Permanent, seasonal, and episodic seismic sources around Vatnajökull, Iceland from the analysis of correlograms

• Published in: Volcanica
• Main Authors: Sylvain Nowé, Thomas Lecocq, Corentin Caudron, Kristín Jónsdóttir, Frank Pattyn
• Format: Article in Journal/Newspaper
• Language: English
• Published: Volcanica 2021
• Subjects: seismic noise; correlograms; seismic interferometry; vatnajökull icecap; seasonal seismicity; Geology; QE1-996.5; Vatnajökull; Iceland
• Online Access: https://doi.org/10.30909/vol.04.02.135147; https://doaj.org/article/433ba67e2d0c40a9a8d1f5053d915425

In this study, we locate and characterise the main seismic noise sources in the region of the Vatnajökull icecap (Iceland). Vatnajökull is the largest Icelandic icecap, covering several active volcanoes. The seismic context is very complex, with glacial and volcanic events occurring simultaneously and the classification between the two can become cumbersome. Using seismic interferometry on continuous seismic data (2011–2019), we calculate the propagation velocities and locate the main seismic sources by using hyperbolicas geometry and a grid-search method. We identify and characterise permanent oceanic sources, seasonal glacial-related sources, and episodic volcanic sources. These results give a better understanding of the background seismic noise sources in this region and could allow the identification of seismic sources associated with potentially threatening events in real-time.