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  Insights into Persistent Activity, Crater Formation & Phreatic to Phreatomagmatic Eruptions at Telica Volcano from Multiparameter Observations

LaFemina, P., Saucier, E., Chavarria, D., Feineman, M., Geirsson, H., Hanagan, C., Higgins, M., Rodgers, M., Roman, D., Saballos, A., Strauch, W., Tenorio, V. (2023): Insights into Persistent Activity, Crater Formation & Phreatic to Phreatomagmatic Eruptions at Telica Volcano from Multiparameter Observations, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4438

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Datensatz-Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021868 Versions-Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021868_1
Genre: Konferenzbeitrag

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Urheber

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 Urheber:
LaFemina, Peter1, Autor
Saucier, Emilie1, Autor
Chavarria, David1, Autor
Feineman, Maureen1, Autor
Geirsson, Halldor1, Autor
Hanagan, Cassie1, Autor
Higgins, Machel1, Autor
Rodgers, Mel1, Autor
Roman, Diana1, Autor
Saballos, Armando1, Autor
Strauch, Wilfried1, Autor
Tenorio, Virginia1, Autor
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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Schlagwörter: -
 Zusammenfassung: Telica volcano is a persistently restless volcano with activity expressed as long-lived high-temperature fumaroles and magmatic degassing, high rates of background seismicity and frequent phreatic to phreatomagmatic eruptions. Two decades of geophysical, geochemical, and geologic observations indicate: 1) long-lived fumaroles cause hydrothermal alteration and collapse of crater walls, and deposition of debris in the crater; 2) decreases in gas flux, fumarole temperatures, remotely sensed thermal anomalies, and low-frequency seismicity prior to explosions and eruption of hydrothermal minerals and alteration products indicate sealing of the shallow hydrothermal system and conduit; and 3) eruption of a lava dome and ballistic blocks indicate viscous basaltic andesite magma in the conduit. Deposition of crater wall debris may seal the system at a shallow level but does not affect the deeper magmatic – hydrothermal system. Whereas the partial to complete sealing of the volcanic conduit occurs through the deposition of hydrothermal minerals, and the slow migration of viscous magma. These processes move the volcano from an open to a closed system, resulting in phreatic to phreatomagmatic explosions. We developed a numerical model to investigate near-field surface deformation measured by cGPS. Our model incorporates changes in permeability of the conduit due to mineralization, the accumulation of gas beneath the seal, and subsequent increase in pressure of the system driving surface deformation. Increase in pressure leads to failure of the seal and explosions. Improving our knowledge of this transition from an open to closed system is important for forecasting explosive activity at Telica and similar volcanic systems.

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Sprache(n): eng - Englisch
 Datum: 2023-07-112023-07-11
 Publikationsstatus: Final veröffentlicht
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 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
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 Identifikatoren: DOI: 10.57757/IUGG23-4438
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Veranstaltung

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Titel: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Veranstaltungsort: Berlin
Start-/Enddatum: 2023-07-11 - 2023-07-20

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Titel: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Genre der Quelle: Konferenzband
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: Potsdam : GFZ German Research Centre for Geosciences
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