Abstract
The recurring mismatch between the magnitude of subduction earthquakes and related tsunamis hinders hazard assessment. A tsunami which accompanied the 2014.04.01 Mw 8.2 Iquique earthquake and attained ≤2.11m on the north Chilean coast is generally attributed to slip at a depth of 23km on the megathrust between the Nazca and South American plates but, as at some other such sites, elastic seafloor deformation resulting from interplate displacements may have been supplemented if not overshadowed as the primary tsunamigenic agent by upper plate faulting. The evidence for suitable structures includes foreshocks M≤5.8 dating from the preceding month and, during the 24h immediately after the main shock, aftershocks M≤5.6.
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