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Full-Text Articles in Geophysics and Seismology
2d Inverse Modeling Of The Gravity Field Due To A Chromite Deposit Using The Marquardt’S Algorithm And Forced Neural Network, Ata Eshaghzadeh, Sanaz Seyedi Sahebari, Alireza Dehghanpour
2d Inverse Modeling Of The Gravity Field Due To A Chromite Deposit Using The Marquardt’S Algorithm And Forced Neural Network, Ata Eshaghzadeh, Sanaz Seyedi Sahebari, Alireza Dehghanpour
Bulletin of the Mineral Research and Exploration
In this paper, two modeling method are employed. First, a method based on the Marquardt’s algorithm is presented to invert the gravity anomaly due to a finite vertical cylinder source. The inversion outputs are the depth to top and bottom, and radius parameters. Second, Forced Neural Networks (FNN) for interpreting the gravity field as try to fit the computed gravity in accordance with the estimated subsurface density distribution to the observed gravity. To evaluate the ability of the methods, those are employed for analyzing the gravity anomalies from assumed models with different initial parameters as the satisfactory results were achieved. …
Simulation Of A Salt Dome Using 2d Linear And Nonlinear Inverse Modeling Of Residual Gravity Field Data, Soheyl Pourreza, Farnush Hajizadeh
Simulation Of A Salt Dome Using 2d Linear And Nonlinear Inverse Modeling Of Residual Gravity Field Data, Soheyl Pourreza, Farnush Hajizadeh
Bulletin of the Mineral Research and Exploration
In gravity field inversion we usually dealing with underdetermined problems and for obtaining realistic solutions can introduce a depth-weighting function to the inversion algorithm. We employ a linear inversion method for determining the underground density distribution of the gravity causative mass. The validation and accuracy of method is tested on two synthetic gravity anomaly from different models, while the data are noise- free and corrupted with noise. In this paper, We also invert the 2D gravity anomaly produced by a salt dome from the northwest of Iran. The salt domes in the region under investigation are a rich source of …
A Brief Note On The Effects Of Floating Standard Deviation (Non- Derivative) And Horizontal Gradient (Derivative) Filters, Ceyhan Ertan Toker
A Brief Note On The Effects Of Floating Standard Deviation (Non- Derivative) And Horizontal Gradient (Derivative) Filters, Ceyhan Ertan Toker
Bulletin of the Mineral Research and Exploration
When processing gravity data, the filters are used in space and frequency environments. The filters allow more selectable parameter estimations than raw data about the structure being examined. Filtering in a broad sense means monitoring the data under the constraints we want. While the filters allow some information to become more noticeable, they allow some information to be lost or become less noticeable from data. In this case, the losses in the data make the interpretation difficult and can cause errors. Derivative and phase filters provide quantitative information about the variation of data in different directions. The display of the …
The Reaction Of Physical Transformation Of The Gravity Data And Linearity Dilemma, Ertan Toker
The Reaction Of Physical Transformation Of The Gravity Data And Linearity Dilemma, Ertan Toker
Bulletin of the Mineral Research and Exploration
This paper consists of opinions on the article entitled as “Investigation of the Seismic Velocity Distribution and Crustal Structure of Turkey by means of Gravity Data” which was published on the page 185 of the 153rd issue of the Bulletin of Mineral Research and Exploration. Within this context, it was aimed at defining some dilemmas encountered in the article, which was targeted in the exploration of the crustal structure in plate scale by means of data sets, and informing the reader. Here, the interactive relationships of Gravity and Seismic methods of which each one are discipline of expertise will be …
Geophysical Regional Gravity Maps Of Turkey And Its General Assessment, Selim Arslan
