역시간 구조보정의 역전파 알고리듬을 이용한 굴절 주시 토모그래피

Title
역시간 구조보정의 역전파 알고리듬을 이용한 굴절 주시 토모그래피
Alternative Title
Refraction tomography using backpropagation technique of reverse time migration
Author(s)
민동주; 신창수
Publication Year
2004-10-13
Abstract
We developed a new refraction tomography algorithm based on the backpropagation technique of reverse time migration. In our algorithm, the objective function is built into the residuals between the respective phases of first arrivals in the field data and in the forward modeled data. The phases of first arrivals in model responses can be obtained by taking the natural logarithm of strongly damped monochromatic wavefields, whereas those of field data are generated by multiplying first arrival traveltimes picked in field data by the same angular frequency that is used for the computing phases of model responses. In order to avoid the explicit computation of Frechet derivatives, we exploit the symmetry of Green's wave equation function, and implicitly calculate the steepest descent with the reverse time migration technique.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/31736
Bibliographic Citation
SEG International Exposition and 74th Annual Meeting, pp.1 - 4, 2004
Publisher
The Society of Exploration Geophysicists
Type
Conference
Language
English
Publisher
The Society of Exploration Geophysicists
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