Impact of Crustal Rheology on Temperature‐Dependent Viscoelastic Models of Volcano Deformation: Application to Taal Volcano, Philippines. Issue 1 (25th January 2019)

• Record Type: Journal Article
• Authors: Morales Rivera, A. M.; Amelung, F.; Albino, F.; Gregg, P. M.
• Is Part Of: Journal of geophysical research. Volume 124:Issue 1(2019)
• Page Start: 978
• Page End: 994
• Publication Date: 2019-01-25
• Subjects: volcano deformation -- Taal volcano -- InSAR -- viscoelastic modeling -- finite element analysis; Geomagnetism -- Periodicals; Geochemistry -- Periodicals; Geophysics -- Periodicals; Earth sciences -- Periodicals; 551.1
• DOI: 10.1029/2018JB016054
• Languages: English
• ISSNs: 2169-9313

Abstract

Abstract: We use ALOS‐1 interferometric synthetic aperture radar data spanning the period of 2007–2011 to obtain time‐dependent ground deformation data over Taal caldera related to the 2010–2011 volcanic unrest, which did not lead to an eruption. We employ finite element models that account for subsurface thermomechanical properties to test for viscoelastic deformation. We also examine the variability of crustal rheological parameters of the temperature‐dependent Arrhenius formulation for viscosity, to investigate the effects on surface deformation. Deformation at Taal is observed to be time dependent and explained by a linear rate of pressure increase in a shallow magma reservoir at 5‐km depth within a hot and viscoelastic upper crust. The best‐fitting rheological properties of the local setting are consistent with either a felsic or hydrothermally altered uppermost crust. We show the significantly different effects that the variation of rheological parameters has on surface deformation, highlighting the importance of incorporation into future studies of deformation at different volcanic settings. Key Points: Deformation during the 2010–2011 unrest at Taal volcano is explained by inflation of a shallow magmatic source Numerical models of viscoelastic deformation revealed rheological properties that fit the local geologic setting Surface deformation effects from the variability of Arrhenius parameters were demonstrated for different volcanic settings