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Source Mechanism of Seismic Explosion Signals at Santiaguito Volcano, Guatemala: New Insights From Seismic Analysis and Numerical Modeling

Rohnacher, Alicia; Rietbrock, Andreas; Gottschämmer, Ellen; Carter, William; Lavallée, Yan; De Angelis, Silvio; Kendrick, Jackie E.; Chigna, Gustavo

Abstract:
Volcanic activity at the Santiaguito dome complex (Guatemala) is characterized by lava extrusion interspersed with small, regular, gas-and-ash explosions that are believed to result from shallow magma fragmentation; yet, their triggering mechanisms remain debated. Given that the understanding of source processes at volcanoes is essential to risk assessments of future eruptions, this study seeks to shed light on those processes. We use data from a permanent seismic and infrasound network at Santiaguito volcano, Guatemala, established in 2018 and additional temporary stations, including a seismic array deployed during a 13-day field investigation in January 2019 to analyze and resolve the source characteristics of fragmentation leading to gas-and-ash explosions. Seismic data gathered within a distance of 4.5 km from the vent show a weak seismic signal 2–6 s prior to the explosions and associated main seismic signal. To resolve the source location and origin of the seismic signals, we first used ambient noise analysis to assess seismic velocities in the subsurface and then used two-dimensional spectral element modeling (SPECFEM2D) to simulate seismic waveforms. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000130915
Veröffentlicht am 26.03.2021
Originalveröffentlichung
DOI: 10.3389/feart.2020.603441
Cover der Publikation
Zugehörige Institution(en) am KIT Fakultät für Physik (PHYSIK)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2296-6463
KITopen-ID: 1000130915
Erschienen in Frontiers in Earth Science
Verlag Frontiers Media
Band 8
Seiten Art-Nr.: 603441
Nachgewiesen in Scopus
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