Crustal structure of the Carpathian–Pannonian region from ambient noise tomography
| Autor: | Mircea Radulian, Constantin Ionescu, Oguz Gogus, Bogdan Grecu, Bogdan Zaharia, Dragos Tataru, Felix Borleanu |
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| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Geophysical Journal International. 195:1351-1369 |
| ISSN: | 1365-246X 0956-540X |
| DOI: | 10.1093/gji/ggt316 |
| Popis: | We use ambient noise tomography to investigate the crust and uppermost mantle structure beneath the Carpathian-Pannonian region of Central Europe. Over 7500 Rayleigh wave empirical Green's functions are derived from interstation cross-correlations of vertical component ambient seismic noise recordings (2005-2011) using a temporary network of 54 stations deployed during the South Carpathian Project (2009-2011), 56 temporary stations deployed in the Carpathian Basins Project (2005-2007) and 100 permanent and regional broad-band stations. Rayleigh wave group velocity dispersion curves (4-40 s) are determined using the multiple-filter analysis technique. Group velocity maps are computed on a grid of 0.2° × 0.2° from a non-linear 2-D tomographic inversion using the subspace method. We then inverted the group velocity maps for the 3-D shear wave velocity structure of the crust and uppermost mantle beneath the region. Our shear wave velocity model provides a uniquely complete and relatively high-resolution view of the crustal structure in the Carpathian-Pannonian region, which in general is validated by comparison with previous studies using other methods to probe the crustal structure. At shallow depths ( 30 km are relatively fast, presumably related to shallowing of the Moho consequent on the extensional history of the Pannonian region. |
| Databáze: | OpenAIRE |
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