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ig i <br />i~i <br />TABLE 2 -Summary of Ground Vibration Damage <br /> Particle Velocity Particle Velocity <br /> (in/sec) (in/sec) <br /> Nicholls, et al. Langefors et al. <br />Damage Criteria (1971) (1958) <br />Safe, No noticeable Damage < 2.0 < 3.0 <br />Caution, Loosening of paint, small cracks 2.0 to 4.25 3.0 to 4.25 <br />at joints, lengthening old cracks. <br />Minor Damage, loosening of plaster, 4.25 to 6.5 4.25 to 6.0 <br />cracks in masonry around openings <br />Major Damage, Cracks in walls, 6.5 to 10 6.0 to 10 <br />structural weakening, fall of masonry <br />~^ A G R A <br />Eerth & Envimnmen te/ Gmup <br />