Gravity & magnetic prospecting

The image represents

• Zonal Harmonics

• Sectoral Harmonics

• Tesseral harmonics

• None of the above

Gravity anomaly observed on the surface is due to ............

• Vertical density variations

• Lateral variations of density

• Deeper variations of density

• Shallower density contrasts

difference between equatorial radius and polar radius of the earth is

• 14 km

• 21 km

• 7 km

• 12 km

The proportionality constant between the intensity of magnetisation and the magnetic field strength is called

• magnetic permeability

• magnetic susceptibility

• magnetization constant

• magnetic moment

Crustal field contains magnetisation effects from ...............

• Only induced field

• neither induced field nor remnant field

• Only remnant field

• both induced and remnant field