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<br /> <br />en <br />--- <br />t: <br />:=.. <br /> <br />~ <br />(3 <br />o <br />~ <br />UJ 1.0 <br />> <br />w <br />~ <br />u <br />i= <br />c: <br />< <br />c. <br /> <br />10.0 <br /> <br /> <br /> <br />100 <br /> <br />(iJ <br />"> <br />c::: <br /> <br />10 <br /> <br /> <br />I <br />100 <br /> <br />Source: United States Bureau ojMines Report ojInvestigation 8507. "Structure Response and Damage <br />Produced by Ground Vibrationfl'om Surjace Mine Blasting. " <br /> <br />US8M ALTERNATiVE BLASTING LEVEL <br />(ADAPTED FROM RI 8507, 1980) <br /> <br />2.0 in/s <br />(50 mm/s) <br /> <br /> <br />0.75 ir!s, DRYVVALL <br />(19 mm/s) <br /> <br /> <br />/ <br />, <br /> <br />- - - ~ - - - - - - - - -' <br />050'in!s, PLASTER <br />1(12.7 mmJs) <br /> <br />0.11 <br /> <br /> <br />10 <br />FREQUENCY (HZ) <br /> <br />