Swiss PhD Student from the University of Tokyo co-publishes article in seismology

Mr. Anselme Borgeaud

Mr. Anselme Borgeaud, a Swiss student who received his undergraduate degree in physics at EPFL and is now doing a PhD in seismology at the University of Tokyo, co-authored a research paper in Science Advances, a renowned scientific open-access journal, together with Japanese and American researchers.

The research paper addresses the discovery of two distinct paleoslabs beneath Central America and the Caribbean.

Below is a short summary of the paper:

UTokyo seismologists mapped the 3-D seismic velocity structure deep beneath Central America and the Caribbean using a new “big data” technique that fully extracts all the information in a large dataset of recorded seismograms with better resolving power than previously possible. The new technique, called “waveform inversion,” systematically finds the 3-D Earth model for which the calculated seismograms best fit the observed data.

Geologists have long known that the Farallon plate subducted beneath the western margin of South and North America about 180 million years ago (Ma), but until now haven’t known in detail what happened when it reached the bottom of the mantle. The UTokyo team used waveforms of deep South-American earthquakes recorded from 2004-2015 by the USArray, a transportable seismic array that fully covered the conterminous U.S. Their imaging revealed two distinct remnants of paleoslabs, at the base of the mantle beneath Central America and Venezuela, respectively, surrounded by hotter-than-average and possibly iron-enriched material.

You can find the article on the Science Advances journal website.

Congratulations to the researchers for the publication !

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