A new method for complete quantitative interpretation of gravity data due to dipping faults

Abdelrahman, E. M.; Gobashy, Mohamed; Abo-Ezz, Eid R.; El-Araby, T. M.

doi:10.2478/congeo-2019-0007

Cited by 7 publications

(9 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The mismatch between the estimated anomaly using the suggested method and that using Abdelrahman et al. (2019), may be due to that the second method is highly affected by presence of different nearby structures and/or noise.…”

Section: Application Of Pso Approach To Gazelle Fault Egypt Field Exmentioning

confidence: 93%

“…The gravity anomaly results from a profile taken normal to dipping fault can be expressed by (Abdelrahman et al., 2013; Abdelrahman et al., 2019; Essa, 2013; Telford et al. 1976):

g (x_{i}, z, w, θ) = M (π + \tan^{- 1} (\frac{x_{i} - x_{0}}{z} + \cot θ) - \tan^{- 1} (\frac{x_{i} - x_{0}}{w} + \cot θ)) i = 1, 2, 3, 4, \dots N,

where

x_{i}

is the horizontal location, z is the depth to the center of the upper part of the layer, w is the depth to the center of the lower part of the layer,

x_{0}

is the origin (Figure 1) and M is the amplitude factor (=2GΔ σ h) related to thickness ( h ), G is the gravitational constant, and Δ σ is the density contrast.…”

Section: Methodsmentioning

confidence: 99%

“…A Bouguer gravity profile above the Gazelle fault, located in the South Aswan area (Abdelrahman et al., 2013; Abdelrahman et al., 2019; Essa, 2013). This fault is trending North‐South with 35 km length and situated wholly through late Cretaceous sandstones and shale of the Nubian Formation (Woodward‐Clyde Consultants, 1985) (Figure 5).…”

Section: Application Of Pso Approach To Gazelle Fault Egypt Field Exmentioning

confidence: 99%

“…1966; Lines & Treitel, 1984; Reid et al. 1990; Utyupin & Mishenin, 2012), least squares (Abdelrahman et al., 2013), horizontal derivative (Essa, 2013; Rosid & Siregar, 2017), and characteristic points (Abdelrahman et al., 2019).…”

Section: Introductionmentioning

confidence: 99%

“…Many gravity inversion techniques have been developed to interpret gravity data due to fault structures such as 2D modeling (Tanner 1967), 3D modeling (Cordell and Henderson 1968) these methods require a priori information about density contrast, depth and dip angle from geological and other geophysical data (Essa 2013;Abdelrahman et al 2019), regularization inversion techniques (Tikhonov and Arsenin 1977); graphical and numerical techniques based upon fixed simple geometry (Geldart et al 1966;Lines and Treitel 1984;Abdelrahman et al 1989;Reid et al 1990;Abdelrahman et al 2003a;Utyupin and Mishenin 2012), least squares…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

New Inversion Approach for Interpreting Gravity Data Caused by Dipping Faults

Elhussein

2021

Earth and Space Science

View full text Add to dashboard Cite

A new inversion algorithm of gravity data utilizing the particle swarm optimization (PSO) algorithm is used to interpret dipping faults models. The PSO technique is stochastic in nature; its development was motivated by the common in‐flight performance of birds looking for food. Particles or models represent birds. Individual particles have a location and a velocity vector. The parameter value represents the position vectors. PSO is adjusted by random particles or models and searches for targets by updating generations. This algorithm determines the dipping faults different parameters (amplitude factor, depth to the center of the upper part of the layer, depth to the center of the lower part of the layer, fault dip angle, and the origin of the fault trace). Herein, the PSO algorithm is applied to noise‐free synthetic data, synthetic data contaminated with different random noise levels (5%, 10%, and 15%) and real field gravity data from Egypt. The applicability and efficiency of the PSO inversion algorithm are well demonstrated for synthetic and field gravity data. The errors of the different estimated parameters are calculated for synthetic data, also, the root mean square error is calculated for synthetic and real data. The parameters estimated from real data matches well with that resulted from different published techniques. From the results obtained by using the present technique, we can apply the proposed technique in different applications, like mining and ore exploration.

