The role of large bubbles detected from acoustic measurements on the dynamics of Erta 'Ale lava lake (Ethiopia)
International audience The activity at the surface of the lava lake on Erta 'Ale volcano (Ethiopia) shows that large bubbles are regularly breaking at a fixed position on the lava lake. This is also where the small lava fountains are sometimes produced. Since this location is likely to be direc...
Published in: | Earth and Planetary Science Letters |
---|---|
Main Authors: | , , , , , , , |
Other Authors: | , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2010
|
Subjects: | |
Online Access: | https://hal.science/hal-00537831 https://doi.org/10.1016/j.epsl.2010.03.020 |
id |
ftinsu:oai:HAL:hal-00537831v1 |
---|---|
record_format |
openpolar |
spelling |
ftinsu:oai:HAL:hal-00537831v1 2024-04-28T08:03:29+00:00 The role of large bubbles detected from acoustic measurements on the dynamics of Erta 'Ale lava lake (Ethiopia) Bouche, E. Vergniolle, S. Staudacher, T. Nercessian, A. Delmont, J.-C. Frogneux, M. Cartault, F. Le Pichon, A. Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) Biologie et écologie tropicale et méditerranéenne 2007-2010 (BETM) Université de Perpignan Via Domitia (UPVD)-École Pratique des Hautes Études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) Laboratoire de Détection et de Géophysique (CEA) (LDG) DAM Île-de-France (DAM/DIF) Direction des Applications Militaires (DAM) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction des Applications Militaires (DAM) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) 2010 https://hal.science/hal-00537831 https://doi.org/10.1016/j.epsl.2010.03.020 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2010.03.020 hal-00537831 https://hal.science/hal-00537831 doi:10.1016/j.epsl.2010.03.020 ISSN: 0012-821X Earth and Planetary Science Letters https://hal.science/hal-00537831 Earth and Planetary Science Letters, 2010, 295 (1-2), pp.37-48. ⟨10.1016/j.epsl.2010.03.020⟩ eruption dynamics volcano acoustics bubbles lava lake Erta 'Ale [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2010 ftinsu https://doi.org/10.1016/j.epsl.2010.03.020 2024-04-05T00:25:18Z International audience The activity at the surface of the lava lake on Erta 'Ale volcano (Ethiopia) shows that large bubbles are regularly breaking at a fixed position on the lava lake. This is also where the small lava fountains are sometimes produced. Since this location is likely to be directly above the volcanic conduit feeding the lava lake, we have done continuous measurements between March 22 and 26, 2003 to understand the degassing of a volcano in permanent activity. The bubble size has been first estimated from videos, which once combined with the acoustic pressure, can constrain the source of the sound. The gas volume and overpressure stayed roughly constant, between 36–700 m3 and 4 × 103–1.8 × 104 Pa, respectively. Simultaneous thermal measurements showed regular peaks, which occurred when the crust was broken by a large bubble, hence gave a direct indication on the typical return time between the bubbles (1 h). These spherical cap bubbles had a high Reynolds number, 4600–20000, therefore a wake, periodically unstable, formed and detached from the bubble bottom. The bubbly wake, if the detachment occurs close to the surface, can explain the duration of lava fountains, measured on the videos. The periodic arrival of bubbly wakes, which mostly detach from the driving spherical cap within the lava lake, could explain the absence of cooling at Erta 'Ale, Erebus (Antartica), Villarica (Chile) and Nyiragongo (Democratic Republic of Congo) without invoking a convective downflow of magma in the conduit, as previously done. Article in Journal/Newspaper antartic* Institut national des sciences de l'Univers: HAL-INSU Earth and Planetary Science Letters 295 1-2 37 48 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
eruption dynamics volcano acoustics bubbles lava lake Erta 'Ale [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
eruption dynamics volcano acoustics bubbles lava lake Erta 'Ale [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Bouche, E. Vergniolle, S. Staudacher, T. Nercessian, A. Delmont, J.-C. Frogneux, M. Cartault, F. Le Pichon, A. The role of large bubbles detected from acoustic measurements on the dynamics of Erta 'Ale lava lake (Ethiopia) |
