four site monitoring program measured <br />,,,_ actual ground motion resulting from a single shot. The revie;{ <br />5...~ ~`s'~of other seismic records allows comparison of the ground motion <br />~;- , <br />"~~' ~ caused by other shots in the past year to confirm that the <br />~~ ,~.r`. <br />t9 :-';~~:°d observations from the Julie 3 shot are representative of the <br />~ ~ _ ",~ effects of previous operations. <br />~,,.; Six hundred pounds of Unigel 603 were detonated in the July 3, <br />,y'''<;,:;^~ 1979 shot. The explosives were divided among 70 shallow drill <br />mow. ~ <br />~r holes. All the holes were wet providing maximum coupling <br />"""' „~;,abetween the energy of the explosives and the energy propogated <br />i ~ ~ ~ <br />+ '~ `• ,.~ ~~~~" in seismic, waves. <br />- ",-~ .- <br />I <br />G _. .. ~ ,, <br />~;'•. <br />,~.~ ,.~ <br />LJ "~ "~ <br />.. '--v <br />~i _..._..:i <br />~ ~ ~,• ~ <br />.. k: .~ i. <br />~' ` +~ <br />~ ,' . <br />j ,-~ ;;-~ ..~.~~ 1 <br />-~ MICROGEO['H~~'S~~::~ <br />