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Analysis reveals seasonal pressure cycles atop a volcano, indicating distinct daily patterns.
Pressure data taken for 28 months atop a 10,000 feet high volcano in Hawaii, are analysed for daily cycles, Periods with 24, 12 and 8 hours are established. The amplitude and phase of these variations oscillate with the seasons in a characteristic manner; except the phase of the 8 hour variation which rotates backwards in time a full 360 degrees in one year. No significant variation with a 6 hour period could be detected.
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G. Reber (1957) studied this question.
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