Figure 4
From: Forecasting Effusive Dynamics and Decompression Rates by Magmastatic Model at Open-vent Volcanoes
(a) Ground deformation during the 2007 (black) and 2014 (red) effusive eruptions, recorded by a borehole tiltmeter at the station OHO. The normalized ground deformation (dashed red for the 2014) is also shown. Tiltmeter locations are reported in Fig. 1. (b) The normalized VLP dip for the 2007 and 2014 eruptions. (c) Discharged volumes during the 2014 (red) and 2007 (black) eruptions. 1985 and 2003 trends are also shown (dashed gray) for comparison. (d) Percentage of the magma volume drained from the reservoir, modeled using equation (5). Despite the volume of magma considered, the model predicts that the drainage of the volume stored in the reservoir always follows the same exponential discharge trend. The largest decompression rate coincides with the inflection point (black dot) of the discharge trends, which indicates that 98% of the magma volume is drained out of the reservoir in the first 3 days of the effusive eruption (equation (10)).
