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Ground tilt has been measured daily for twenty-seven years at the Hawaiian Volcano Observatory, Hawaii National Park. A brief discussion of instrumental measurement of tilt is given. Resultant tilt has been computed for the entire record and is shown as a general chart. Resultant tilt for individual years with volcanic outbreaks is shown. Tilt represents deep-seated pressure changes and is correlated with volcanic activity and with ground-level changes. Local loading affects tilt but slightly.
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Hugh Henry Waesche (1942) studied this question.
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