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Mr, pale Ream <br />Cooley Gravel Co. <br />July 10, 1972 <br />Page 6 <br />Table 2 <br />Data Reduction for Morrison Quarry Shot <br />Cooley Gravel Company <br />June 17, 1972 <br />Analysis of Sprengnether 5-7000 Record <br />The instrument, a vertical pendulum with a velocity transducer, was <br />operated in a vertical mode, with a natural frequency of 1. 2 seconds <br />and 0. 6 of critical damping. <br />A calibration of the instrument indicates <br />1 cm of Pen Movement = 0. 036 cm/sec Vertical Ground <br />Motion at 6 hz <br />Although the pen registration was poor (bad inking}, the maximum <br />deflection was approximately full scale (5 cm) aplitude at a frequency <br />of 6 hz. <br />Maximum Vertical Velocity: 0.18 cm/sec or 0.07 in/sec <br />This velocity compares well with the accelerometer derived velocity <br />of 0.08 in/sec. <br />