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• W3116078842 abstract "SUMMARY The seismic response of the Santiago City, the capital of Chile with more than 5.5 million inhabitants, is controlled by the properties of the shallower quaternary deposits and the impedance contrast with the underlying Abanico Formation, among other factors. In this study, we process continuous records of ambient seismic noise to perform an ambient seismic noise tomography with the aim of defining the shallower structure of the Abanico Formation underneath the densely populated metropolitan area of Santiago, Chile. The seismic signals were recorded by a network consisting of 29 broad-band seismological stations and 12 accelerograph stations, located in a 35 × 35 km2 quadrant. We used the average coherency of the vertical components to calculate dispersion curves from 0.1 to 5 Hz and Bootstrap resampling to estimate the variance of the traveltimes. The reliable frequency band of the dispersion curves was defined by an empirical method based on sign normalization of the coherency real part. The ambient noise tomography was solved on a domain discretized into 256 2 × 2 km2 cells. Using a regularized weighted least-squares inversion, we inverted the observed traveltimes between stations, assuming straight ray paths, in order to obtain 2-D phase velocity maps from 0.2 to 1.1 Hz, linearly spaced every 0.05 Hz, in 157 of the 256 square cells of the domain. In each square cell with information, dispersion curves were assembled and used to invert shear wave velocity profiles, which were interpolated using the ordinary Kriging method to obtain a 3-D shear wave velocity model valid from 0.6 to 5 km depth. The 3-D velocity model shows that the Abanico Formation is stiffer in the south of the study area with larger velocity anomalies towards the shallower part of the model. The value of the shear wave velocity narrows with depth, reaching an average value of 3.5 km s–1 from 3 to 5 km depth." @default.
• W3116078842 created "2021-01-05" @default.
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• W3116078842 date "2020-12-17" @default.
• W3116078842 modified "2023-10-17" @default.
• W3116078842 title "Shear wave velocity model of the Abanico Formation underlying the Santiago City metropolitan area, Chile, using ambient seismic noise tomography" @default.
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• W3116078842 doi "https://doi.org/10.1093/gji/ggaa600" @default.
• W3116078842 hasPublicationYear "2020" @default.
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