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Temporal Seismic Velocity Changes During the 2020 Rapid Inflation at Mt. Þorbjörn-Svartsengi, Iceland, Using Seismic Ambient Noise

Temporal Seismic Velocity Changes During the 2020 Rapid Inflation at Mt. Þorbjörn-Svartsengi, Iceland, Using Seismic Ambient Noise


Title: Temporal Seismic Velocity Changes During the 2020 Rapid Inflation at Mt. Þorbjörn-Svartsengi, Iceland, Using Seismic Ambient Noise
Author: Cubuk-Sabuncu, Yesim
Jónsdóttir, Kristín
Caudron, Corentin
Lecocq, Thomas
Parks, Michelle Maree
Geirsson, Halldór
Mordret, Aurélien
Date: 2021-06-01
Language: English
Scope:
Department: Faculty of Earth Sciences
Series: Geophysical Research Letters; 48(11)
ISSN: 0094-8276
DOI: https://doi.org/10.1029/2020GL092265
Subject: Jarðskjálftamælingar; Eldfjöll; crustal deformation; Iceland; seismic ambient noise; seismic interferometry; seismic velocity changes; volcano monitoring; Geophysics; Earth and Planetary Sciences (all)
URI: https://hdl.handle.net/20.500.11815/2732

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Citation:

Cubuk-Sabuncu , Y , Jónsdóttir , K , Caudron , C , Lecocq , T , Parks , M M , Geirsson , H & Mordret , A 2021 , ' Temporal Seismic Velocity Changes During the 2020 Rapid Inflation at Mt. Þorbjörn-Svartsengi, Iceland, Using Seismic Ambient Noise ' , Geophysical Research Letters , vol. 48 , no. 11 , e2020GL092265 . https://doi.org/10.1029/2020GL092265

Abstract:

Repeated periods of inflation-deflation in the vicinity of Mt. Þorbjörn-Svartsengi, SW-Iceland, were detected in January–July, 2020. We used seismic ambient noise and interferometry to characterize temporal variations of seismic velocities (dv/v, %). This is the first time in Iceland that dv/v variations are monitored in near real-time during volcanic unrest. The seismic station closest to the inflation source center (∼1 km) showed the largest velocity drop (∼1%). Different frequency range measurements, from 0.1 to 2 Hz, show dv/v variations, which we interpret in terms of varying depth sensitivity. The dv/v correlates with deformation measurements (GPS, InSAR), over the unrest period, indicating sensitivity to similar crustal processes. We interpret the velocity drop to be caused by crack opening triggered by intrusive magmatic activity. We conclude that single-station cross-component analyses provide the most robust solutions for early detection of magmatic activity.

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Publisher Copyright: © 2021. The Authors.

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