show abstract

Section: Application Of Pso Approach To Gazelle Fault Egypt Field Exmentioning

confidence: 93%

“…The gravity anomaly results from a profile taken normal to dipping fault can be expressed by (Abdelrahman et al., 2013; Abdelrahman et al., 2019; Essa, 2013; Telford et al. 1976):

g (x_{i}, z, w, θ) = M (π + \tan^{- 1} (\frac{x_{i} - x_{0}}{z} + \cot θ) - \tan^{- 1} (\frac{x_{i} - x_{0}}{w} + \cot θ)) i = 1, 2, 3, 4, \dots N,

where

x_{i}

is the horizontal location, z is the depth to the center of the upper part of the layer, w is the depth to the center of the lower part of the layer,

x_{0}

is the origin (Figure 1) and M is the amplitude factor (=2GΔ σ h) related to thickness ( h ), G is the gravitational constant, and Δ σ is the density contrast.…”

Section: Methodsmentioning

confidence: 99%

Section: Application Of Pso Approach To Gazelle Fault Egypt Field Exmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

New Inversion Approach for Interpreting Gravity Data Caused by Dipping Faults

Elhussein

2021

Earth and Space Science

View full text Add to dashboard Cite

show abstract

Magnetic Signature of Gold Deposits: Example from Um Garayat Region, South Eastern Desert, Egypt

Gobashy

Mekkawi

Araffa

et al. 2023

Pure Appl. Geophys.

View full text Add to dashboard Cite

Magnetic methods of exploration have proved to be efficient and have potential in the gold mineralization industry. New magnetic processing technologies aid in improving the process of interpretation and gold opportunity identification. In this work, we show the possible application of combined digital magnetic filters to explore new gold mineralization localities with application to a well-known Au mineralization zone. Um Garayat (UG) region, southeastern desert, Egypt, is an ancient example of a potential area for gold mining. Modern analysis showed that other types of mineral concentrations are present. So, exploiting the magnetic signature of the area for future investment is of great interest. The old UG gold mine is characterized by volcanic and tectonic features such as faulting and folding that affect the arc sedimentary rock sequence of repeated deformation stages. A thorough geophysical effort has been carried out around the old gold mine in the UG area to explore the extension of mineralized ore deposits. A detailed geophysical survey using magnetics was carried out in this study together with the available aeromagnetic data. Field data sets on appropriate sites were measured, processed, and evaluated by suitable software. High magnetic anomalies were detected based on grid filter analysis and contact occurrence maps as marked as possible ore deposits after satisfying the geologic conditions for gold formation. An integrated understanding of attained results revealed that the new possible ore deposits are related directly to fault and fracture zones in the shape of lenses of variable thickness in this zone. Results show that newly detected mineral occurrences in the UG area are also controlled by major faults and hydrothermal solution enrichment along fault zones at a depth ranging from 20 to 70 m. Favorable fault/joint mineralized places were located. The relationship between the Au-quartz vein's strike direction compared with magnetic anomaly lineament analysis was studied. Search for new sources of Au and other mineral deposits in addition to quartz veins is needed as pockets of accumulated mineral-rich rock fragments are deposited in drainage wadis and fault/joint zones because of hydrothermal solution enrichment.

show abstract

Estimation of Deep-Seated Faults Parameters from Gravity Data Using the Cuckoo Search Algorithm

Özyalın,

Tunçel

2023

Pure Appl. Geophys.

View full text Add to dashboard Cite

A new method for complete quantitative interpretation of gravity data due to dipping faults

Cited by 7 publications

References 20 publications

New Inversion Approach for Interpreting Gravity Data Caused by Dipping Faults

New Inversion Approach for Interpreting Gravity Data Caused by Dipping Faults

Magnetic Signature of Gold Deposits: Example from Um Garayat Region, South Eastern Desert, Egypt

Estimation of Deep-Seated Faults Parameters from Gravity Data Using the Cuckoo Search Algorithm

Contact Info

Product

Resources

About