Seismologically Observed Spatiotemporal Drainage Activity at Moulins
| العنوان: | Seismologically Observed Spatiotemporal Drainage Activity at Moulins |
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| المؤلفون: | Gwenn E. Flowers, Camilo Rada, Arran Whiteford, Victor C. Tsai, Christian Schoof, Naofumi Aso |
| المصدر: | Journal of Geophysical Research: Solid Earth. 122:9095-9108 |
| بيانات النشر: | American Geophysical Union (AGU), 2017. |
| سنة النشر: | 2017 |
| مصطلحات موضوعية: | geography, geography.geographical_feature_category, 010504 meteorology & atmospheric sciences, Water flow, Ambient noise level, Geophone, Glacier, 010502 geochemistry & geophysics, 01 natural sciences, Geophysics, Hydrology (agriculture), Space and Planetary Science, Geochemistry and Petrology, Passive seismic, Earth and Planetary Sciences (miscellaneous), Meltwater, Geomorphology, Geology, Noise (radio), 0105 earth and related environmental sciences |
| الوصف: | Hydrology is important for glacier dynamics, but it is difficult to monitor the subsurface drainage systems of glaciers by direct observations. Since meltwater drainage generates seismic signals, passive seismic analysis has the potential to be used to monitor these processes. To study continuous seismic radiation from the drainage, we analyze geophone data from six stations deployed at the Kaskawulsh Glacier in Yukon, Canada, during the summer of 2014 using ambient noise cross-correlation techniques. We locate the noise sources by back-projecting the amplitude of the cross-correlation to the glacier surface. Most of the ambient noise sequences are found in two clusters, with each cluster located in the vicinity of a moulin identified at the surface. Stronger seismic radiation is observed during the day, consistent with expected variability in melt rates. We demonstrate that the sparse seismic network array with 2-km station separation has the ability to detect moulins within the array with a precision of 50 m. We confirm that seismic activity is correlated with air temperature, and thus melt, on a diurnal timescale, and precipitation correlates with the activity at longer timescales. Our results highlight the potential of passive seismic observations for monitoring water flow into subglacial channels through moulins with an affordable number of seismic stations, but quantification of water flow rates still remains a challenge. The cross-correlation back-projection technique described here can also potentially be applied to any localized source of ambient noise such as ocean noise, tectonic tremor, and volcanic tremor. |
| وصف الملف: | application/pdf; application/zip |
| تدمد: | 2169-9356 2169-9313 |
| DOI: | 10.1002/2017jb014578 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c32a66b2bea008eedb7375d2d5ea44c2 https://doi.org/10.1002/2017jb014578 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....c32a66b2bea008eedb7375d2d5ea44c2 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 21699356 21699313 |
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| DOI: | 10.1002/2017jb014578 |