کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4740002 1641139 2015 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Frequency and time domain three-dimensional inversion of electromagnetic data for a grounded-wire source
ترجمه فارسی عنوان
سه بعدی سه بعدی انتقال داده های الکترومغناطیسی برای یک منبع سیم متناوب
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فیزیک زمین (ژئو فیزیک)
چکیده انگلیسی


• Frequency- and time-domain 3-D inversion approaches are presented.
• The performances of frequency- and time-domain inversions are tested and compared on ground and airborne LOTEM data.
• The resolution capabilities of ground and airborne LOTEM and CSAMT data are compared.

We present frequency- and time-domain three-dimensional (3-D) inversion approaches that can be applied to transient electromagnetic (TEM) data from a grounded-wire source using a PC. In the direct time-domain approach, the forward solution and sensitivity were obtained in the frequency domain using a finite-difference technique, and the frequency response was then Fourier-transformed using a digital filter technique. In the frequency-domain approach, TEM data were Fourier-transformed using a smooth-spectrum inversion method, and the recovered frequency response was then inverted. The synthetic examples show that for the time derivative of magnetic field, frequency-domain inversion of TEM data performs almost as well as time-domain inversion, with a significant reduction in computational time. In our synthetic studies, we also compared the resolution capabilities of the ground and airborne TEM and controlled-source audio-frequency magnetotelluric (CSAMT) data resulting from a common grounded wire. An airborne TEM survey at 200-m elevation achieved a resolution for buried conductors almost comparable to that of the ground TEM method. It is also shown that the inversion of CSAMT data was able to detect a 3-D resistivity structure better than the TEM inversion, suggesting an advantage of electric-field measurements over magnetic-field-only measurements.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Applied Geophysics - Volume 112, January 2015, Pages 106–114
نویسندگان
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