Joint ambient noise and earthquake tomography of the Central Mediterranean region
| Autor: | Eckel, Felix, El-Sharkawy, Amr, Scarfì, Luciano, Barberi, Graziella, Langer, Horst, Lebedev, Sergei, Meier, Thomas |
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| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Zdroj: | XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
| Popis: | Surface wave tomography is a powerful tool for resolving crustal and upper mantle structures without the need of local sources. In this study, we present a 3D model of the Southern Italy and Central Mediterranean region based on the joint inversion of ambient noise and earthquake data. The input data consists of 11 900 phase velocity dispersion curves between 2 and 100 seconds obtained from ambient noise cross correlations and 81 000 phase velocity curves between 8 and 250 seconds obtained from averaging earthquake measurements using the two-station method. The two quality controlled datasets are merged using a correction factor that is derived from inter-station paths where both types of measurements are available.Azimuthally anisotropic Rayleigh wave phase velocity maps are calculated using a regularized least square approach. The phase velocity maps are inverted for a 3D model by applying a stochastic particle swarm optimization algorithm.The resulting 3D velocity model reveals several important features of the subsurface structure, including the subducted Calabrian and Hellenic slabs as well as a slab tear beneath Sicily. Moreover, the model images for example the transition from the Ionian Lithosphere to the Calabrian Slab, deformation of the Adriatic Lithosphere and aesthenospheric flow beneath the Tyrrhenian Sea. These results provide valuable insights into the evolution of the subduction zones in the Adriatic and Central Mediterranean region. The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) |
| Databáze: | OpenAIRE |
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