반복적인 tensor stripping을 이용한 해양효과 보정

Title
반복적인 tensor stripping을 이용한 해양효과 보정
Alternative Title
Application of an iterative tensor stripping to the sea effect correction
Author(s)
양준모; 이희순; 유해수
Publication Year
2008-09-26
Abstract
When magnetotelluric (MT) data is obtained in vicinity of the coast, the sea can distort observed MT responses of subsurface, especially deep part of subsurface. We introduce an iterative method to correct the sea effect, based on the previous topographic correction method which removes the distortions due to topographic changes in seafloor MT data. The method first corrects the sea effect in observed MT impedance, and then inverts corrected responses in a model space without the sea. Due to mutual coupling between sea and subsurface structure, the correction and inversion steps are iterated until changes in each result become negligible. The method is tested for 1-D and 2-D structure using synthetic MT data produced by 3-D forward modeling including surrounding seas. In all case, the method closely recovers the true structure assumed in generating synthetic responses after a few iterations. To test the applicability of the proposed method to field data, we have generated pseudo-synthetic MT data for the Jeju Island whose 1-D conductivity structure is well known, using 3-D forward modeling. The distortions due to the surrounding sea start to appear below about 1Hz, and this result strongly suggests that the sea effect should be corrected in order to obtain more accurate and reliable interpretation on the subsurface.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/29806
Bibliographic Citation
추계한국지구과학회, pp.1, 2008
Publisher
한국지구과학회
Type
Conference
Language
English
Publisher
한국지구과학회
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