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_ -- . <br /> <br />c.~ ~ <br />. ~. <br />% ~ ~ OBSERVATIONS <br />L/ Personal observations of the July 3 shot effects were made at <br />- - •%~ three sites. At the conveyor, there was a strong ground motion <br />_ '~~.,1 <br />{~~ ~~'~~•'ry.~and a very strong air blast which shook the conveyor housing. <br />4+ ~'' .:. <br />~"'~;.~The blast produced a dust clou3 and a shower of small rocks on <br />"f . '' ,: ~~ the ctii~+7~y6Y hau~ia~. At the 0ae~hang gYeuad ft16t1Bfl WdS Y@YC@~3ti~3t@ <br />~'v ~'+~but not strong.,. No direct air blast was evident, but the sound <br />~~. ..,•';•. T, <br />-~-~',~~iof the blast echoed off of the south canyon wail. The sharp report <br />-J +~~~of the detonating cord on the surface was very noticeable. An <br />,observer near the bridge on the road noticed a eery clear ground <br />-f=' ' <br />'` motion, probably perceptible to a person walkinc at the time of <br />J the shot. The sound was a single rumble that was not particularly <br />' ~!3;.;,"~~~` loud or startling. The instrumental observations are summarized <br />f ~~ <br />~~ <br />In:.. -~' <br />r 5~.; ,~.~ in Table 2. <br />\p~ ~J"~ i~_ +-` ~~+ TABLE 2 <br />Ll~t~=` ~ INSTRUMENTAL OBSERVATIONS <br />~. .. ...~ ~:.r t~ <br />Plan Distance <br />...,., " q Site From Shot Longitudinal Transverse Vertical <br />~~ ~~ <br />,~.,,;-. -; House 1059 ft 0.04 m/sec 0.04 m/sec '0.05 m/sec <br />-.-~,'~~.-yOVerhang 916 0.13 0.12 0.16 <br />..~ d/ <br />. ~r:.'::Ridge 303 0.22 <br />"Conveyor 10 0.41 0.40 0.58 <br />,,a..~,.., .. <br />~ ~~ <br />~'~; ,r~COmplete descriptions of monitoring site conditions and observa- <br />~ .`~, tions are given below. ` <br />''`~ <br />-,'~ <br />.. -w <br />~<. ..... ~-...3. ~~ <br />Sk '-y ~ ~T <br />` `t?1~ <br />... ~ ~~YJ n.~ <br />~~.•'~~. MICROGEOI'HYSICS <br />