Crustal and uppermost mantle structure of Cape Verde from ambient noise tomography

Carvalho, J.; Silveira, G.; Kiselev, S.; Custódio, S.; Ramalho, R. S.; Stutzmann, E.; Schimmel, M.

doi:10.1093/gji/ggac254

Crustal and uppermost mantle structure of Cape Verde from ambient noise tomography

Journal Article · Fri Jul 01 00:00:00 EDT 2022 · Geophysical Journal International

DOI:https://doi.org/10.1093/gji/ggac254· OSTI ID:1879570

; ; Kiselev, S.; Custódio, S.; Ramalho, R. S.; Stutzmann, E.;

SUMMARY

We present a seismic ambient noise tomography of the Cape Verde archipelago, located in the Atlantic Ocean, approximately 600 km west of Senegal. We used 38 seismic broad-band stations that continuously recorded for 10 months, in order to construct the first 3-D model of Sv-wave velocities for the crust and uppermost mantle beneath the Cape Verde region. We started by computing phase cross-correlations for vertical component recordings using all possible inter-island station pairs. Next, a time–frequency phase-weighted stack was applied to obtain robust Rayleigh-wave group-velocity dispersion curves in the period band between 10 and 24 s. Group-velocity maps at different periods are obtained by inverting the dispersion curves. We then inverted the group-velocity maps to obtain the 3-D shear wave velocity structure of the crust and uppermost mantle beneath Cape Verde. The final 3-D model extends from 8 km down to 23 km and has a lateral resolution of about 50 km. The crust in the southwestern sector, encompassing Fogo, presents lower S-wave velocities that may be caused by the presence of melt pockets and/or hydrothermal fluids circulation. The uppermost mantle beneath the northwestern sector is characterized by higher S-wave velocities in agreement with previous results obtained from Ps and Sp receiver functions. Those high-velocity anomalies can reflect non-altered crust or remnants of magma chambers or solidified basaltic intrusions, which fed the volcanism in these islands. Our maps revealed the presence of crustal underplating across the entire archipelago, yet stronger beneath the groups Santo Antão—São Vicente—São Nicolau and Fogo—Santiago—Maio.

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Sponsoring Organization:: USDOE Office of Nuclear Energy (NE), Nuclear Fuel Cycle and Supply Chain

OSTI ID:: 1879570

Journal Information:: Geophysical Journal International, Journal Name: Geophysical Journal International Journal Issue: 2 Vol. 231; ISSN 0956-540X

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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