Deformation and Volcano-Tectonic Seismicity Associated with Magma Accumulation to the North of Sabancaya Volcano in Southern Peru
DOI:
https://doi.org/10.47347/incasciences.v1i1.25Keywords:
Sabancaya volcano, deformation, volcano-tectonic seismicity, b-parameterAbstract
Sabancaya volcano, the youngest volcano in the Ampato-Sabancaya Volcanic Complex, is bordered to the north by the Hualca Hualca Volcano and to the south by the Ampato Volcano. Its constant eruption, over four years, represents a very important magmatic contribution that induces surface deformation. This deformation, measured between 2014 and 2020 with data from the Global
Positioning System (GPS) and Synthetic Aperture Radar (SAR) from ascending orbit, shows an inflation area of 3 - 4.5 cm/year; the unique modeling of both data sets allows us to infer that the location of the pressure source that generates the surface deformation is approximately 12.6 km deep below the Hualca Hualca Volcano. The pressure produced by this source has produced significant volcano-tectonic seismicity (VT) throughout the period analyzed. The hypocentral analysis of this type of seismicity suggests that
the fragile-ductile transition zone in the crust is located above 7 km below sea level, validating the depth of the pressure source associated with the offset magmatic reservoir involved in the eruption of the Sabancaya Volcano. The analysis of the results of the modeling of the deformation data and the recorded VT seismicity, in relation to the b-parameter heterogeneity areas identified
by Ortega et al. (2016), has allowed to illustrate a scheme based on the geological model of White & McCausland (2019). This diagram illustrates the magma chamber involved in the eruption of the Sabancaya Volcano, the fragile-ductile transition zone in the crust and the possible structures that allow the magma to rise to the surface, feeding the current and constant eruption of the
Sabancaya Volcano.
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