Recent field work conducted on Mount Rainier and Mount Adams, Washington, and Pico de Orizaba, Mexico (Bowman et al., 2003; Zimbelman et al., 2003) has concentrated on assessing volcano rockmass strength for use in edifice stability studies. Preliminary rockmass strengths of these volcanoes have been measured using a combination of point load index testing, direct shear testing on discontinuities, uniaxial compression testing, and vane shear testing on discontinuity fillings. Because of the extreme height of several of these volcanoes and the difficulty in transporting loads to and around the edifice areas, it is imperative to use equipment...

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