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<br /> 250 <br />• ~ 200 <br />_z <br /> <br />N 150 <br /> <br />z <br />0 <br />~ <br /> 100 <br />z <br />O <br />J <br />O <br />50 <br />F <br /> 0 <br />+ B-inch PVC <br />O 12-inch NEW <br />• 12-inch OLD <br />^ 20-inch <br />+ + + ~ ^ <br />+ ++ + ~ O • <br />ee® o~ ' ~ ~ <br />0 2 4 6 S 10 <br />GROUND VIBRATION, VERTICAL, iNs <br />Figure 9.- Longitudinal strain and surface vertical vibration <br /> 250 <br />~ <br /> 200 <br />z_ <br /> <br />~ ~ 150 <br />z <br />0 <br /> <br /> 100 <br /> <br />J <br />a <br />~ <br />50 <br /> <br /> 0 <br />+ 8-inch, PVC <br />O 12-inch, NEW <br />• 12-inch, OLD <br />^ 20-inch <br /> <br />^ [] <br />*+ ~ + <br />+ +++ ^ + <br />+ + 8 ~~ o ~ ~ <br />e ~ ~ I r <br />o z a s a 10 12 <br />GROUND VIDRATION, TRANSVERSE, iNs <br />Figure 10.- Longitudinal strain and surface transverse vibration <br />~J <br />148 <br />