[J01-1] Monitoring of the cryosphere I

[J01-1-04] Complex Behavior of Glacial Earthquakes Reveal Subglacial Conditions

^○J. Paul Winberry¹, Audrey Huerta¹, Richard Aster², Howard Conway³, Michelle Koutnik³, Sridhar Anandakrishnan⁴, Andrew Nyblade⁴, Douglas Wiens⁵ (1.Central Washington University, 2.Colorado State University, 3.University of Washington, 4.Pennsylvania State University, 5.Washington University in Saint Louis)

Sticky-spots, enhanced regions of basal friction, exert fundamental control on the behavior of glaciers and ice sheets. Seismic energy released during stick-slip behavior associated with sticky-spots provides a window into the subglacial environment. Using new seismograph deployments in the Transantarctic Mountains, we report on 2 new families of repeating magnitude 2 glacial-earthquakes located close to one-another. For the first time, we show that repeating glacier events can be long-lived (> 6 years). Further analysis reveals that these closely spaced events interact with one-another, producing complex behaviors. However, relatively simple models can be used to simulate this behavior, offering insight into subglacial conditions.