L04_GravAnalysisExamples-page10

L04_GravAnalysisExamples-page10 - Gravity Anomalies: 2D...

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Applied Geophysics – Analysis and examples Spreadsheet: Grav2Dcolumn Gravity Anomalies: 2D forward calculation for rectangular paral elepipeds with greater vertical extent than horizontal see Dobrin and Savit eq 12-34 Define density structure Profile 1 Profile2 Adjust bold numbers… Adjust bold numbers… coulum center (km) density contrast (g/cm3) top (km) bottom (km) error check density contrast (g/cm3) top (km) bottom (km) error check 0 -0.3 0 0 OK 000 OK 1 -0.3 4 4.4 OK OK 2 -0.3 4 4.4 OK OK 3 -0.3 4 4.3 OK OK 4 -0.3 4 4.3 OK OK 5 -0.3 4 4.4 OK OK 6 -0.3 4 4.4 OK OK 7 -0.3 4 4.5 OK OK 8 -0.3 4 4.6 OK OK 9 -0.3 4 4.7 OK OK 10 -0.3 4 4.8 OK -0.9 8 12 OK 11 -0.3 4 4.7 OK OK 12 -0.3 4 4.6 OK OK 13 -0.3 4 4.5 OK OK 14 -0.3 4 4.4 OK OK 15 -0.3 4 4.4 OK OK 16 -0.3 4 4.3 OK OK 17 -0.3 4 4.3 OK OK 18 -0.3 4 4.4 OK OK 19 -0.3 4 4.4 OK OK 20 -0.3 0 0 OK OK Gravity anomaly -2.50 -2.00 -1.50 -1.00 -0.50 0.00 0 2 4 6 8 10 12 14 16 18 20 distance (km) dgz (mGal) Profile 1 Profile 2 Profile 1 0 2 4 6 8 10 12 14 01234567891 01 11 21 31 41 51 61 71 81 92 0 depth (km) Applied Geophysics – Analysis and examples Spreadsheet: Grav2Dcolumn Gravity Anomalies: 2D forward calculation for rectangular paral elepipeds with greater vertical extent than horizontal see Dobrin and Savit eq 12-34 Define density structure Profile 1 Profile2 Adjust bold numbers… Adjust bold numbers… coulum center (km) density contrast
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