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PROJECT ETAL PROXYCAP UPDATE
and Pasyanos, M., Update on CRUST1.0 – A 1-degree Global Model of Earth’s Crust, Geophys. “Constraints on seismic velocities in the earth from travel times” Geophys. Aster (2012), Data Products at the IRIS DMC: Stepping Stones for Research and Other Applications, Seismological Research Letters, 83(5), 846–854. Upper mantle Earth structure in Africa from full-wave ambient noise tomography. To cite the original work behind this Earth model: Dashed black lines correspond to the boundaries of cratons and metacratons and thin, In a and b, blue contour lines indicate where shear velocities are equal In a-d), gray contour lines indicate where shear velocities are 1.7% fast inĬomparison to the global average. Triangles show seismic stations for which high- SNR EGFs contributed to the model. The model is masked by gray where it is not expected to have sensitivity to structure. The color bar is set to ☑2% of AK135 global average Earth model (Kennett et al., 1995)Īt each depth. Isotropic Vs depth slices are shown as absolute velocity (m/s) at a) 105 km, b) 165 km, c) 235 km,Īnd d) 424 km. The best resolution exists at upper mantle depths (~100-400 km) between 25°S to 45°N and 0 to 50° E.
Inversion block size increases with model depth in the vertical direction, from 11-34 km spacing.
Model inversion blocks are 1°x1° in the horizontal direction. Data with SNR > 5 at periods of 40-340 sec periods (from 186 seismic stations) were used to invert for this upper-mantle model. EGFs with Rayleigh wave signal-to-noise ratio (SNR) > 5 were for 414 stations at periods of 7-340 sec. Included in the netCDF are depths from 33-614 km best model resolution is at ~100-400 km.Īfrica and parts of the Arabian Peninsula and Mediterranean (latitude: -41.4° to 51.6°, longitude: -32.6° to 66.4°).Īmbient noise data were collected from 851 seismic stations located throughout Africa, the Middle East, and Southern Europe, and station-station cross-correlation was used to retrieve empirical Green’s functions (EGFs). Starting model was CRUST1.0 (Laske et al., 2013) underlain by AK135 (Kennett et al., 1995) the final model is provided as absolute shear-wave velocity (km/s).Ī-etal.2018_kmps.nc (see metadata ), is the netCDF file for the model Best model resolution is at depths of ~100-400 km. Model is iteratively updated, and the contributed model provides results following the 9th iteration. Data are inverted using finite-difference full-waveform simulations to construct finite-frequency sensitivity kernels. Model is constrained by long period (40-340 sec.) Rayleigh waves from empirical Green’s functions ( EGF) extracted from cross-correlation between station pairs. 3-D isotropic shear-wave model for Africa from full-wave ambient noise tomographyĪ-etal.2018 is a 3-D isotropic shear-wave tomographic model of Africa and neighboring regions.
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