New approaches in higt-resolution shallow seismic prospection

• Main Author: Valenta, Jan
• Other Authors: Dohnal, Jiří
• Format: Doctoral Thesis
• Language: English
• Published: 2007
• Online Access: http://www.nusl.cz/ntk/nusl-372694

This work deals with the application of seismic methods in high-resolution near-surface prospection. Two topics are covered in this text. The first one describes processing and application of 3D shallow seismic refraction, while the second one deals with possible methods of identification and filtration of S-waves. The processing of the 3D seismic refraction data is currently carried out mainly by means of the seismic tomography. Because the tomography method usually works with the gradient model of the subsurface, an approach to the layer-based model was sought. The solution was found in a modification of the time-term method. The time- term method was modified to handle also the lateral variations of velocity in highly heterogeneous media. REFRACT3D computer program for data processing using the time-term method was developed. The modified time-term method was successfully tested during the archaeological prospection of the Děvin Castle and during the pro- spection of the shallow subsurface of the Ostaš seismic station. The results from the time-term method were compared with the results obtained by the first arrival travel time tomography. In the case of the Děvin Castle the time-term results surpass the tomography one, while at the locality of Ostaš the tomography results are better. The imaging...