Depth Estimation Using the Tilt Angle of Gravity Field due to the Semi-Infinite Vertical Cylindrical Source

Tilt angle filter is an interpretation method that is used to determine the source borders locations from potential fields data. Moreover, the tilt angle is applied for estimation of the anomaly source depth, such as contact-depth method and tilt-depth method. In this paper an application of the tilt angle technique obtained from the first vertical and horizontal gradients of the gravity anomaly from semi-infinite vertical cylindrical source is described. The technique is based on the tilt angle and derivatives ratio. In this approach the depth estimates are proportional to the computed tilt angles and their distances from the cross section center of the anomaly cause on the surface. This new method is termed the tilt-distance-depth (TDD). The method is demonstrated using synthetic gravity data, with and without random noise, and real gravity data from Iran. The results are also compared with the solutions from Euler deconvolution technique and inverse modelling using Modelvision software.

Download Full-text

Tensor deconvolution: A method to locate equivalent sources from full tensor gravity data

Geophysics ◽

10.1190/1.2749317 ◽

2007 ◽

Vol 72 (5) ◽

pp. I61-I69 ◽

Cited By ~ 38

Author(s):

Valentin Mikhailov ◽

Gwendoline Pajot ◽

Michel Diament ◽

Antony Price

Keyword(s):

Gravity Field ◽

Gravity Data ◽

Random Noise ◽

Depth Estimation ◽

Observation Point ◽

Euler Deconvolution ◽

Structural Index ◽

Measuring Device ◽

Equivalent Sources ◽

Scalar Invariants

We present a method dedicated to the interpretation of full tensor (gravity) gradiometry (FTG) data called tensor deconvolution. It is especially designed to benefit from the simultaneous use of all the FTG components and of the gravity field. In particular, it uses tensor scalar invariants as a basis for source location. The invariant expressions involve all of the independent components of the tensor. This method is a tensor analog of Euler deconvolution, but has the following advantages compared to the conventional Euler deconvolution method: (1) It provides a solution at every observation point, without the use of a sliding window. (2) It determines the structural index automatically; as a consequence, the structural index follows the variations of the field morphology. (3) It uses all components of the measured full gradient tensor and gravity field, thus reducing errors caused by random noise. It is based on scalar invariants that are by nature insensitive to the orientation of the measuring device. We tested our method on both noise-free and noise-contaminated data. These tests show that tensor solutions cluster in the vicinity of the center of causative bodies, whereas Euler solutions better outline their edges. Hence, these methods should be combined for improved contouring and depth estimation. In addition, we use a clustering method to improve the selection of solutions, which proves advantageous when data are noisy or when signals from close causative bodies interfere.

Download Full-text

Spectral analysis and Euler deconvolution technique of gravity data to decipher the basement depth in the Dehradun-Badrinath area

Journal of the Geological Society of India ◽

10.1007/s12594-014-0077-3 ◽

2014 ◽

Vol 83 (5) ◽

pp. 501-512 ◽

Cited By ~ 5

Author(s):

G. K. Ghosh ◽

C. L. Singh

Keyword(s):

Spectral Analysis ◽

Gravity Data ◽

Euler Deconvolution ◽

Deconvolution Technique ◽

Basement Depth

Download Full-text

The Use of Euler Deconvolution Technique in the Estimation of Depth to Magnetic Source Bodies around the Schist Belt Parts of Kano State, Nigeria

Jordan Journal of Physics ◽

10.47011/14.1.2 ◽

2021 ◽

Vol 14 (1) ◽

pp. 19-23

Keyword(s):

Depth Estimation ◽

Magnetic Survey ◽

Schist Belt ◽

Euler Deconvolution ◽

Depth Estimate ◽

Paper Detail ◽

Magnetic Source ◽

Deconvolution Technique ◽

Proton Precession Magnetometer ◽

Ground Magnetic

Abstract: Depth estimation of magnetic source bodies in parts of the Schist Belt of Kano, using Euler Deconvolution is presented in this paper. Detail ground magnetic survey was carried out using SCINTREX proton precession magnetometer to produce the Total Magnetic Intensity (TMI) map and consequently the residual map. The TMI ranges from 34,261 nT to 34,365 nT, while the residual field ranges from -160 nT to 115 nT. The depth estimate for contacts ranges from 6.5 m to 39.8 m, while that of dyke ranges from 8.9 m to 51.3 m. The depth estimation presented in this work is compared with the results of aeromagnetic study carried out in the same area and found to agree fairly well. Further, this also ensures the validity of aeromagnetic investigation in such applications. Keywords: Contacts, Dykes, Euler Deconvolution, Schist Belt. PACS: 91.25.F and 91.25.Rt.

Download Full-text

Role of Discretization Parameters in Source Depth Estimation Using Tikhonov's Downwards Continuation of Potential Fields

78th EAGE Conference and Exhibition 2016 ◽

10.3997/2214-4609.201601298 ◽

2016 ◽

Author(s):

R. Pasteka ◽

D. Kušnirák ◽

P. Zahorec ◽

J. Papčo

Keyword(s):

Depth Estimation ◽

Potential Fields ◽

Source Depth

Download Full-text

Weighted Euler deconvolution of gravity data

Geophysics ◽

10.1190/1.1444456 ◽

1998 ◽

Vol 63 (5) ◽

pp. 1595-1603 ◽

Cited By ~ 53

Author(s):

Pierre B. Keating

Keyword(s):

Euler Equations ◽

Gravity Data ◽

Error Function ◽

Bouguer Anomaly ◽

Depth Estimation ◽

Euler Deconvolution ◽

Structural Index ◽

Eastern Canada ◽

Adequate Sampling

Euler deconvolution is used for rapid interpretation of magnetic and gravity data. It is particularly good at delineating contacts and rapid depth estimation. The quality of the depth estimation depends mostly on the choice of the proper structural index and adequate sampling of the data. The structural index is a function of the geometry of the causative bodies. For gravity surveys, station distribution is in general irregular, and the gravity field is aliased. This results in erroneous depth estimates. By weighting the Euler equations by an error function proportional to station accuracies and the interstation distance, it is possible to reject solutions resulting from aliasing of the field and less accurate measurements. The technique is demonstrated on Bouguer anomaly data from the Charlevoix region in eastern Canada.

Download Full-text