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Papers by Daniel Sierra
Environmental Assessment of Patagonia's Water Resources
Desalination and Water Treatment, 2019
Chemical, Granulometrical and Componentry analisys corresponding to Historical primary lahar depo... more Chemical, Granulometrical and Componentry analisys corresponding to Historical primary lahar deposits on the eastern-drainage of Cotopaxi volcano.
Journal of Volcanology and Geothermal Research, 2021
Journal of South American Earth Sciences, 2019
Geochemistry, Geophysics, Geosystems, 2018
Through integration of multiple data streams to monitor volcanic unrest scientists are able to ma... more Through integration of multiple data streams to monitor volcanic unrest scientists are able to make more robust eruption forecast and to obtain a more holistic interpretation of volcanic systems. We examined gas emission and gas geochemistry and seismic and petrologic data recorded during the 2015 unrest of Cotopaxi (Ecuador) in order to decipher the origin and temporal evolution of this eruption. Identification of families of similar seismic events and the use of seismic amplitude ratios reveals temporal changes in volcanic processes. SO2 (300 to 24,000 t/d), BrO/SO2 (5–10 × 10−5), SO2/HCl (5.8 ± 4.8 and 6.6 ± 3.0), and CO2/SO2 (0.6 to 2.1) measured throughout the eruption indicate a shallow magmatic source. Bulk ash and glass chemistry indicate a homogenous andesitic (SiO2 wt % = 56.94 ± 0.25) magma having undergone extensive S‐exsolution and degassing during ascent. These data lead us to interpret this eruption as a magma intrusion and ascend to shallow levels. The intrusion prog...
Earth and Planetary Science Letters, 2017
Environmental Assessment of Patagonia's Water Resources
Desalination and Water Treatment, 2019
Chemical, Granulometrical and Componentry analisys corresponding to Historical primary lahar depo... more Chemical, Granulometrical and Componentry analisys corresponding to Historical primary lahar deposits on the eastern-drainage of Cotopaxi volcano.
Journal of Volcanology and Geothermal Research, 2021
Journal of South American Earth Sciences, 2019
Geochemistry, Geophysics, Geosystems, 2018
Through integration of multiple data streams to monitor volcanic unrest scientists are able to ma... more Through integration of multiple data streams to monitor volcanic unrest scientists are able to make more robust eruption forecast and to obtain a more holistic interpretation of volcanic systems. We examined gas emission and gas geochemistry and seismic and petrologic data recorded during the 2015 unrest of Cotopaxi (Ecuador) in order to decipher the origin and temporal evolution of this eruption. Identification of families of similar seismic events and the use of seismic amplitude ratios reveals temporal changes in volcanic processes. SO2 (300 to 24,000 t/d), BrO/SO2 (5–10 × 10−5), SO2/HCl (5.8 ± 4.8 and 6.6 ± 3.0), and CO2/SO2 (0.6 to 2.1) measured throughout the eruption indicate a shallow magmatic source. Bulk ash and glass chemistry indicate a homogenous andesitic (SiO2 wt % = 56.94 ± 0.25) magma having undergone extensive S‐exsolution and degassing during ascent. These data lead us to interpret this eruption as a magma intrusion and ascend to shallow levels. The intrusion prog...
Earth and Planetary Science Letters, 2017