@misc{10481/83951,
year = {2023},
month = {7},
url = {https://hdl.handle.net/10481/83951},
abstract = {We conduct a P-wave receiver function analysis of the Bransfield Strait (West Antarctica) to
determine the lithospheric structure of this back-arc basin, thanks to 31 temporary and permanent stations.
Our main finding is a 15 km tear of the Phoenix slab, coinciding with the location of the 2020–2021 Orca
earthquake swarm's epicenters. Teleseismic wave modeling reveals that the two major earthquakes occurred
at the base of the crust, suggesting that the swarm could have been triggered by active underplating driven by
mantle flow through the slab tear. There is evidence for such an underplating layer at least under Deception
Island and for a widespread low velocity zone in the mantle wedge probably undergoing partial melting. We
found average crustal thickness (30.5 ± 1.0 km) and Vp/Vs (1.81 ± 0.04) values close to average extended
continental crust, although results in the South Shetland Islands are significantly more heterogeneous than in
the Antarctic Peninsula.},
organization = {Spanish national
projects PID2019-109608GB-100/
SRA/10.13039/501100011033},
organization = {CMT2016-77315-R, the Andalusian
regional project A-RNM-421-UGR18},
organization = {FPI Grant PRE2020-092556 (funded
by MCIN/AEI/10.13039/501100011033
and the European Social Fund)},
publisher = {Wiley},
title = {Slab Tearing Underneath the Bransfield Strait, Antarctica},
doi = {10.1029/2023GL103813},
author = {Parera Portell, Joan Antoni and Mancilla Pérez, Flor de Lis and Almendros González, Francisco Javier and Stich, Daniel},
}