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• W2972531384 abstract "We derive group velocity maps for crustal Rayleigh waves across Costa Rica and corresponding 3-D shear-wave velocity structure from ambient noise cross-correlations between 56 seismic broadband stations. The daily inter-station cross-correlations for the period 2010–2015 of 56 seismic broadband stations are stacked and analysed to warrant a robust extraction of empirical Green’s functions which then are used to measure fundamental mode Rayleigh wave group velocities. Rayleigh wave dispersion curves show consistent patterns within the different geological domains in Costa Rica. Dispersion curves were evaluated in the microseism band from 5- to 17-s period and inverted for group velocity maps using iterative nonlinear travel time tomography. The group velocities at each grid point were inverted for 1-D profiles using a non-linear simulated annealing approach, and transformed into the 3-D velocity structure. The final tomographic model shows clearly the main velocity anomalies associated with tectonic and volcanic activity in Costa Rica. Three localized negative velocity anomalies are seen at all periods (5–17 s) consistent with deep-routed crustal-scale magmatic systems located beneath the Rincón de la Vieja-Miravalles, Arenal-Poás and Turrialba-Irazú volcanic systems, that showed activity over the last 100 years. High velocities can be found beneath the Talamanca arc in southeastern Costa Rica, where active volcanism stopped in the late Miocene. Significant along-strike variations in the morphology of the subducting Cocos plate are imaged consistently by velocity variations in the forearc." @default.
• W2972531384 created "2019-09-19" @default.
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• W2972531384 date "2019-09-09" @default.
• W2972531384 modified "2023-10-06" @default.
• W2972531384 title "Crustal Velocity Anomalies in Costa Rica from Ambient Noise Tomography" @default.
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• W2972531384 doi "https://doi.org/10.1007/s00024-019-02315-z" @default.
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