%0 Journal Article %1 belfer_etal:1998 %A Belfer, I. %A Bruner, I. %A Keydar, S. %A Kravtsov, A. %A Landa, E. %D 1998 %J Journal of Applied Geophysics %K geophysics seismics %N 3 %P 155--168 %R 10.1016/S0926-9851(97)00025-6 %T Detection of shallow objects using refracted and diffracted seismic waves %U http://dx.doi.org/10.1016/S0926-9851(97)00025-6 %V 38 %X The detection of targets such as tunnels, karst, mines and other local heterogeneities is an important but difficult task in subsurface studies. In this paper a new methodology for determining a near-surface velocity-depth model is described. Common shot gathers and first breaks of refracted seismic waves are used as input data. Low-frequency components of the model are constructed by the intercept time method and coherency inversion. Detection of high-frequency velocity variations is carried out by refraction tomography using the low-frequency model as background. Diffracted waves contain valuable information regarding both the structure and composition of seismic media, especially in cases where target size is comparable to seismic wavelength. A diffraction stack serves as an additional tool for delineation of local scattering objects. The methodology was applied to define tunnel position and to search for the karst formations.

@article{belfer_etal:1998, abstract = {The detection of targets such as tunnels, karst, mines and other local heterogeneities is an important but difficult task in subsurface studies. In this paper a new methodology for determining a near-surface velocity-depth model is described. Common shot gathers and first breaks of refracted seismic waves are used as input data. Low-frequency components of the model are constructed by the intercept time method and coherency inversion. Detection of high-frequency velocity variations is carried out by refraction tomography using the low-frequency model as background. Diffracted waves contain valuable information regarding both the structure and composition of seismic media, especially in cases where target size is comparable to seismic wavelength. A diffraction stack serves as an additional tool for delineation of local scattering objects. The methodology was applied to define tunnel position and to search for the karst formations.}, added-at = {2012-09-01T13:08:21.000+0200}, author = {Belfer, I. and Bruner, I. and Keydar, S. and Kravtsov, A. and Landa, E.}, biburl = {https://www.bibsonomy.org/bibtex/215ef141027861e531e15b8181da13663/nilsma}, doi = {10.1016/S0926-9851(97)00025-6}, interhash = {2ee7e82fab41d10425dda16cb0e0e1f0}, intrahash = {15ef141027861e531e15b8181da13663}, issn = {09269851}, journal = {Journal of Applied Geophysics}, keywords = {geophysics seismics}, month = jan, number = 3, pages = {155--168}, timestamp = {2021-02-09T13:27:34.000+0100}, title = {Detection of shallow objects using refracted and diffracted seismic waves}, url = {http://dx.doi.org/10.1016/S0926-9851(97)00025-6}, volume = 38, year = 1998 }