Fig. 12
From: Muon tomography: Plans for observations in the Lesser Antilles
Top: Time evolution of the temperature in the acid lake of the Tarissan pit. Observe the transient increases of temperature which may be due to fluctuations of the gas flux. Bottom: Time evolution of the pH in the boiling lake in the Tarissan pit. Observe the step-like nature of the evolution curve, which may be produced by gas release in the magma chamber.