Enhancement in the Target Resolution by Joint Inversion of Seismic, Electrical, and Electromagnetic Data
Saurabh K. Verma
National Geophysical Research Institute, Hyderabad, India, India.
Contacts: skvngri@hotmail.com (Saurabh K. Verma)
Abstract
Seismic, electrical, and electromagnetic methods are commonly employed to solve a variety of geophysical problems. Individual applications of these methods have been effective in investigating geological settings with favorable contrasts in physical properties of various units. However, in difficult situations like detection of a low velocity layer (LVL) below a high velocity layer, or a thin resistive layer below a conducting layer, applications of individual methods do not yield very good resolution of the target layer. While in seismic methods, detection of a sandwiched LVL is a well known problem, detection of a resistive layer below a conducting layer becomes difficult due to screening by the currents induced in the overburden layer. In electrical and electromagnetic methods, the problem is further compounded by the equivalence phenomenon. A numerical technique is developed to jointly consider various data sets in an inversion algorithm with options to consider various data sets individually or in any desired combination. Various data sets that can be considered are
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Last modified: Fri Dec 06 15:07:05 2002