Crustal thickness in Vrancea area,Romania from S to P converted waves |
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| Authors: | Marian Ivan |
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| Institution: | (1) Department of Geophysics, University of Bucharest, 6 Traian Vuia str., 020956 Bucharest o.p.37, Romania;(2) School of Ocean and Earth Sciences, Tongji University, 1239 Siping Rd., 200092 Shanghai, China |
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| Abstract: | Crustal thickness (CT) in Vrancea region (Romania) and adjacent area is investigated using 1294 S to P converted waves from
the Moho discontinuity. A total of 269 local earthquakes in the depth range 99.8 to 171.1 km and recorded by 76 permanent
and 46 temporary stations of the Romanian Seismological Network are used. Time difference between the converted wave and the
direct P phase is corrected to a first order for epicentral distance and for the errors in focal depth, being finally inverted
to CT. Greatest values for the Moho depth are observed for stations located in the Carpathians molasse foredeep and smaller
values are observed in the Southern part of the Moesian Platform, for stations in the eastern part of Moldavian (East-European)
Platform and in Dobrogea area, close to the Black Sea shoreline. In Vrancea epicentral area, an important CT variation is
observed, from 42 km at MLR and 41.8 km at SIR, stations placed in the south-western part of the epicentral area, to 30.9 km
at VRI, located above north-eastern part of the seismogenic volume. Stations CVO and OZU, placed in Transylvanian Basin in
the proximity of the epicentral area, have CT values of 32.1 and 24.1 km, respectively. The results seem to support that a
mantle delamination process is responsible for Vrancea intermediate depth seismicity. |
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