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Journal Articles Geology Year : 2019

No large earthquakes in fully exposed subducted seamount

Abstract

Bathymetric highs on the ocean floor ultimately sink into highly seismic subduction zones, raising vigorous debates on their potential to trigger or arrest large earthquakes (Mw > 7.5). Many geophysical and seismological studies addressing this problem meet penetration and/or resolution issues and deal with only the most recent earthquakes. We herein present the missing piece of the puzzle with the time-integrated field and petrographic record of a unique, almost intact subducted seamount cropping out along a fossil subduction interface. We document seamount buildup and subduction down to ~30 km, and we show that this seamount did not behave as a large earthquake asperity and may have acted as a barrier.
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insu-03978986 , version 1 (08-02-2023)

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Guillaume Bonnet, Philippe Agard, Samuel Angiboust, Marc Fournier, J. Omrani. No large earthquakes in fully exposed subducted seamount. Geology, 2019, 47 (5), pp.407-410. ⟨10.1130/G45564.1⟩. ⟨insu-03978986⟩
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