Seismic observations of transient subglacial water-flow beneath MacAyeal Ice Stream, West Antarctica
New seismic observations of harmonic tremors beneath MacAyeal Ice Stream, West Antarctica are reported. Each of the two tremor events that we recorded during a six week period had sustained arrival of 3 Hz energy for approximately 10 minutes. During that time the source location migrated a few kilom...
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ftcwashingtonuni:oai:digitalcommons.cwu.edu:cotsfac-1204 2023-05-15T13:47:32+02:00 Seismic observations of transient subglacial water-flow beneath MacAyeal Ice Stream, West Antarctica Winberry, J. Paul Anandakrishnan, Sridhar Alley, Richard B. 2009-06-12T07:00:00Z application/pdf https://digitalcommons.cwu.edu/cotsfac/204 https://digitalcommons.cwu.edu/cgi/viewcontent.cgi?article=1204&context=cotsfac unknown ScholarWorks@CWU https://digitalcommons.cwu.edu/cotsfac/204 https://digitalcommons.cwu.edu/cgi/viewcontent.cgi?article=1204&context=cotsfac Copyright 2009 by the American Geophysical Union. All Faculty Scholarship for the College of the Sciences ice stream Antarctica tremors earthquakes glaciology Geology Geophysics and Seismology text 2009 ftcwashingtonuni 2022-10-20T20:29:02Z New seismic observations of harmonic tremors beneath MacAyeal Ice Stream, West Antarctica are reported. Each of the two tremor events that we recorded during a six week period had sustained arrival of 3 Hz energy for approximately 10 minutes. During that time the source location migrated a few kilometers. The harmonic nature of the tremors is interpreted as the result of resonance in subglacial water-filled cracks and conduits. The duration, monochromatic nature, and movement of the tremor indicate that the source mechanism is likely flow in the subglacial water system resulting from the discharge from a small subglacial lake. Our results suggest that the subglacial water system produces repeated, small outburst floods, with possible implications for ice-stream dynamics. Text Antarc* Antarctica MacAyeal Ice Stream West Antarctica Central Washington University: ScholarWorks MacAyeal Ice Stream ENVELOPE(-143.000,-143.000,-80.000,-80.000) West Antarctica |
institution |
Open Polar |
collection |
Central Washington University: ScholarWorks |
op_collection_id |
ftcwashingtonuni |
language |
unknown |
topic |
ice stream Antarctica tremors earthquakes glaciology Geology Geophysics and Seismology |
spellingShingle |
ice stream Antarctica tremors earthquakes glaciology Geology Geophysics and Seismology Winberry, J. Paul Anandakrishnan, Sridhar Alley, Richard B. Seismic observations of transient subglacial water-flow beneath MacAyeal Ice Stream, West Antarctica |
topic_facet |
ice stream Antarctica tremors earthquakes glaciology Geology Geophysics and Seismology |
description |
New seismic observations of harmonic tremors beneath MacAyeal Ice Stream, West Antarctica are reported. Each of the two tremor events that we recorded during a six week period had sustained arrival of 3 Hz energy for approximately 10 minutes. During that time the source location migrated a few kilometers. The harmonic nature of the tremors is interpreted as the result of resonance in subglacial water-filled cracks and conduits. The duration, monochromatic nature, and movement of the tremor indicate that the source mechanism is likely flow in the subglacial water system resulting from the discharge from a small subglacial lake. Our results suggest that the subglacial water system produces repeated, small outburst floods, with possible implications for ice-stream dynamics. |
format |
Text |
author |
Winberry, J. Paul Anandakrishnan, Sridhar Alley, Richard B. |
author_facet |
Winberry, J. Paul Anandakrishnan, Sridhar Alley, Richard B. |
author_sort |
Winberry, J. Paul |
title |
Seismic observations of transient subglacial water-flow beneath MacAyeal Ice Stream, West Antarctica |
title_short |
Seismic observations of transient subglacial water-flow beneath MacAyeal Ice Stream, West Antarctica |
title_full |
Seismic observations of transient subglacial water-flow beneath MacAyeal Ice Stream, West Antarctica |
title_fullStr |
Seismic observations of transient subglacial water-flow beneath MacAyeal Ice Stream, West Antarctica |
title_full_unstemmed |
Seismic observations of transient subglacial water-flow beneath MacAyeal Ice Stream, West Antarctica |
title_sort |
seismic observations of transient subglacial water-flow beneath macayeal ice stream, west antarctica |
publisher |
ScholarWorks@CWU |
publishDate |
2009 |
url |
https://digitalcommons.cwu.edu/cotsfac/204 https://digitalcommons.cwu.edu/cgi/viewcontent.cgi?article=1204&context=cotsfac |
long_lat |
ENVELOPE(-143.000,-143.000,-80.000,-80.000) |
geographic |
MacAyeal Ice Stream West Antarctica |
geographic_facet |
MacAyeal Ice Stream West Antarctica |
genre |
Antarc* Antarctica MacAyeal Ice Stream West Antarctica |
genre_facet |
Antarc* Antarctica MacAyeal Ice Stream West Antarctica |
op_source |
All Faculty Scholarship for the College of the Sciences |
op_relation |
https://digitalcommons.cwu.edu/cotsfac/204 https://digitalcommons.cwu.edu/cgi/viewcontent.cgi?article=1204&context=cotsfac |
op_rights |
Copyright 2009 by the American Geophysical Union. |
_version_ |
1766247270709198848 |