INTERPRETATION IN-STATU-NASCENDI OF SEISMIC WIDE-ANGLE REFLECTIONS BASED ON EUGENO-S DATA

In a new interpretation approach seismic wide-angle data are analysed in statu nascendi, i.e. in the state; where the interpretational chara cteristics of the signals are 'born'. The approach is complementary to other interpretation methods such as kinematic interpretation of velo city models. Seismogram sections are qualitatively compared and classi fied in order to perform the analysis as close as possible to the seis mic wavefield. Correlation of seismic phases and selection of represen tative reflection characteristics of the phases are required for the a nalysis. The approach has been tested on the methodologically homogene ous EUGENO-S data set from the Danish and surrounding areas together w ith other data. The classifications of intra-crustal and PMP reflectio ns show clear regionalizations which correlate with the main geologica l, tectonic and orogenic units. The reflection characteristics of the thin crust below the deep basins in Denmark (the Tornquist Fan) are di fferent from the thick crust of the Baltic Shield and the Ringkobing-F yn High: the character of Moho reflections is 'ringing' in the basin a rea as opposed to 'sharp' in the latter areas, and intra-crustal refle ctions are stronger and more consistent in the basin area than in the latter areas. (C) 1998 Elsevier Science B.V. All rights reserved.