Motion of an Antarctic glacier by repeated tidally modulated earthquakes

Nature Geoscience

Volumn 5, Issue 9, 2012, Pages 623-626

  Zoet, Lucas K ^a   Anandakrishnan, Sridhar ^a   Alley, Richard B ^a   Nyblade, Andrew A ^a   Wiens, Douglas A ^b  

^a PENNSYLVANIA STATE UNIVERSITY   (United States)

^b WASHINGTON UNIVERSITY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

BEDROCK; CREVASSE; GLACIAL EROSION; ICE FLOW; OUTBURST; SEISMICITY; STICK-SLIP; SUBGLACIAL ENVIRONMENT; TILL;

ANTARCTICA; EAST ANTARCTICA; ROSS SEA; SOUTHERN OCEAN; TRANSANTARCTIC MOUNTAINS;

EID: 84865794381     PISSN: 17520894     EISSN: 17520908     Source Type: Journal    
DOI: 10.1038/ngeo1555     Document Type: Article

References (30)

1. Smith, A. M. Microearthquakes and subglacial conditions. Geophys. Res. Lett. 33, L24501 (2006).
2. Walker, R. T., Christianson, K., Parizek, B. R., Anandakrishnan, S. & Alley, R. B. A viscoelastic flowline model applied to tidal forcing of Bindschadler Ice Stream, West Antarctica. Earth Planet. Sci. Lett. 319-320, 128-132 (2012).
3. Anandakrishnan, S. & Bentley, C. Micro-earthquakes beneath Ice Streams B and C, West Antarctica: Observations and implications. J. Glaciol. 39, 455-462 (1993). (Pubitemid 24401974)
4. Winberry, J. P., Anandakrishnan, S. & Alley, R. B. Seismic observations of transient subglacial water-flow beneath MacAyeal Ice Stream, West Antarctica. J. Geophys. Res. 36, 1-5 (2009).
5. Ekstrom, G., Nettles, M. & Tsai, V. Seasonality and increasing frequency of Greenland glacial earthquakes. Science 311, 1756-1758 (2006).
6. Tsai, V., Rice, J. R. & Fahnestock, M. Possible mechanism for glacial earthquakes. J. Geophys. Res. 113, 1-17 (2008).
7. O'Neel, S., Larsen, C. F., Rupert, N. & Hansen, R. Iceberg calving as a primary source of regional-scale glacier-generated seismicity in the St. Elias Mountains, Alaska. J. Geophys. Res. 115, F04034 (2010).
8. Bindschadler, R., Stephenson, S., MacAyeal, D. & Shabtaie, S. Ice dynamics at the mouth of Ice Stream B, Antarctica. J. Geophys. Res. 92, 8885-8894 (1987).
9. Winberry, J. P. et al. Basal mechanics of ice steams: Insights from the stick-slip motion of Whillans Ice Stream, West Antarctica. J. Geophys. Res. 114, 1-11 (2009).
10. Rignot, E. Mass balance of East Antarctic glaciers and ice shelves from satellite data. Ann. Glaciol. 34, 217-227 (2002). (Pubitemid 34866115)
11. Frezzotti, M., Capra, A. & Vittuari, L. Comparison between glacier ice velocities inferred from GPS and sequential satellite images. Ann. Glaciol. 27, 54-60 (1998). (Pubitemid 29199010)
12. Frezzotti, M., Tabacco, I. & Zirizzotti, A. Ice discharge of eastern Dome C drainage area, Antarctica, determined from airborne radar survey and satellite image analysis. J. Glaciol. 46, 253-264 (2000).
13. Watson, T. et al. P and S velocity structure of the upper mantle beneath the Transantarctic Mountains, East Antarctic craton, and Ross Sea from travel time tomography. Geochem. Geophys. Geosyst. 7, 1-17 (2006).
14. Lawrence, J. F. et al. Upper mantle thermal variations beneath the Transantarctic Mountains inferred from teleseismic S-wave attenuation. J. Geophys. Res. 33, 1-4 (2006).
15. Chen, Y. & Sammis, C. Asperity models for earthquakes. Bull. Seismol. Soc. Am. 93, 1792-1802 (2003). (Pubitemid 37332729)
16. Sagy, A. & Brodsky, E. E. Geometric and rheological asperities in an exposed fault zone. J. Geophys. Res. 114, B02301 (2009).
17. Anandakrishnan, S. & Alley, R. B. Tidal forcing of basal seismicity of ice stream C, West Antarctica, observed far inland. J. Geophys. Res. 102, 15183-1596 (1997).
18. Anandakrishnan, S., Voigt, D. E., Alley, R. B. & King, M. A. Ice stream D flow speed is strongly modulated by the tide beneath the Ross Ice Shelf. J. Geophys. Res. 30, 1-4 (2003).
19. Bamber, J. L. & Bindschandler, R. A. An improved elevation dataset for climate and ice-sheet modeling: Validation with satellite imagery. Ann. Glaciol. 25, 438-444 (1997).
20. Danesi, S., Bannister, S. & Morelli, A. Repeating earthquakes from rupture of an asperity under an Antarctic outlet glacier. Earth Planet. Sci. Lett. 253, 151-158 (2007). (Pubitemid 44932863)
21. Pawlowicz, R., Beardsley, B. & Lentz, S. Classical tidal harmonic analysis including error estimates in MATLAB using T-TIDE. Comput. Geosci. 28, 929-937 (2002). (Pubitemid 34996026)
22. Brune, J. Tectonic stress and the spectra of seismic shear waves from earthquakes. J. Geophys. Res. 75, 4997-5009 (1970).
23. Walter, J. I., Brodsky, E. E., Tulaczyk, S., Schwartz, S. Y. & Pettersson, R. Transient slip events from near-field seismic and geodetic data on a glacier fault, Whillans Ice Plain, West Antarctica. J. Geophys. Res. 116, F01021 (2011).
24. Wiens, D. A., Anandakrishnan, S., Winberry, J. P. & King, M. A. Simultaneous teleseismic and geodetic observations of the stick-slip motion of an Antarctic ice stream. Nature 453, 770-774 (2008). (Pubitemid 351793784)
25. Hallet, B. A theoretical model of glacial abrasion. J. Glaciol. 23, 39-50 (1979).
26. Hallet, B. Glacial abrasion and sliding: Their dependence on the debris concentration in basal ice. Ann. Glaciol. 2, 23-28 (1981).
27. Iverson, N. et al. Soft-bed experiments beneath Engabreen, Norway: Regelation infiltration, basal slip and bed deformation. J. Glaciol. 53, 323-340 (2007).
28. Engelder, J. Microscopic wear grooves on slickensides: Indicators of paleoseismicity. J. Geophys. Res. 79, 4387-4392 (1974).
29. Iverson, N. Potential effects of subglacial water-pressure fluctuations on quarrying. J. Glaciol. 37, 27-36 (1991).
30. Hallet, B. Glacial quarrying: A simple rheoretical model. Ann. Glaciol. 22, 1-8 (1996). (Pubitemid 27144774)