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The lava fountain at the lower vent reaches consistently about the same height as the elevation of the summit vents, which eject gas-rich jets: this could be explained by fluid mechanics, where the conduits of both vents are connected and both filled with magma to the rim, but the difference in hydrostatic pressure between the lower and upper pushes the liquid out from the lower vent to reach the same height as it stands in the connected upper vent. This balance seemed to have been be maintained throughout the day and most night. Gasses mainly escape in continuous jets from the upper vents, likely because they managed to separate from the liquid magma at some depth to form an own vertical conduit inside the magma column. (Photo: Tom Pfeiffer)