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Multiobjective particle swarm inversion algorithm for two-dimensional magnetic data

Applied Geophysics 2015年第2期12卷 127-136,273页

作者：熊杰张涛长江大学电子信息学院湖北荆州434023 长江大学石油工业建模与计算技术研究所湖北荆州434023

Regularization inversion uses constraints and a regularization factor to solve ill- posed inversion problems in geophysics. The choice of the regularization factor and of the initial model is critical in regularization inversion. To deal with these problems, we propose a multiobjective particle swarm inversion （MOPSOI） algorithm to simultaneously minimize the data misfit and model constraints, and obtain a multiobjective inversion solution set without the gradient information of the objective function and the regularization factor. We then choose the optimum solution from the solution set based on the trade-off between data misfit and constraints that substitute for the regularization factor. The inversion of synthetic two-dimensional magnetic data suggests that the MOPSOI algorithm can obtain as many feasible solutions as possible; thus, deeper insights of the inversion process can be gained and more reasonable solutions can be obtained by balancing the data misfit and constraints. The proposed MOPSOI algorithm can deal with the problems of choosing the right regularization factor and the initial model.

关键词： multiobjective inversion particle swarm optimization regularization factor global search magnetic data

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Identification of groundwater potential in hard rock aquifer systems using Remote Sensing, GIS and magnetic Survey in Veppanthattai, Perambalur, Tamilnadu

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Journal of Groundwater Science and Engineering 2022年第4期10卷 367-380页

作者： Muthamilselvan A Anamika Sekar Emmanuel Ignatius Department of Remote Sensing Bharathidasan UniversityKhajamalai CampusTiruchirappalliTamil Nadu-620023India

Water is an essential natural resource without which life wouldn’t *** study aims to identify groundwater potential areas in Vepapanthattai taluk of Perambalur district,Tamil Nadu,India,using analytic hierarchy process(AHP)*** sensing and magnetic parameters have been used to determine the evaluation indicators for groundwater occurrence under the ArcGIS *** occurrence is linked to structural porosity and permeability over the predominantly hard rock terrain,making magnetic data more relevant for locating groundwater potential zones in the research ***-SW and NW-SE trending magnetic breaks derived from reduction to pole map are found to be more significant for groundwater *** lineaments rose diagram indicates the general trend of the fracture to be in the NE-SW *** normalised criteria weights acquired using the AHP model was used to reclassify the thematic *** a result,the taluk’s low,moderate,and high potential zones cover 25.08%,25.68%and 49.24%of the study area,*** high potential zones exhibit characteristics favourable for groundwater infiltration and storage,with factors as gentle slope ofmagnetic breaks,magnetic low zones as indicative of dykes and cracks,lithology as colluvial deposits and land surface with dense *** depth of the fracture zones was estimated using power spectrum and Euler Deconvolution *** groundwater potential mapping results were validated using groundwater level data measured from the wells,which indicated that the groundwater potential zoning results are consistent with the data derived from the real world.

关键词： Groundwater exploration Remote Sensing and GIS magnetic data Hard rock terrain Analytical hierarchy process Radially averaged power spectrum

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Geophysical Significance of the Senegalo-Mali Discontinuity: Evidence from Secondary Structures, Kédougou-Kéniéba Inlier, Western Mali

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Open Journal of Geology 2024年第10期14卷 943-962页

作者： Mamadou Yossi Mahamadou Diallo Mamoutou Ouattara Amadou Berthé Saidou Ly Sagax Afrique S.A Geophysical Surveys and Consulting Ouagadougou Burkina Faso Laboratory of Cartography and Mineral Resources Department of Teaching and Research of Geology and Mines National School of Engineering Abderhamane Baba Tour (ENI-ABT) Bamako Mali

The present study focuses on the analysis and description of lineaments interpreted as secondary structures to describe the nature of Senegalo Malian Discontinuity. These lineaments cross-cut the large north-south oriented transcurrent lithospheric structure known as the Senegalo Malian Discontinuity (SMD). Two lineaments were selected oriented NNE (N15˚ to N25˚), one at Dialafara and one at Sadiola. Four profiles on each lineament of these 2 zones, so that there were 2 on each side of the SMD. The ground data collected were processed using proper parameter and software. Some filters were applied to enhance the signal level. These ground data were later compared to the existing airborne magnetic data for consistency and accuracy using the upward continuation filter. The results show that the quality of ground data is good. In addition, the ground magnetic data show the presence of certain local anomalies that are not visible in the regional data. The analytical signal was also used to determine domain boundaries or possible contact zones. The contact zone can be highlighted on certain profiles such as L300 and L600. The study showed that the west and east sides of the SMD are not the same. Secondary structures become wide when approaching the SMD on both sides. They are also duplicated to the east of the SMD when we move progressively away. In the Dialafara area, the ground magnetic data intersect an interpreted fold. The results of this work confirm the presence of the secondary structures and their evolution in relation to the SMD. The relationships between the secondary structures in the Dailafara and Sadiola zones and their relations with the SMD are highlighted. The technique used in this study, is an important approach to better description and interpreting of regional structures using the secondary structures and proposing a structural model.

关键词： Kédougou-Kéniéba Inlier Senegal Malian Discontinuity Secondary Structures Mapping magnetic data

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