gravproblem6.8 - radius), given that the object has a...

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Geol 454 Environmental and Exploration Geophysics I Gravity Problem Set 3 Will have opportunities to discuss Thursday and next Tuesday Due date – Nov. 17 th ) 3. What is the radius of the smallest equidimensional void (e.g. chamber in a cave) that can be detected by a gravity survey for which the Bouguer gravity values have an accuracy of 0.05 mGals? Assume the voids are formed in limestone (density 2.7 gm/cm 3 ) and that void centers are never closer to the surface than 100m. (Problem 6.5 from Burger et al.) 4. The curve in the following diagram represents a traverse across the center of a roughly equidimensional (i.e. roughly spherically shaped) ore body. The anomaly due to the ore body is obscured by a strong regional anomaly. Remove the regional anomaly and then evaluate the anomaly due to the ore body (i.e. estimate its depth and approximate
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Unformatted text preview: radius), given that the object has a relative density contrast of 0.75 g/cm 3 with surrounding strata. Problem 6.8, Burger et al.). Horizontal Position (km) 0.0 0.5 1.0 1.5 2.0 Bouguer Anomaly (mGal)-1.50-1.25-1.00-0.75-0.50-0.25 0.00 Horizontal Position Bouguer Anomaly (mGal) 0.1 -1.45 0.2 -1.36 0.3 -1.27 0.4 -1.17 0.5 -1.07 0.6 -0.96 0.7 -0.85 0.8 -0.74 0.9 -0.64 1 -0.56 1.1 -0.49 1.2 -0.44 1.3 -0.4 1.4 -0.36 1.5 -0.32 1.6 -0.27 1.7 -0.22 1.8 -0.16 1.9 -0.1 2 -0.03 5. Determine the depth to the center of each of the three equidimensional bodies (~spheres) producing the anomalies (A, B, and C) shown in the figure below. (Similar to problem 6.9 from Burger et al.). 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5-1500-1000-500 500 1000 1500 Distance from peak (m) Bouguer Anomaly (mGals) B. C. A....
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gravproblem6.8 - radius), given that the object has a...

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