2015 Fiscal Year Final Research Report
Development of an advanced inversion code for obtaining 3-D electrical conductivity structures by combining Wideband and Network MT data
| Project/Area Number |
25400443
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Solid earth and planetary physics
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Keywords | 電気伝導度構造 / ３次元 / インヴァージョン / コード開発 / 表層不均質の影響除去 / 位相テンソル / 磁場変換関数 / ネットワークMT |
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| Outline of Final Research Achievements |
Electrical conductivity is one of the most important geophysical properties and especially sensitive to existence of subsurface water or melts. Non-uniqueness in scales of conductivity values and structural lengths, however, has long been debated in the previous studies to estimate the conductivity structure. For the purpose of reproducing structures with the true scales from the observation parameters, we tried to develop 3-D inversion schemes where only the observation parameters free from distortions due to existence of near-surface small-scale resistivity heterogeneity are used. We succeeded in coding a 3-D inversion by using only the phase tensor and the induction vectors which can be obtained from the wide-band MT survey. We applied the code to the real data obtained in the Iwaki area with significant earthquake swarm activities induced by the 2011 great Tohoku earthquake. By examining the results, we confirmed that the true scales were reproduced in the real data application.
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| Free Research Field |
地球電磁気学
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