Great earthquakes along the western, subduction zone boundary of the Andes Mountains in South America are expected. Measurements of surface motion along the eastern boundary highlight the potential for equally large earthquakes in the east.
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McQuarrie, N. Unexpected Andean earthquakes. Nature Geosci 4, 357–358 (2011). https://doi.org/10.1038/ngeo1167
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DOI: https://doi.org/10.1038/ngeo1167