Comparison of different approaches of computing the tilt angle of the total horizontal gradient and tilt angle of the analytic signal amplitude for detecting source edges

Pham, Luan Thanh; Öksüm, Erdinç; Duc, Thanh; Vu, Minh N.

doi:10.19111/bulletinofmre.746858

Cited by 11 publications

(4 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…There is a need to integrate analytical methods for quantitative analysis. Other approaches may include full tensor gravity anomaly processing for subsurface structural features (Kebede & Mammo, 2021), and edge detection techniques for outlining gravity anomaly source boundaries (Oruc, 2010;Pham et al, 2020;Siombone et al, 2021;Siombone et al, 2022). and southeastern areas of the map.…”

Section: Complete Bouguer Anomaly Mapsmentioning

confidence: 99%

Exploring Heat Sources Using Gravimetric Data: A Case Study of Magadi Geothermal Prospect, Kenya

Odero,

Githiri,

K’Orowe

2024

GEP

View full text Add to dashboard Cite

Understanding the location of the subsurface heat sources is crucial for efficient geothermal resource exploration and exploitation. This study aimed to investigate the faults and the depth to heat sources for a geothermal system in Magadi, southern Rift Valley, through the integration of gravity mapping, 3D Euler deconvolution, and spectral analysis. Gravity mapping is a powerful geophysical method widely used to infer subsurface density variations, which are indicative of geological structures and volcanic intrusions that can be potential heat sources. The Volcano-Tectonic and Fluvial-Deltaic Sedimentation process of the Kenyan rift which encompasses the Magadi basin are responsible for geomorphic and geologic processes in the area. Alkali lava sheets of Magadi plateau trachytes covered with lacustrine sediments characterize 80% of the area. Deeper is the Tanzanian craton basement, overlain by Pliocene to Miocene volcanic and sedimentary rocks. A gravity survey with a data density of 2.375 stations/km 2 produced high-resolution anomaly and total horizontal derivative maps showing gravity highs between −180 mGals to −174 mGals along the eastern zone of the study area. A buried major fault trending N-S was delineated in the mid-upper region of the area by Euler solutions at an average depth of 350 meters. Deeper features associated with possible volcanic dykes and sills gave Euler depth ranges of 0.7 km to 2.2 km. Radial average spectral analysis showed depth to the top of shallow and deep features at 2.4694 km and 5.827 km respectively. The correlation between gravity anomalies, geological structures, and present hot springs supports the hypothesis that volcanic processes have played a significant role in the development of the geothermal system in the study area.

show abstract

Section: Complete Bouguer Anomaly Mapsmentioning

confidence: 99%

Exploring Heat Sources Using Gravimetric Data: A Case Study of Magadi Geothermal Prospect, Kenya

Odero,

Githiri,

K’Orowe

2024

GEP

View full text Add to dashboard Cite

show abstract

“…Địa chỉ email: luanpt@hus.edu.vn https://doi.org/10.25073/2588-1140/vnunst.5140 này được xây dựng dựa trên các đạo hàm ngang hoặc đạo hàm thẳng đứng của dị thường trường thế hoặc dựa trên sự kết hợp giữa các đạo hàm đó [5][6][7][8][9]. Thông thường, các phương pháp xác định biên được chia thành hai nhóm chính, gồm: nhóm phương pháp dựa trên biên độ đạo hàm và nhóm phương pháp dựa trên pha.…”

Section: Mở đầUunclassified

Estimating Effectiveness of Some Methods for Detecting Edge of Potential Field Sources

Luan¹,

Sang²,

Minh³

et al. 2020

NST

View full text Add to dashboard Cite

This paper presents a comparative study of effectiveness of edge detection methods such as total horizontal gradient, analytic signal amplitude, tilt angle, gradient amplitude of tilt angle, theta map, horizontal tilt angle, tilt angle of total horizontal gradient, tilt angle of analytic signal, improved theta map, and total horizontal gradient of improved tilt angle. The effectiveness of each method was estimated on synthetic magnetic data and synthetic gravity anomaly data with and without noise. The obtained results show that the tilt angle of gradient amplitude can detect all the edges more clearly and precisely. The applicability of each method is demonstrated on the aeromagnetic anomaly data from the Zhurihe region of Northeast China, and Bouguer gravity anomaly data from a region of North Vietnam. The results computed by the tilt angle of horizontal gradient were also in accord with the geologic structures of the areas.

show abstract

“…Edge detecting techniques can outline the lateral location of the density sources [20]. There are many methods for enhancing the lateral location of the structures, most of which are based on the horizontal and vertical gradients of the gravity anomaly [24][25][26][27][28][29][30]. Recently, applications of enhancement techniques to potential field data have shown great success [31][32][33][34][35][36][37][38][39][40][41][42][43][44][45].…”

Section: Introductionmentioning

confidence: 99%

The utility of the enhancement techniques for mapping subsurface structures from gravity data

Pham¹,

Xuan²,

Eldosouky³

et al. 2021

Frontiers in Scientific Research and Technology

View full text Add to dashboard Cite

An important feature in the interpretation of gravity data is the determination of the edges of the density structures. There are several different enhancement techniques used to achieve the edge locations. In this study, we aim to estimate the effectiveness of some edge enhancement techniques such as the total horizontal gradient, analytic signal, theta map, and logistic function of the total horizontal gradient in terms of their accuracy on detection of subsurface structures from gravity data. These methods were tested on synthetic gravity data with and without noise. Findings show that the logistic function of the total horizontal gradient performs better than other methods under almost all cases. Additionally, the methods are also applied to real gravity data from the Phu Khanh basin as a practical example. The results determined by the LTHG technique reveals the presence of many structures with E-W, NE-SW, NNW-SSE, ENE-WSW, and NNE-SSW trends in the basin.

show abstract

Comparison of different approaches of computing the tilt angle of the total horizontal gradient and tilt angle of the analytic signal amplitude for detecting source edges

Cited by 11 publications

References 30 publications

Exploring Heat Sources Using Gravimetric Data: A Case Study of Magadi Geothermal Prospect, Kenya

Exploring Heat Sources Using Gravimetric Data: A Case Study of Magadi Geothermal Prospect, Kenya

Estimating Effectiveness of Some Methods for Detecting Edge of Potential Field Sources

The utility of the enhancement techniques for mapping subsurface structures from gravity data

Contact Info

Product

Resources

About