An Approximate Inversion Procedure for Lines/Grids/Collections of Time‐Domain Electromagnetic Soundings

1998 ◽  
Author(s):  
Colin G. Farquharson ◽  
Douglas W. Oldenburg ◽  
Yaoguo Li
Keyword(s):  
Time Domain ◽  
Electromagnetic Soundings ◽  
Time Domain Electromagnetic ◽  
Inversion Procedure

Simple inversion of time‐domain electromagnetic data

Geophysics ◽  
1984 ◽  
Vol 49 (7) ◽  
pp. 925-933 ◽  
Author(s):  
C. T. Barnett
Keyword(s):  
Time Domain ◽  
Eddy Currents ◽  
Early Time ◽  
Late Time ◽  
Current Filament ◽  
Equivalent Current ◽  
Time Domain Electromagnetic ◽  
Inversion Procedure ◽  
Current Filaments ◽  
Simple Inversion

The eddy currents induced in a thin confined conductor by a fixed‐loop time‐domain EM system can be represented by a single equivalent current filament. The equivalent current filament stays in the plane of the conductor at all times during the decay of the secondary field, but tends to migrate from a position of maximum primary field coupling at early time toward the center of the conductor at late time. This filament approximation is used in the design of a least‐squares inversion procedure which fits circular or rectangular current filaments to an observed eddy current distribution. The inversion procedure provides a rapid but precise means of estimating the position, size, and attitude of a conductor which has been detected by a time‐domain EM survey.

Combined time domain electromagnetic soundings and gravimetry to determine marine intrusion in a detrital coastal aquifer (Southern Spain)

2008 ◽  
Vol 349 (3-4) ◽  
pp. 536-547 ◽  
Author(s):  
Carlos Duque ◽  
María Luisa Calvache ◽  
Antonio Pedrera ◽  
Wenceslao Martín-Rosales ◽  
Manuel López-Chicano
Keyword(s):  
Time Domain ◽  
Coastal Aquifer ◽  
Southern Spain ◽  
Electromagnetic Soundings ◽  
Time Domain Electromagnetic ◽  
Detrital Coastal Aquifer
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