Preprints
https://doi.org/10.5194/egusphere-2022-230
https://doi.org/10.5194/egusphere-2022-230
 
11 May 2022
11 May 2022

Upper lithospheric structure of northeastern Venezuela from joint inversion of surface wave dispersion and receiver functions

Roberto Cabieces1, Antonio Villaseñor2, Elizabeth Berg3, Andrés Olivar-Castaño4, Mariano Arnaiz-Rodríguez5,8, Sergi Ventosa2,6, and Ana M. G. Ferreira7 Roberto Cabieces et al.
  • 1Geophysical Department, Spanish Navy Observatory, San Fernando, 11408, Spain
  • 2Institute of Marine Sciences, Pg. Marítim de la Barceloneta, 37-49, E-08003 Barcelona, Spain
  • 3Sandia National Laboratories, Albuquerque, New Mexico 87185, United States of America
  • 4Institute of Geosciences, Potsdam University, Karl-Liebknecht-Str. 24-25. Potsdam, Germany
  • 5Departamento de Geofísica, Facultad de Ingeniería, Universidad Central de Venezuela
  • 6Geosciences Barcelona, Geo3Bcn CSIC, c/ Solé Sabarís sn, Barcelona, Spain
  • 7Department of Earth Science, University College London, Gower place, WC1H 6BT London, UK
  • 8Department of Physics of the Earth and Astrophysics, Universidad Complutense de Madrid (UCM). Madrid 28040, Spain

Abstract. We use 1.5 years of continuous recordings from an amphibious seismic network deployment in the region of northeast South America and southeast Caribbean to study the crustal and uppermost mantle structure through a joint inversion of surface wave dispersion curves determined from ambient seismic noise and receiver functions. The availability of both ocean bottom seismometers (OBSs) and land stations makes this experiment ideal to determine the best processing methods to extract reliable empirical Green’s functions (EGFs) and construct a 3D shear velocity model. Results show EGFs with high signal-to-noise ratio for land-land, land-OBS and OBS-OBS paths from a variety of stacking methods. Using the EGF estimates, we measure phase and group velocity dispersion curves for Rayleigh and Love waves. We complement these observations with receiver functions, which allow us to perform an H-k analysis to obtain Moho depth estimates across the study area. The measured dispersion curves and receiver functions are used in a Bayesian joint inversion to retrieve a series of 1D shear-wave velocity models, which are then interpolated to build a 3D model of the region. Our results display clear contrasts in the oceanic region across the border of the strike-slip fault system San Sebastian - El Pilar as well as a high velocity region that corresponds well with the continental craton of southeastern Venezuela. We resolve known geological features in our new model, including the Espino Graben and the Guiana Shield provinces, and provide new information about their crustal structures. Furthermore, we image the difference in the crust beneath the Maturin and Guárico Sub-Basin.

Roberto Cabieces et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-230', Anonymous Referee #1, 20 Jun 2022
  • RC2: 'Comment on egusphere-2022-230', Franck Audemard, 10 Aug 2022

Roberto Cabieces et al.

Roberto Cabieces et al.

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Short summary
The manuscript presents a new 3D shear wave velocity model of the lithosphere of northeastern Venezuela, including new Moho and Vp/Vs maps. Data were retrieved from land and broadband ocean bottom seismometers from the BOLIVAR experiment.