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Data Processing Methods for 3D Seismic Imaging of Subsurface Volcanoes: Applications to the Tarim Flood Basalt

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Observing the subglacial hydrology network and its dynamics with a dense seismic array.

Ugo Nanni¹, Florent Gimbert², Philippe Roux³

¹Institut des Géosciences de l'Environnement, Université Grenoble Alpes, Centre National de la Recherche Scientifique, Institut de Recherche pour le Développement, Grenoble 38400, France; ugo.nanni@univ-grenoble-alpes.fr.

Proceedings of the National Academy of Sciences of the United States of America

|July 14, 2021

Summary

Understanding subglacial water flow is key to predicting sea level rise. This study maps subglacial drainage systems, revealing how water cavities enhance glacier flow and channels impede it, improving climate change impact assessments.

Keywords:

cryoseismology dense seismic array glacier seismic noise subglacial hydrology

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Area of Science:

Glaciology
Earth Science
Seismology

Background:

Subglacial water flow significantly impacts glacier basal motion and thus sea level rise contributions.
Direct observations of subglacial drainage are scarce, limiting our understanding of its influence on glacier dynamics.

Purpose of the Study:

To develop and apply a novel seismic technique for mapping subglacial drainage systems.
To investigate the relationship between drainage characteristics and glacier basal motion.

Main Methods:

Utilized dense seismic array observations.
Implemented an innovative systematic seismic source location technique to map drainage systems.
Monitored the day-to-day temporal evolution of subglacial drainage.

Main Results:

Generated a two-dimensional map of a subglacial drainage system with unprecedented detail.
Differentiated between cavity-like systems that enhance glacier flow and channel-like systems that impede it.
Identified regions of high hydraulic connectivity crucial for glacier response to warming.

Conclusions:

Seismic monitoring offers a powerful tool for observing subglacial hydrology and its impact on glacier flow.
Understanding drainage system evolution is critical for predicting glacier and ice sheet behavior under climate change.
This methodology can be applied to ice sheets to assess their vulnerability to increased meltwater.