engleski

MOHOROVICIC’S DISCOVERY AND THE FIRST CENTURY OF STUDIES OF THE CRUST AND UPPER MANTLE IN CROATIA

Seismological studies of the earth’s interior began in Croatia 100 years ago, by the seminal paper in which A. Mohorovičić proved the existence of the crust-mantle boundary. In the subsequent years, Mohorovičić devoted much of his energy to improving travel-time curves of crustal phases. Large-scale seismic profiling carried out in the 1980-ies and interpretation of deep seismic profiles running across the country, yielded the first map of the Moho topography. In the 1990-ies several papers appeared which dealt with determination of velocities and attenuation (coda- Q) in the greater circum-Adriatic region. A more thorough investigation of the coda attenuation is under way. More recently, a large database of Pg-phase arrival times was used to assess the azimuthal anisotropy of the P-wave velocity within the crust in the NW Croatia and in parts of the External Dinarides. An ongoing study of the shear-wave splitting is expected to give additional constraints on the anisotropic properties of the crust and mantle beneath Croatian seismic network. The interpretation of data obtained within a large international seismic experiment (ALP2002) lead to new constraints on the crustal structure in western Croatia. Lithospheric structure beneath coastal and continental Croatia is being studied also by broadband teleseismic waveform modeling using receiver functions. The results indicate that the Mohorovicic discontinuity in Dalmatia may lie considerably deeper than presented on recent maps of the Moho topography in Europe.

Mohorovičić discontinuity; Croatia

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