Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 43, Issue 5, Pages 2036-2044Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016GL067743
Keywords
cryoseismicity; tide; strain rate; icequake; Greenland; calving front
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Funding
- JSPS [PU15901]
- SNF [200021_153179/1]
- Air Greenland
- Swiss National Science Foundation
- [GlaHMSeis ProjectPP00P2_157551]
- Grants-in-Aid for Scientific Research [26550001, 15F15901] Funding Source: KAKEN
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Glacier microseismicity is a promising tool to study glacier dynamics. However, physical processes connecting seismic signals and ice dynamics are not clearly understood at present. Particularly, the relationship between tide-modulated seismicity and dynamics of calving glaciers remains elusive. Here we analyze records from an on-ice seismometer placed 250m from the calving front of Bowdoin Glacier, Greenland. Using high-frequency glacier flow speed measurements, we show that the microseismic activity is related to strain rate variations. The seismic activity correlates with longitudinal stretching measured at the glacier surface. Both higher melt rates and falling tides accelerate glacier motion and increase longitudinal stretching. Long-term microseismic monitoring could therefore provide insights on how a calving glacier's force balance and flow regime react to changes at the ice-ocean interface.
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