Analyzing the roughness of the discontinuous surface in Mt. Semeru Eruption rock

From the moment they were formed to deposition process, characteristics and properties of rocks that form on earth's surface vary. The effects Mount Semeru's eruption will be transported deposited, eventually solidifying into rock masses. As a result weak places like joints, fractures, fissures, where density, filling, orientation are not continuous, masses in nature have discontinuous or qualities. Rock shear strength decreased if there planes bulk. Using Barton's empirical equation Joint Roughness Coefficient (JRC) parameter, roughness conditions can measured. Determining features mass influenced by Semeru based variations accordance with Barton Choubey's criterion is therefore crucial. observation plane as necessary get many parameters, which then used determine friction angles, undulation values, cohesion values plane.