caa a22 4500 445814306 CHVBK 20180317145221.0 cr unu---uuuuu 170323e20111101xx s 000 0 eng 10.1007/s10712-011-9143-1 doi (NATIONALLICENCE)springer-10.1007/s10712-011-9143-1 Novotný Miroslav Institute of Geophysics ASCR, Boční II/1401, 141 31, Prague 4, Czech Republic aut Depth-Recursive Tomography of the Bohemian Massif at the CEL09 Transect—Part A: Resolution Estimates and Deblurring Aspects [Elektronische Daten] [Miroslav Novotný] The refraction CEL09 profile from the CELEBRATION 2000 project intersects the main terranes of the Bohemian Massif in the NW-SE direction: the Saxothuringian, the Teplá-Barrandian, the Moldanubian and the Moravo-Silesian. In its easternmost part, it crosses the Western Outer Carpathians overthrust westward onto the Bohemian Massif. Only the first 450km were surveyed with the densest deployment of shot points providing data suitable for a reliable geological interpretation. The first-arrival depth-recursive tomography was applied here to derive a P-wave velocity image of the upper and middle crust (Part A). The proper interpretation of the obtained velocity features is the subject of the accompanying paper (Part B). The attained resolution in the velocity image is shown to be superior as compared with the previous CEL09 models based also on the more uncertain later arrivals of reflection waves. The applied DRTG (depth-recursive tomography on grid) method is based on a regular network of refraction grid rays generated for iteratively updated starting models. Only the distinct first arrivals with minimum uncertainty are used for the DRTG inversions to yield the maximum resolution. Thanks to the full control of the data fit by the grid rays used, the statistical lateral resolution could be determined at single grid depths for the chosen confidence levels. Thus, the lateral sizes of the anomalies that can be yet resolved are determined in dependence on their depths and their velocity excesses. The defocusing of the imaged features is studied on the basis of the spatial responses to spike excitation. The calculated spatial responses also allowed the edge smearing of the velocity anomalies to be assessed. Special attention is paid to the imaging of low-velocity zones that are usually suppressed by the smoothing measures used in standard tomographic methods. An improvement was achieved if the smoothing was suggested with regard to the occurrence of the low-velocity zones repeatedly appearing in higher iterations. The gained deblurring effect concerns both the negative and positive anomalies as documented on the velocity features interpreted in the accompanying paper. Springer Science+Business Media B.V., 2011 Refraction tomography nationallicence Depth-recursive tomography nationallicence Lateral resolution nationallicence Impulse response nationallicence Two-point resolution nationallicence Deblurring of velocity image nationallicence CEL09 refraction profile nationallicence Bohemian Massif nationallicence Surveys in Geophysics Springer Netherlands 32/6(2011-11-01), 827-855 0169-3298 32:6<827 2011 32 10712 https://doi.org/10.1007/s10712-011-9143-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10712-011-9143-1 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Novotný Miroslav Institute of Geophysics ASCR, Boční II/1401, 141 31, Prague 4, Czech Republic aut NATIONALLICENCE 773 0- Surveys in Geophysics Springer Netherlands 32/6(2011-11-01), 827-855 0169-3298 32:6<827 2011 32 10712 Metadata rights reserved Springer special CC-BY-NC licence nationallicence SWISSBIB 445814306 BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer