Premium
Effects of near‐surface waveguides on shallow high‐resolution seismic refraction and reflection data
Author(s) -
Robertsson J. O. A.,
Holliger K.,
Green A. G.,
Pugin A.,
De Iaco R.
Publication year - 1996
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/96gl00384
Subject(s) - classification of discontinuities , reflection (computer programming) , refraction , geology , seismology , optics , seismic refraction , resolution (logic) , high resolution , waveguide , seismic wave , waves and shallow water , physics , remote sensing , mathematical analysis , mathematics , artificial intelligence , computer science , programming language , oceanography
Waveguides formed between the earth's free‐surface and sharp subsurface velocity discontinuities, such as the watertable, may have a significant impact on high‐resolution seismic refraction and reflection data. Energy trapped in such waveguides may propagate over long distances with little loss due to geometrical spreading. The dispersive nature of the guided waves results in pronounced shingling of the first arrivals. This narrows the “optimum reflection window” between the first arrivals and the ground roll, and may lead to mispicking of first breaks and difficulties in identifying and processing shallow reflections.