Glacial Earthquakes

We have detected dozens of previously unknown, moderate earthquakes beneath large glaciers. The seismic radiation from these earthquakes is depleted at high frequencies, explaining their nondetection by traditional methods. Inverse modeling of the long-period seismic waveforms from the best-recorded...

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Bibliographic Details
Published in:Science
Main Authors: Ekström, Göran, Nettles, Meredith, Abers, Geoffrey A.
Format: Article in Journal/Newspaper
Language:English
Published: American Association for the Advancement of Science (AAAS) 2003
Subjects:
glaciers
Alaska
Online Access:http://dx.doi.org/10.1126/science.1088057
https://www.science.org/doi/pdf/10.1126/science.1088057
id craaas:10.1126/science.1088057
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spelling craaas:10.1126/science.1088057 2024-09-15T18:08:02+00:00 Glacial Earthquakes Ekström, Göran Nettles, Meredith Abers, Geoffrey A. 2003 http://dx.doi.org/10.1126/science.1088057 https://www.science.org/doi/pdf/10.1126/science.1088057 en eng American Association for the Advancement of Science (AAAS) Science volume 302, issue 5645, page 622-624 ISSN 0036-8075 1095-9203 journal-article 2003 craaas https://doi.org/10.1126/science.1088057 2024-08-29T04:00:58Z We have detected dozens of previously unknown, moderate earthquakes beneath large glaciers. The seismic radiation from these earthquakes is depleted at high frequencies, explaining their nondetection by traditional methods. Inverse modeling of the long-period seismic waveforms from the best-recorded earthquake, in southern Alaska, shows that the seismic source is well represented by stick-slip, downhill sliding of a glacial ice mass. The duration of sliding in the Alaska earthquake is 30 to 60 seconds, about 15 to 30 times longer than for a regular tectonic earthquake of similar magnitude. Article in Journal/Newspaper glaciers Alaska AAAS Resource Center (American Association for the Advancement of Science) Science 302 5645 622 624
institution Open Polar
collection AAAS Resource Center (American Association for the Advancement of Science)
op_collection_id craaas
language English
description We have detected dozens of previously unknown, moderate earthquakes beneath large glaciers. The seismic radiation from these earthquakes is depleted at high frequencies, explaining their nondetection by traditional methods. Inverse modeling of the long-period seismic waveforms from the best-recorded earthquake, in southern Alaska, shows that the seismic source is well represented by stick-slip, downhill sliding of a glacial ice mass. The duration of sliding in the Alaska earthquake is 30 to 60 seconds, about 15 to 30 times longer than for a regular tectonic earthquake of similar magnitude.
format Article in Journal/Newspaper
author Ekström, Göran
Nettles, Meredith
Abers, Geoffrey A.
spellingShingle Ekström, Göran
Nettles, Meredith
Abers, Geoffrey A.
Glacial Earthquakes
author_facet Ekström, Göran
Nettles, Meredith
Abers, Geoffrey A.
author_sort Ekström, Göran
title Glacial Earthquakes
title_short Glacial Earthquakes
title_full Glacial Earthquakes
title_fullStr Glacial Earthquakes
title_full_unstemmed Glacial Earthquakes
title_sort glacial earthquakes
publisher American Association for the Advancement of Science (AAAS)
publishDate 2003
url http://dx.doi.org/10.1126/science.1088057
https://www.science.org/doi/pdf/10.1126/science.1088057
genre glaciers
Alaska
genre_facet glaciers
Alaska
op_source Science
volume 302, issue 5645, page 622-624
ISSN 0036-8075 1095-9203
op_doi https://doi.org/10.1126/science.1088057
container_title Science
container_volume 302
container_issue 5645
container_start_page 622
op_container_end_page 624
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