Presentation: Interactive 2D magnetic inversion: a tool for aiding forward modeling and testing geological hypotheses
Slides for the oral presentation " Interactive 2D magnetic inversion: a tool for aiding forward modeling and testing geological hypotheses" presented at the SEG International Exposition and Seventy-Sixth Annual Meeting in New Orleans, Louisiana, USA. Abstract We present a method for invert...
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ftdatacite:10.6084/m9.figshare.649424 2023-05-15T17:41:42+02:00 Presentation: Interactive 2D magnetic inversion: a tool for aiding forward modeling and testing geological hypotheses Barbosa, Valeria C. F. Silva, João B. C. 2013 https://dx.doi.org/10.6084/m9.figshare.649424 https://figshare.com/articles/presentation/Presentation_Interactive_2D_magnetic_inversion_a_tool_for_aiding_forward_modeling_and_testing_geological_hypotheses/649424 unknown figshare Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY Geophysics FOS Earth and related environmental sciences Presentation MediaObject article Audiovisual 2013 ftdatacite https://doi.org/10.6084/m9.figshare.649424 2021-11-05T12:55:41Z Slides for the oral presentation " Interactive 2D magnetic inversion: a tool for aiding forward modeling and testing geological hypotheses" presented at the SEG International Exposition and Seventy-Sixth Annual Meeting in New Orleans, Louisiana, USA. Abstract We present a method for inverting magnetic data with interfering anomalies produced by multiple complex 2D magnetic sources having arbitrary shapes and known magnetization vectors. Ourmethod is stable and can recover a complex 2D magnetization distribution, leading to a reliable delineation of sectionally homogeneous sources with complex shapes. Our method, although similar to interactive forward modeling, is unique in that it automatically fits the observations and only requires that the interpreter know the outlines of the sources expressed by simple geometric elements such as points and line segments. Each geometric element operates as a skeletal outline of a particular homogeneous section of the magnetic source to be reconstructed. Also, the interpreter can define the geometric elements interactively without worrying about data fitting because data are fit automatically. The examples with synthetic data illustrate the good performance of the method in mapping the complex geometry of magnetic sources. The solution sensitivity to uncertainties in the a priori information shows that to produce good results, the uncertainty on the magnetization intensity of each homogeneous extent of the source should be smaller than 40%.Awrong magnetization vector direction can be detected easily because it often leads to poor data fitting and to estimated sources with abrupt borders. The method is also applied to two sets of real data from the Northwest Ore Body at Iron Mountain Mine, Missouri, and the Hatton-Rockall Basin in the northeast Atlantic Ocean. The estimated magnetization distribution in all tests demonstrates a good correlation of estimated magnetic sources with corresponding known geologic features. Conference Object Northeast Atlantic DataCite Metadata Store (German National Library of Science and Technology) Hatton-Rockall Basin ENVELOPE(-17.000,-17.000,57.500,57.500) Iron Mountain ENVELOPE(-128.653,-128.653,54.183,54.183) Orleans ENVELOPE(-60.667,-60.667,-63.950,-63.950) |
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Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Geophysics FOS Earth and related environmental sciences |
spellingShingle |
Geophysics FOS Earth and related environmental sciences Barbosa, Valeria C. F. Silva, João B. C. Presentation: Interactive 2D magnetic inversion: a tool for aiding forward modeling and testing geological hypotheses |
topic_facet |
Geophysics FOS Earth and related environmental sciences |
description |
Slides for the oral presentation " Interactive 2D magnetic inversion: a tool for aiding forward modeling and testing geological hypotheses" presented at the SEG International Exposition and Seventy-Sixth Annual Meeting in New Orleans, Louisiana, USA. Abstract We present a method for inverting magnetic data with interfering anomalies produced by multiple complex 2D magnetic sources having arbitrary shapes and known magnetization vectors. Ourmethod is stable and can recover a complex 2D magnetization distribution, leading to a reliable delineation of sectionally homogeneous sources with complex shapes. Our method, although similar to interactive forward modeling, is unique in that it automatically fits the observations and only requires that the interpreter know the outlines of the sources expressed by simple geometric elements such as points and line segments. Each geometric element operates as a skeletal outline of a particular homogeneous section of the magnetic source to be reconstructed. Also, the interpreter can define the geometric elements interactively without worrying about data fitting because data are fit automatically. The examples with synthetic data illustrate the good performance of the method in mapping the complex geometry of magnetic sources. The solution sensitivity to uncertainties in the a priori information shows that to produce good results, the uncertainty on the magnetization intensity of each homogeneous extent of the source should be smaller than 40%.Awrong magnetization vector direction can be detected easily because it often leads to poor data fitting and to estimated sources with abrupt borders. The method is also applied to two sets of real data from the Northwest Ore Body at Iron Mountain Mine, Missouri, and the Hatton-Rockall Basin in the northeast Atlantic Ocean. The estimated magnetization distribution in all tests demonstrates a good correlation of estimated magnetic sources with corresponding known geologic features. |
format |
Conference Object |
author |
Barbosa, Valeria C. F. Silva, João B. C. |
author_facet |
Barbosa, Valeria C. F. Silva, João B. C. |
author_sort |
Barbosa, Valeria C. F. |
title |
Presentation: Interactive 2D magnetic inversion: a tool for aiding forward modeling and testing geological hypotheses |
title_short |
Presentation: Interactive 2D magnetic inversion: a tool for aiding forward modeling and testing geological hypotheses |
title_full |
Presentation: Interactive 2D magnetic inversion: a tool for aiding forward modeling and testing geological hypotheses |
title_fullStr |
Presentation: Interactive 2D magnetic inversion: a tool for aiding forward modeling and testing geological hypotheses |
title_full_unstemmed |
Presentation: Interactive 2D magnetic inversion: a tool for aiding forward modeling and testing geological hypotheses |
title_sort |
presentation: interactive 2d magnetic inversion: a tool for aiding forward modeling and testing geological hypotheses |
publisher |
figshare |
publishDate |
2013 |
url |
https://dx.doi.org/10.6084/m9.figshare.649424 https://figshare.com/articles/presentation/Presentation_Interactive_2D_magnetic_inversion_a_tool_for_aiding_forward_modeling_and_testing_geological_hypotheses/649424 |
long_lat |
ENVELOPE(-17.000,-17.000,57.500,57.500) ENVELOPE(-128.653,-128.653,54.183,54.183) ENVELOPE(-60.667,-60.667,-63.950,-63.950) |
geographic |
Hatton-Rockall Basin Iron Mountain Orleans |
geographic_facet |
Hatton-Rockall Basin Iron Mountain Orleans |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.649424 |
_version_ |
1766143407245230080 |