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L02_GravTheoryMeasurement-page9 - Correcting for drift...

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Applied Geophysics – Gravity theory and measurement Drift Gravity surveying The reading of a gravimeters at a point changes with time! Causes Instrument drift: due to environmental changes (P,T) and spring creep Earth tides: relative rotations of the earth, moon and sun Applied Geophysics – Gravity theory and measurement
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Unformatted text preview: Correcting for drift Gravity surveying 1. Return to base station periodically 2. Assume drift is linear 3. Correct measurements in loop How often? Depends on requires accuracy • max tidal rate: 0.05 mGal/hr • instrument drift usually less...
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