scholarly journals Interpretation of aeromagnetic data over some parts of Sokoto Basin, Nigeria, using source parameter imaging and 3D Euler deconvolution methods

2020 ◽  
Vol 15 (2) ◽  
pp. 90-98
Author(s):  
Taufiq Suleiman ◽  
F. Nneka Okeke ◽  
N. Daniel Obiora
Keyword(s):  
Source Parameter ◽  
Aeromagnetic Data ◽  
Euler Deconvolution ◽  
3D Euler Deconvolution

scholarly journals Edge Detection and Depth to Magnetic Source Estimation in Part of Central Nigeria

2020 ◽  
pp. 54-67
Author(s):  
Mam D. Tawey ◽  
Abbass A. Adetona ◽  
Usman D. Alhassan ◽  
Abdulwaheed A. Rafiu ◽  
Kazeem A. Salako ◽  
...  
Keyword(s):  
Edge Detection ◽  
Trend Analysis ◽  
Source Parameter ◽  
Fault System ◽  
Euler Deconvolution ◽  
Structural Index ◽  
The South ◽  
Source Estimation ◽  
Magnetic Source ◽  
3D Euler Deconvolution

High-resolution aeromagnetic data covering an area of 24, 200 km2 in north central Nigeria has been acquired and analyzed with the aim of carrying out trend analysis, edge detection (structural delineation) and depth to magnetic source estimation using reduce to the pole (RTP), horizontal gradient magnitude (HGM), center for exploration targeting plug-in (CET), 3D Euler deconvolution and source parameter imaging (SPI) techniques. Trend analysis was applied to the RTP data to delineate structures that have dissected the area. The 3D Euler deconvolution and HGM were correlated by plotting the estimated Euler solutions for a structural index of one (SI=1) on HGM map and the resulting map produced have shown that both methods can contribute in the interpretation of the general structural framework of the study area. The structural delineation based on HGM and CET maps showed that two predominant trends (ENE-WSW) and (WNW-ENE) have affected the area. The trend/depth/contacts of these faults were classified into four groups: Faults <150 m, 150 m - 300 m, 300m - 450 m which are the most predominant fault system based on Euler solutions with a structural index of one (SI=1) and those deeper than 450 m while the result of source parameter imaging (SPI) revealed a depth to source varying from 58 m specifically for areas with shallow depth to the magnetic source to those from deeper source occurring at 588.153m depth especially the south-central portion and the south-eastern portion of the study area.

scholarly journals Combination of Tilt-Angle and Euler Deconvolution Approaches to Determine Structural Features from Aeromagnetic Data Modeling over Akonolinga-Loum Area (Centre-East, Cameroon)

2017 ◽  
Vol 08 (07) ◽  
pp. 925-947 ◽  
Author(s):  
Justine Yandjimain ◽  
Théophile Ndougsa-Mbarga ◽  
Arsène Meying ◽  
Marcelin Bikoro Bi-Alou ◽  
Paul Claude Ngoumou ◽  
...  
Keyword(s):  
Tilt Angle ◽  
Data Modeling ◽  
Structural Features ◽  
Aeromagnetic Data ◽  
Euler Deconvolution

scholarly journals Multi-scale analysis and Modeling of aeromagnetic data over the Bétaré-Oya area in the Eastern Cameroon, for structural evidences investigations

2020 ◽  
Author(s):  
Christian Emile Nyaban ◽  
Théophile Ndougsa-Mbarga ◽  
Marcelin Bikoro-Bi-Alou ◽  
Stella Amina Manekeng Tadjouteu ◽  
Stephane Patrick Assembe
Keyword(s):  
Central African Republic ◽  
Structural Model ◽  
Scale Analysis ◽  
Aeromagnetic Data ◽  
Euler Deconvolution ◽  
Multi Scale ◽  
Tilt Derivative ◽  
Local Tectonics ◽  
Multi Scale Analysis ◽  
Eastern Cameroon

Abstract. This study was carried out in the Lom series in Cameroun, at the border with Central African Republic located between the latitudes 5°30′–6° N and the longitudes 13°30′–14°45′ E. A multi-scale analysis of aeromagnetic data combining tilt derivative, Euler deconvolution, upward continuation and the 2.75D modelling was used. The following conclusion were drawn: 1 – Several major families of faults were mapped. Their orientations are ENE-WSW, E-W, NW-SE, N-S with a NE-SW prevalence. The latter are predominantly sub-vertical with NW and SW dips and appear to be prospective for the future mining investigation. 2 – The evidence of compression, folding and shearing axis, was concluded from superposition of null contours of the tilt-derivative and Euler deconvolution. The evidence of the local tectonics principally due to several deformation episodes (D1, D2 and D4) associated with NE-SW, E-W, and NW-SE events respectively. 3 – Depths of interpreted faults ranges from 1000 to 3400 m. 4 – Several linear structures correlating with known mylonitic veins were identified. These are associated with the Lom faults and represent the contacts between the Lom series and the granito-gneissic rocks; we concluded the intense foldings caused by senestral and dextral NE-SW and NW-SE stumps; 5 – We propose a structural model of the top of the crust (schists, gneisses, granites) that delineates principal intrusions (porphyroid granite, garnet gneiss, syenites, micaschists, Graphite and Garnet gneiss) responsible for the observed anomalies. The 2.75D modelling revealed; many faults with a depth greater than 1200 m and confirmed the observations from RTE-TMI, Tilt derivative and Euler deconvolution; 6 – We developed lithologic profile of Betare Oya basin.

3D Euler deconvolution: Theoretical basis for automatically selecting good solutions

Geophysics ◽  
2003 ◽  
Vol 68 (6) ◽  
pp. 1962-1968 ◽  
Author(s):  
João B. C. Silva ◽  
Valéria C. F. Barbosa
Keyword(s):  
Magnetic Anomaly ◽  
Theoretical Basis ◽  
Source Location ◽  
The Other ◽  
Euler Deconvolution ◽  
Data Window ◽  
Other Hand ◽  
3D Euler Deconvolution ◽  
Structural Indices ◽  
Derivatives Of

We derive the analytical estimators for the horizontal and vertical source positions in 3D Euler deconvolution as a function of the x‐, y‐, and z‐derivatives of the magnetic anomaly within a data window. From these expressions we show that, in the case of noise‐corrupted data, the x‐, y‐, and z‐coordinate estimates computed at the anomaly borders are biased toward the respective horizontal coordinate of the data window center regardless of the true or presumed structural indices and regardless of the magnetization inclination and declination. On the other hand, in the central part of the anomaly, the x‐ and y‐coordinate estimates are very close to the respective source horizontal coordinates regardless of the true or presumed structural indices and regardless of the magnetization inclination and declination. This contrasting behavior of the horizontal coordinate estimates may be used to automatically delineate the region associated with the best solutions. Applying the Euler deconvolution operator inside this region would decrease the dispersion of all position estimates, improving source location precision.

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