Opin vísindi

Single-Station Seismo-Acoustic Monitoring of Nyiragongo's Lava Lake Activity (D.R. Congo)

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dc.contributor Háskóli Íslands (HÍ)
dc.contributor University of Iceland (UI)
dc.contributor.author Barrière, Julien
dc.contributor.author d'Oreye, Nicolas
dc.contributor.author Oth, Adrien
dc.contributor.author Geirsson, Halldor
dc.contributor.author Mashagiro, Niche
dc.contributor.author Johnson, Jeffrey B.
dc.contributor.author Smets, Benoît
dc.contributor.author Samsonov, Sergey
dc.contributor.author Kervyn, François
dc.date.accessioned 2020-01-27T14:19:18Z
dc.date.available 2020-01-27T14:19:18Z
dc.date.issued 2018-06-19
dc.identifier.citation Barrière J, d’Oreye N, Oth A, Geirsson H, Mashagiro N, Johnson JB, Smets B, Samsonov S and Kervyn F (2018) Single-Station Seismo-Acoustic Monitoring of Nyiragongo’s Lava Lake Activity (D.R. Congo). Front. Earth Sci. 6:82. doi: 10.3389/feart.2018.00082
dc.identifier.issn 2296-6463
dc.identifier.uri https://hdl.handle.net/20.500.11815/1475
dc.description Publisher's version (útgefin grein).
dc.description.abstract Since its last effusive eruption in 2002, Nyiragongo has been an open-vent volcano characterized by the world’s largest persistent lava lake. This lava lake provides a unique opportunity to detect pressure change in the magmatic system by analyzing its level fluctuations. We demonstrate that this information is contained in the seismic and infrasound signals generated by the lava lake’s activity. The continuous seismo-acoustic monitoring permits quantification of lava lake dynamics, which is analyzed retrospectively to identify periods of volcanic unrest. Synchronous, high-resolution satellite SAR (Synthetic Aperture Radar) images are used to constrain lava lake level by measuring the length of the SAR shadow cast by the rim of the pit crater where the lava lake is located. Seventy-two estimations of the lava lake level were obtained with this technique between August 2016 and November 2017. These sporadic measurements allow for a better interpretation of the continuous infrasound and seismic data recorded at the closest station (∼6km from the crater). Jointly analyzed seismo-acoustic and SAR data reveal that slight changes in the spectral properties of the continuous cross-correlated low-frequency seismo-acoustic records (and not solely single events) can be used to track fluctuations of the lava lake level on a daily and hourly basis. We observe that drops of the lava lake and the appearance of significant long period (LP) “lava lake” events are a consequence of a probable deep lateral magma intrusion beneath Nyiragongo, which induces changes in its shallow plumbing system. In addition to contributing to understanding lava lake dynamics, this study highlights the potential to continuously monitor pressure fluctuations within the magmatic systemusing a single seismo-acoustic station located several kilometers from the vent.
dc.description.sponsorship The authors thank Robin Matoza and David Fee for their constructive reviews, which helped to improve the original manuscript, and Valerio Acocella for his final helpful comments on this work. This article is a contribution in the framework of the project Remote Sensing and In Situ Detection and Tracking of Geohazards (RESIST, http://resist.africamuseum.be), funded by the Belgian Science Policy (Belspo), Belgium, and the Fonds National de la Recherche (FNR), Luxembourg. We are grateful to Belspo for funding CosmoSkyMed images (Italian Space Agency) and to Natural Resources Canada (NRCan) for sharing RADARSAT images (Canadian Space Agency). We also wish to thank the Congolese Institute for Nature Preservation (ICCN) and the MONUSCO (UN stabilization mission in Congo) for their continuous support and allowing us to host the stations in their compounds, as well as the entire Goma Volcano Observatory team and the sentinels of the stations, without whom the operation of the seismic network would be impossible. KivuSNet data are underlying an embargo policy following the conditions of the Memoranda of Understanding between the partner institutions of RESIST. Beyond this embargo policy, data may be shared for collaboration purposes upon request with the approval of all RESIST partners. Data archiving and accessibility is ensured through the GEOFON program of the GFZ German Research Centre for Geosciences (http://dx.doi.org/doi:10.14470/XI058335) and KivuSNet is registered within the FDSN with network code KV (http://www.fdsn.org/networks/detail/KV/).
dc.format.extent 82
dc.language.iso en
dc.publisher Frontiers Media SA
dc.relation.ispartofseries Frontiers in Earth Science;6
dc.rights info:eu-repo/semantics/openAccess
dc.subject Infrasound
dc.subject Lava lake
dc.subject Nyiragongo
dc.subject Seismic
dc.subject Single-station monitoring
dc.subject Synthetic aperture radar
dc.subject Jarðskjálftar
dc.subject Jarðskjálftamælingar
dc.subject Hraun
dc.title Single-Station Seismo-Acoustic Monitoring of Nyiragongo's Lava Lake Activity (D.R. Congo)
dc.type info:eu-repo/semantics/article
dcterms.license This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
dc.description.version Peer Reviewed
dc.identifier.journal Frontiers in Earth Science
dc.identifier.doi 10.3389/feart.2018.00082
dc.relation.url https://www.frontiersin.org/article/10.3389/feart.2018.00082/full
dc.contributor.school School of Engineering and Natural Sciences (UI)
dc.contributor.school Verkfræði- og náttúruvísindasvið (HÍ)

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