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1. Remote Triggering of Icequakes at Mt. Erebus, Antarctica by Large Teleseismic Earthquakes

   https://doi.org/10.1785/0220210027  

   Li, Chenyu ; Peng, Zhigang ; Chaput, Julien A. ; Walter, Jacob I. ; Aster, Richard C. ( May 2021 , Seismological Research Letters)

   Abstract Recent studies have shown that the Antarctic cryosphere is sensitive to external disturbances such as tidal stresses or dynamic stresses from remote large earthquakes. In this study, we systematically examine evidence of remotely triggered microseismicity around Mount (Mt.) Erebus, an active high elevation stratovolcano located on Ross Island, Antarctica. We detect microearthquakes recorded by multiple stations from the Mt. Erebus Volcano Observatory Seismic Network one day before and after 43 large teleseismic earthquakes, and find that seven large earthquakes (including the 2010 Mw 8.8 Maule, Chile, and 2012 Mw 8.6 Indian Ocean events) triggered local seismicity on the volcano, with most triggered events occurring during the passage of the shorter-period Rayleigh waves. In addition, their waveforms and locations for the triggered events are different when comparing with seismic events arising from the persistent small-scale eruptions, but similar to other detected events before and after the mainshocks. Based on the waveform characteristics and their locations, we infer that these triggered events are likely shallow icequakes triggered by dilatational stress perturbations from teleseismic surface waves. We show that teleseismic earthquakes with higher peak dynamic stress changes are more capable of triggering icequakes at Mt. Erebus. We also find that the icequakes in thismore »study are more likely to be triggered during the austral summer months. Our study motivates the continued monitoring of Mount Erebus with dense seismic instrumentation to better understand interactions between dynamic seismic triggering, crospheric processes, and volcanic activity.« less
2. Projected Seismic Activity at the Tiger Stripe Fractures on Enceladus, Saturn, From an Analog Study of Tidally Modulated Icequakes Within the Ross Ice Shelf, Antarctica

   https://doi.org/10.1029/2021JE006862  

   Olsen, Kira G. ; Hurford, Terry A. ; Schmerr, Nicholas C. ; Huang, Mong‐Han ; Brunt, Kelly M. ; Zipparo, Sophia ; Cole, Hank M. ; Aster, Richard C. ( June 2021 , Journal of Geophysical Research: Planets)
3. Ross Ice Shelf Icequakes Associated With Ocean Gravity Wave Activity

   https://doi.org/10.1029/2019GL084123  

   Chen, Z. ; Bromirski, P. D. ; Gerstoft, P. ; Stephen, R. A. ; Lee, W. S. ; Yun, S. ; Olinger, S. D. ; Aster, R. C. ; Wiens, D. A. ; Nyblade, A. A. ( August 2019 , Geophysical Research Letters)