Monitoring glacier surface seismicity in time and space using Rayleigh waves
International audience Sliding glaciers and brittle ice failure generate seismic body and surface wave energy characteristic to the source mechanism. Here we analyze continuous seismic recordings from an array of nine short-period passive seismometers located on Bench Glacier, Alaska (USA) (61.033°N...
Published in: | Journal of Geophysical Research: Earth Surface |
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Format: | Article in Journal/Newspaper |
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Online Access: | https://hal.science/hal-00716454 https://hal.science/hal-00716454/document https://hal.science/hal-00716454/file/2011JF002259.pdf https://doi.org/10.1029/2011JF002259 |
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ftsorbonneuniv:oai:HAL:hal-00716454v1 2023-12-17T10:30:28+01:00 Monitoring glacier surface seismicity in time and space using Rayleigh waves Mikesell, T.D. van Wijk, K. Haney, M. Bradford, J.H Marshall, H.P. Harper, J.T. Center for Geophysical Investigation of the Shallow Subsurface (CGISS) Boise State University Géoazur (GEOAZUR 6526) Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Nice Sophia Antipolis (1965 - 2019) (UNS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS) Department of Geosciences Missoula University of Montana 2012-05-10 https://hal.science/hal-00716454 https://hal.science/hal-00716454/document https://hal.science/hal-00716454/file/2011JF002259.pdf https://doi.org/10.1029/2011JF002259 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2011JF002259 hal-00716454 https://hal.science/hal-00716454 https://hal.science/hal-00716454/document https://hal.science/hal-00716454/file/2011JF002259.pdf doi:10.1029/2011JF002259 http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess ISSN: 0148-0227 EISSN: 2156-2202 Journal of Geophysical Research https://hal.science/hal-00716454 Journal of Geophysical Research, 2012, 117, pp.F02020. ⟨10.1029/2011JF002259⟩ [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2012 ftsorbonneuniv https://doi.org/10.1029/2011JF002259 2023-11-21T23:46:21Z International audience Sliding glaciers and brittle ice failure generate seismic body and surface wave energy characteristic to the source mechanism. Here we analyze continuous seismic recordings from an array of nine short-period passive seismometers located on Bench Glacier, Alaska (USA) (61.033°N, 145.687°W). We focus on the arrival-time and amplitude information of the dominant Rayleigh wave phase. Over a 46-hour period we detect thousands of events using a cross-correlation based event identification method. Travel-time inversion of a subset of events (7% of the total) defines an active crevasse, propagating more than 200 meters in three hours. From the Rayleigh wave amplitudes, we estimate the amount of volumetric opening along the crevasse as well as an average bulk attenuation ( Q ¯ = 42) for the ice in this part of the glacier. With the remaining icequake signals we establish a diurnal periodicity in seismicity, indicating that surface run-off and subglacial water pressure changes likely control the triggering of these surface events. Furthermore, we find that these events are too weak (i.e., too noisy) to locate individually. However, stacking individual events increases the signal-to-noise ratio of the waveforms, implying that these periodic sources are effectively stationary during the recording period Article in Journal/Newspaper glacier glaciers Alaska HAL Sorbonne Université Journal of Geophysical Research: Earth Surface 117 F2 n/a n/a |
institution |
Open Polar |
collection |
HAL Sorbonne Université |
op_collection_id |
ftsorbonneuniv |
language |
English |
topic |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences Mikesell, T.D. van Wijk, K. Haney, M. Bradford, J.H Marshall, H.P. Harper, J.T. Monitoring glacier surface seismicity in time and space using Rayleigh waves |
topic_facet |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Sliding glaciers and brittle ice failure generate seismic body and surface wave energy characteristic to the source mechanism. Here we analyze continuous seismic recordings from an array of nine short-period passive seismometers located on Bench Glacier, Alaska (USA) (61.033°N, 145.687°W). We focus on the arrival-time and amplitude information of the dominant Rayleigh wave phase. Over a 46-hour period we detect thousands of events using a cross-correlation based event identification method. Travel-time inversion of a subset of events (7% of the total) defines an active crevasse, propagating more than 200 meters in three hours. From the Rayleigh wave amplitudes, we estimate the amount of volumetric opening along the crevasse as well as an average bulk attenuation ( Q ¯ = 42) for the ice in this part of the glacier. With the remaining icequake signals we establish a diurnal periodicity in seismicity, indicating that surface run-off and subglacial water pressure changes likely control the triggering of these surface events. Furthermore, we find that these events are too weak (i.e., too noisy) to locate individually. However, stacking individual events increases the signal-to-noise ratio of the waveforms, implying that these periodic sources are effectively stationary during the recording period |
author2 |
Center for Geophysical Investigation of the Shallow Subsurface (CGISS) Boise State University Géoazur (GEOAZUR 6526) Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Nice Sophia Antipolis (1965 - 2019) (UNS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS) Department of Geosciences Missoula University of Montana |
format |
Article in Journal/Newspaper |
author |
Mikesell, T.D. van Wijk, K. Haney, M. Bradford, J.H Marshall, H.P. Harper, J.T. |
author_facet |
Mikesell, T.D. van Wijk, K. Haney, M. Bradford, J.H Marshall, H.P. Harper, J.T. |
author_sort |
Mikesell, T.D. |
title |
Monitoring glacier surface seismicity in time and space using Rayleigh waves |
title_short |
Monitoring glacier surface seismicity in time and space using Rayleigh waves |
title_full |
Monitoring glacier surface seismicity in time and space using Rayleigh waves |
title_fullStr |
Monitoring glacier surface seismicity in time and space using Rayleigh waves |
title_full_unstemmed |
Monitoring glacier surface seismicity in time and space using Rayleigh waves |
title_sort |
monitoring glacier surface seismicity in time and space using rayleigh waves |
publisher |
HAL CCSD |
publishDate |
2012 |
url |
https://hal.science/hal-00716454 https://hal.science/hal-00716454/document https://hal.science/hal-00716454/file/2011JF002259.pdf https://doi.org/10.1029/2011JF002259 |
genre |
glacier glaciers Alaska |
genre_facet |
glacier glaciers Alaska |
op_source |
ISSN: 0148-0227 EISSN: 2156-2202 Journal of Geophysical Research https://hal.science/hal-00716454 Journal of Geophysical Research, 2012, 117, pp.F02020. ⟨10.1029/2011JF002259⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2011JF002259 hal-00716454 https://hal.science/hal-00716454 https://hal.science/hal-00716454/document https://hal.science/hal-00716454/file/2011JF002259.pdf doi:10.1029/2011JF002259 |
op_rights |
http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2011JF002259 |
container_title |
Journal of Geophysical Research: Earth Surface |
container_volume |
117 |
container_issue |
F2 |
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n/a |
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n/a |
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1785583445932507136 |