topic_facet |
eruption dynamics volcano acoustics bubbles lava lake Erta 'Ale [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience The activity at the surface of the lava lake on Erta 'Ale volcano (Ethiopia) shows that large bubbles are regularly breaking at a fixed position on the lava lake. This is also where the small lava fountains are sometimes produced. Since this location is likely to be directly above the volcanic conduit feeding the lava lake, we have done continuous measurements between March 22 and 26, 2003 to understand the degassing of a volcano in permanent activity. The bubble size has been first estimated from videos, which once combined with the acoustic pressure, can constrain the source of the sound. The gas volume and overpressure stayed roughly constant, between 36–700 m3 and 4 × 103–1.8 × 104 Pa, respectively. Simultaneous thermal measurements showed regular peaks, which occurred when the crust was broken by a large bubble, hence gave a direct indication on the typical return time between the bubbles (1 h). These spherical cap bubbles had a high Reynolds number, 4600–20000, therefore a wake, periodically unstable, formed and detached from the bubble bottom. The bubbly wake, if the detachment occurs close to the surface, can explain the duration of lava fountains, measured on the videos. The periodic arrival of bubbly wakes, which mostly detach from the driving spherical cap within the lava lake, could explain the absence of cooling at Erta 'Ale, Erebus (Antartica), Villarica (Chile) and Nyiragongo (Democratic Republic of Congo) without invoking a convective downflow of magma in the conduit, as previously done. |
author2 |
Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) Biologie et écologie tropicale et méditerranéenne 2007-2010 (BETM) Université de Perpignan Via Domitia (UPVD)-École Pratique des Hautes Études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) Laboratoire de Détection et de Géophysique (CEA) (LDG) DAM Île-de-France (DAM/DIF) Direction des Applications Militaires (DAM) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction des Applications Militaires (DAM) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) |
format |
Article in Journal/Newspaper |
author |
Bouche, E. Vergniolle, S. Staudacher, T. Nercessian, A. Delmont, J.-C. Frogneux, M. Cartault, F. Le Pichon, A. |
author_facet |
Bouche, E. Vergniolle, S. Staudacher, T. Nercessian, A. Delmont, J.-C. Frogneux, M. Cartault, F. Le Pichon, A. |
author_sort |
Bouche, E. |
title |
The role of large bubbles detected from acoustic measurements on the dynamics of Erta 'Ale lava lake (Ethiopia) |
title_short |
The role of large bubbles detected from acoustic measurements on the dynamics of Erta 'Ale lava lake (Ethiopia) |
title_full |
The role of large bubbles detected from acoustic measurements on the dynamics of Erta 'Ale lava lake (Ethiopia) |
title_fullStr |
The role of large bubbles detected from acoustic measurements on the dynamics of Erta 'Ale lava lake (Ethiopia) |
title_full_unstemmed |
The role of large bubbles detected from acoustic measurements on the dynamics of Erta 'Ale lava lake (Ethiopia) |
title_sort |
role of large bubbles detected from acoustic measurements on the dynamics of erta 'ale lava lake (ethiopia) |
publisher |
HAL CCSD |
publishDate |
2010 |
url |
https://hal.science/hal-00537831 https://doi.org/10.1016/j.epsl.2010.03.020 |
genre |
antartic* |
genre_facet |
antartic* |
op_source |
ISSN: 0012-821X Earth and Planetary Science Letters https://hal.science/hal-00537831 Earth and Planetary Science Letters, 2010, 295 (1-2), pp.37-48. ⟨10.1016/j.epsl.2010.03.020⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2010.03.020 hal-00537831 https://hal.science/hal-00537831 doi:10.1016/j.epsl.2010.03.020 |
op_doi |
https://doi.org/10.1016/j.epsl.2010.03.020 |
container_title |
Earth and Planetary Science Letters |
container_volume |
295 |
container_issue |
1-2 |
container_start_page |
37 |
op_container_end_page |
48 |
_version_ |
1797574592420642816 |