Surveys in Geophysics

, 32:827 | Cite as

Depth-Recursive Tomography of the Bohemian Massif at the CEL09 Transect—Part A: Resolution Estimates and Deblurring Aspects



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 450 km 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.


Refraction tomography Depth-recursive tomography Lateral resolution Impulse response Two-point resolution Deblurring of velocity image CEL09 refraction profile Bohemian Massif 



This study was supported by Project LA08036 of the Program INGO of the Ministry of Education of the Czech Republic. The CELEBRATION 2000 data on Czech territory were acquired thanks to the Research Project No. 630/3/00 granted by the Ministry of the Environment of the Czech Republic and wide international cooperation, mainly with the Polish State Committee for Scientific Research, Ministry of the Environment and the Association for Deep Geological Investigations in Poland. Most of the instrumentation for the CELEBRATION 2000 seismic experiment was provided through grants to the University of Texas at El Paso, USA. The author is grateful to all reviewers whose careful reviews contributed to improvement of this paper.


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© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  1. 1.Institute of Geophysics ASCRPrague 4Czech Republic

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