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Table 4 Estimation of the gravitational attraction associated with a cylinder a depth

From: Environmental and anthropogenic gravity contributions at the Þeistareykir geothermal field, North Iceland

Parameter

Symbol

Value

Gravitational constant

G

6.67 10–11 m3 kg−1 s−2

Volumic mass cylinder

ρ

1000 kg m−3

Thickness cylinder

h

20 m

Height above cylinder

z

2000 m

Porosity

φ

0.1

Mass considered

M

23,652,000,000 kg

Fluid volume

Vfluid = M/ρ

236,520,000 m3

Rock total volume

Vtotal rock = (M/ρ)/φ

2,365,200,000 m3

Volume cylinder

Vcyl = π*r*r*h

 

Radius cylinder

rcyl = sqrt( V/(π*h))

1940 m

Gravity (including porosity)

g

2.35 10–7 m s−2