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Use of low frequencies for sub‐basalt imaging
Author(s) -
Ziolkowski Anton,
Hanssen Peter,
Gatliff Robert,
Jakubowicz Helmut,
Dobson Andrew,
Hampson Gary,
Li XiangYang,
Liu Enru
Publication year - 2003
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1046/j.1365-2478.2003.00363.x
Subject(s) - basalt , geology , reflection (computer programming) , seismology , geophone , igneous petrology , towing , geophysics , tectonics , engineering geology , volcanism , computer science , automotive engineering , engineering , programming language
Many prospective passive ocean margins are covered by large areas of basalts. These basalts are often extremely heterogeneous and scatter the seismic energy of the conventional seismic reflection system so that it becomes difficult to obtain information on deeper reflectors. Since high frequencies are scattered more than low frequencies, we argue that the acquisition system for sub‐basalt targets should be modified to emphasize the low frequencies, using much larger airguns, and towing the source and receivers at about 20 m depth. In the summer of 2001 we obtained seismic reflection data over basalt in the northeast Atlantic using a system modified to enhance the low‐frequency energy. These new data show deep reflections that are not visible on lines shot in the same places with a conventional system.