Geophysical Regional Gravity Maps Of Turkey And Its General Assessment, Selim Arslan
Bulletin of the Mineral Research and Exploration
In this study, the maps generated from the regional gravity data, which had been measured within scope of “Türkiye Rejyonal Gravite Haritaları Projesi” (Regional Gravity Map of Turkey) project were introduced. The topography, Free Air, Bouguer gravity, isostatic residual, isostatic regional, density and crust thickness maps of Turkey in 1/1 500 000 scale were prepared using database which started in 1973 and ended in 2011. The boundaries of the main tectonic members were determined by crust thickness, isostatic residual and Bouguer gravity maps of Turkey. Within this scope, a database that will illuminate the investigation of crustal structure, the development …
Vertical And Horizantal Analysis Of Crustal Structure In Eastern Anatolia Region, Oya Pamukçu, Tolga Gönenç, Ayça Yurdakul Çirmik, Şevket Demi̇rbaş, Seyit Tosun
Vertical And Horizantal Analysis Of Crustal Structure In Eastern Anatolia Region, Oya Pamukçu, Tolga Gönenç, Ayça Yurdakul Çirmik, Şevket Demi̇rbaş, Seyit Tosun
Bulletin of the Mineral Research and Exploration
The tectonic regime of Eastern Anatolia is determined by Arabian-Eurasian continentcontinent convergence and the mechanism occurred with the convergence. North Anatolian Fault Zone (NAFZ), Eastern Anatolian Fault Zone (EAFZ), North Eastern Anatolian Faults and Bitlis Zagros Suture Zone are formed by this convergence, represent the characteristic of lithospheric structure of the region. In the scope of this study, the gravity anomalies of Eastern Anatolia were used for investigating the lithospheric structure. Firstly, second order trend analyses were applied to gravity data for examining the characteristic of the anomaly. Later, the vertical and horizontal derivatives methods were applied to the same …
Geophysical Analysis And Modelling Of The S‹Mav Basin, Western Anatolia, Ceyhan Ertan Toker
Geophysical Analysis And Modelling Of The S‹Mav Basin, Western Anatolia, Ceyhan Ertan Toker
Bulletin of the Mineral Research and Exploration
The various data processing techniques, to illuminate the parameters of the geological structure which are applied in gravity and magnetic potential field methods. Also edge detection procedures are in data processing techniques. In this study, 2D, 3D, inversion and asta technique is one of the new edge detection procedures were applied to clarify correlation between the Simav half graben’s deep position and geometry of the tectonic lineaments. The Asta is obtained using the tilt angle.
The Use Of Tilt Angle In Gravity And Magnetic Methods, Uğur Akin, Betül Işikdeni̇z Şeri̇foğlu, Mehmet Duru
The Use Of Tilt Angle In Gravity And Magnetic Methods, Uğur Akin, Betül Işikdeni̇z Şeri̇foğlu, Mehmet Duru
Bulletin of the Mineral Research and Exploration
Tilt angle method, which has been recently used in investigating the boundaries of structures, reveals useful information on deep and shallow structures. Tilt angle is expressed as the arctan value of the ratio of the vertical derivative of the potential field to its horizontal derivative. The method was applied to Kýrþehir-Ý31 Sheet. As a result, the presence of volcanites buried under terrestrial sediments was demonstrated.
Investigation Of Crustal Structure Of Turkey By Means Of Gravity Data, Selim Arslan, Uğur Akin, Atakan Alaca
Investigation Of Crustal Structure Of Turkey By Means Of Gravity Data, Selim Arslan, Uğur Akin, Atakan Alaca
Bulletin of the Mineral Research and Exploration
During this work, the regional gravity data acquired earlier were used and in order to investigate the relations between geology - tectonics and elevation, isostatic map of Turkey, free air anomaly map and Bouguer anomaly maps were obtained, and comparisons with respect to elevations were carried out. For the thickness of the earth crust T 0 32 - 0.08g relation was used. The best relation was obtained from Bouguer anomaly with +0.65 coefficient; the relation function was obtained as Y = - 72E + 7.77. Thickness of the crust of Turkey is estimated to be 31.4 km where it is …