Reference no: EM13764022
Referring to Fig. 2.1 on page 24/100 of the notes=> 5642Lectures_2_4.pdf, consider a set of 5 horizontally infinite cylinders with the following parameters è
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Cylinder #
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1
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2
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3
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4
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5
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d (km)
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-34
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-20
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0
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20
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35
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z (km)
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2
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3
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5
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10
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10
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R (km)
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2
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1
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3
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4
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3.5
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Δρ (gm/cm3)
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3.0
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5.0
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1.0
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2.0
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1.5
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A) Along a bisecting profile extending from d = -64 km through 0 km to +64 km at 1-km intervals, compute the 5 gravity profiles in mgal by
gz = [41.93 Δρ(R2/z)]/[(d2/z2) + 1],
and plot them superimposed on a single graph using different colors or symbols. Computer software (e.g., IMSL, LINPACK, Matlab, Mathematica, MathCad, Maple, etc.) may be helpful here.
B) Compute and 1) plot the total gravity effect of the 5 cylinders by summing their effects at each observation point on the profile. 2) What is the mean value and standard deviation of the total gravity effect? 3) What is the utility of these statistics for graphing the profile?
C) Suppose you want to estimate the 5 densities (Δρi) from the total gravity observations in B-above. Determine 1) the [ATA]-matrix and 2) least-squares estimates of Δρi, and 3) compare the estimated densities with those in the above table.
D) Determine 1) the Choleski factorization of [ATA] - i.e., determine a lower triangular matrix L such that [LLT = ATA]. 2) Find the coefficients of [P] such that [LP = ATB], and 3) solve the system for the least-squares estimates of Δρi. 4) Compare your density estimates with those you obtained in C-above.
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Compute and plot the total gravity effect
: Compute and plot the total gravity effect of the 5 cylinders by summing their effects at each observation point on the profile. What is the mean value and standard deviation of the total gravity effect. What is the utility of these ..
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