Volcano number: | 353040 |
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Region: | South America |
Country: | Ecuador |
Geodetic measurements? | Yes |
Deformation observation? | Yes |
Measurement method(s): | InSAR |
Duration of observation: | 1992 - 2001 |
Inferred cause of deformation: | Magmatic |
Characteristics of deformation: |
If we assume a sim- ilar value for magma emplaced beneath Alcedo, between 0.6 and 10% of the magma would need to crystallize each year, to give the model distribution of volume reduction at 95% confidence. Note that the probability distribution for percentage of crystallization is less well constrained than that for volume reduction, as it also de- pends on the total volume which is not so well constrained. Cooling of the solidified magma could also contribute further to the volume reduction, with up to 2% contraction being the estimated value for solidified Krafla magma. Loss of volatiles from the magma chamber would reduce the pressure, also leading to a reduction in volume, but the pressure decrease required to produce the surface displacements
would be between 23 and 370 MPa yr−1 at 95% confidence. This range is too high to be plausibly produced by the loss of volatiles alone. Ref 1
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References: | 'Hooper, A., Segall, P., & Zebker, H. (2007). Persistent scatterer interferometric synthetic aperture radar for crustal deformation analysis, with application to Volcán Alcedo, Galápagos. Journal of Geophysical Research: Solid Earth, 112(B7).' |
Location: | -91.12, -0.43 |