Crustal scale radial anisotropic structure of northwestern India using ambient noise tomography
| Autor: | Gundu, Santhoshkumar, Maurya, Satish, Gollapally, Mohan |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Zdroj: | XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
| Popis: | We use ambient noise tomography to image the crustal-scale anisotropic structure beneath the Marwar craton of northwestern India to understand the impact of magmatism, crustal growth, and melt distribution. The study region was shaped by several magmatic events that include the Neoproterozoic Erinpura and Malani volcanism, Cretaceous Barmer-Sanchor rifting, and pre-Deccan volcanism. Correlograms of ~300 paths from 29 broadband seismic stations were computed for the vertical and transverse components. Rayleigh and Love wave group velocity dispersion curves of the fundamental mode were computed for the period ranging from 4s to 40s using the frequency-time analysis method. The 3D shear velocity tomography model was constructed by regionalizing the dispersion data to obtain local dispersion curves which were then inverted using a non-linear trans-dimensional Bayesian approach. The geometry of the Barmer-Sanchor rift is clearly delineated by an elliptical zone of low group velocity anomalies. The tomograms reveal low shear velocities ( The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|