Tidal oscillations in Halemaumau, the lava pit of Kilauea

Abstract
Brown reports measurements by vertical angles of the height of the solid crust and of the liquid lake lava in Halemaumau, as made by T.A. Jaggar at 15- and 20-min intervals over 28 days in 1919. Analyses of these data reveal fluctuations with periods of the lunar day and lunar half day, with double amplitudes of about an inch. The evidence is believed sufficient to warrant further observations on the lava crust over a longer period, but at less frequent intervals. Variations of the liquid lava are too irregular to show small tidal effects.

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