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Двумерная инверсия магнитотеллурических данных с учётом влияния рельефа поверхности

Двумерная инверсия магнитотеллурических данных с учётом влияния рельефа поверхности

Abstract

During the magnetotelluric sounding in areas with uneven surface (mountains, depressions), researchers are faced with a problem of adequate interpretation in these situations. Nowadays there are some available programs of inversion employed to examine the surface with a smooth topography. Quasi-two-dimensional inversion and interpretation which are based on one-dimensional inversion and do not take into account the surface relief, as the simulation shows, can distort the information about the geo-electric section. The article develops the algorithm and program of two-dimensional inversion of the magnetotelluric data considering the profile relief. The inversion is based on the minimal residual method with the adaptive regularization. The solution of a direct two-dimensional problem is carried out by a finite difference method. Detailed presentation of the algorithm can also be used for other tasks. Algorithm was tested on model data. Comparison of the received characteristics of models taking into account a relief and without it showed efficiency of the technique.

При проведении магнитотеллурических зондирований в районах с неровной поверхностью (горы, впадины) исследователь сталкивается с проблемой адекватности интерпретации. Известные и доступные программы инверсии относятся к ровной поверхности. Двумерная инверсия и квазидвумерная интерпретация, основанные на одномерной инверсии и не учитывающие рельефа поверхности, как показывает моделирование, могут сильно исказить информацию о геоэлектрическом разрезе. В предлагаемой статье разработаны алгоритм и программа двумерной инверсии магнитотеллурических данных с учётом рельефа местности. Инверсия основана на методе минимальных невязок с адаптивной регуляризацией. Решение прямой двумерной задачи осуществляется методом конечных разностей. Подробно представленный алгоритм может быть применён и для других задач. Алгоритм был протестирован на модельных данных. Сравнение полученных характеристик моделей с учётом рельефа и без его учёта показало эффективность разработанной методики для получения достоверной информации о геоэлектрическомразрезе.

Keywords

ДВУМЕРНАЯ ИНВЕРСИЯ, МАГНИТОТЕЛЛУРИЧЕСКИЕ ДАННЫЕ, РЕЛЬЕФ, АДАПТИВНАЯ РЕГУЛЯРИЗАЦИЯ, МОДЕЛИРОВАНИЕ

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
gold