Depth Estimates for Slingram Electromagnetic Anomalies from Dipping Sheet-like Bodies by the Normalized Full Gradient Method

Dondurur, Derman

doi:10.1007/s00024-005-2711-x

Cited by 33 publications

(35 citation statements)

References 20 publications

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“…The degree of the NFG can be taken as 1, 2, 4, etc. m = 1 is generally used for potential field (AYDıN, 1997a) and electromagnetic data (DONDURUR, 2005) as is the case for the present study. Higher order values of the degree of the NFG were applied in seismic applications effectively by KARSLI (2001) using the width of the recorded signal to improve seismic resolution.…”

Section: Introductionmentioning

confidence: 99%

“…AYDıN (1997a), DONDURUR (2005) and KARSLI (2001) suggested that l = 1 or 2 gives reasonable results in the downward continuation, therefore, l = 1 is used in this study. In addition, the harmonic interval in equations (2), (7) and (8) is restricted to a lower limit of N 1 and an upper limit of N 2 .…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the harmonic interval in equations (2), (7) and (8) is restricted to a lower limit of N 1 and an upper limit of N 2 . This restricted processing was discussed by BEREZKIN (1988), AYDıN (1997a) and DONDURUR (2005). The N 1 and N 2 harmonic limits determined by these researchers were applied to gravity and electromagnetic data.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Interpretation of Gravity Anomalies with the Normalized Full Gradient (NFG) Method and an Example

Aydın

2007

Pure appl. geophys.

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The Normalized Full Gradient (NFG) method which was put forward about 50 years ago has been used for downward continuation of gravity potential data, especially in the former Union of Soviet Socialist Republics. This method nullifies perturbations due to the passage of mass depth during downward continuation. The method depends on the downwards analytical continuation of normalized full gradient values of gravity data. Analytical continuation discriminates certain structural anomalies which cannot be distinguished in the observed gravity field. This method has been used in various petroleum and tectonic studies. The Trapeze method was used for the determination of Fourier coefficients during the application of this method. No other techniques for calculating these coefficients have been used. However, the Filon method was used for the determination of Fourier coefficients during the application of the NFG method in this work. This method, rather than the Trapeze method, should be preferred for indicating abnormal mass resources at the lower harmonics. In this study, the NFG method using the Filon method has been applied the first time to theoretical models of gravity profiles as example field at the Hasankale-Horasan petroleum exploration province where successful results were achieved. Hydrocarbon presence was shown on the NFG sections by the application of NFG downward continuation operations on theoretical models. Important signs of hydrocarbon structure on the NFG section for field and model data at low harmonics are obtained more effectively using this method.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Interpretation of Gravity Anomalies with the Normalized Full Gradient (NFG) Method and an Example

Aydın

2007

Pure appl. geophys.

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“…The method eliminates the side oscillations which appeared on the continuation curves when passing through an anomalous body depth (Dondurur 2005;Sindirgi et al 2008;Aghajani et al 2009;Abedi et al 2012). The NFG operator G h x; z ð Þ constitutes the basic concept of the NFG method and is defined in two dimensions as…”

Section: Normalized Full Gravity Gradient Imagingmentioning

confidence: 99%

Gravity anomaly and crustal density structure in Jilantai rift zone and its adjacent region

Shen

Tan

et al. 2016

Earthq Sci

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This paper deals with the interpretation of Bouguer gravity anomalies measured along a 250 km long Suhaitu-Etuokeqi gravity profile located at the transitional zone of the Alxa and Ordos blocks where geophysical characteristics are very complex. The analysis is carried out in terms of the ratio of elevation and Bouguer gravity anomaly, the normalized full gradient of a section of the Bouguer gravity anomaly (G h ) and the crustal density structure reveal that (1) the ratio of highs and lows of elevation and Bouguer gravity anomaly is large between Zhengyiguan fault (F4) and Helandonglu fault (F6), which can be explained due to crustal inhomogeneities related to the uplift of the Qinghai-Tibet block in the northeast; (2) the main active faults correspond to the G h contour strip or cut the local region, and generally show strong deformation characteristics, for example the Bayanwulashan mountain front fault (F1) or the southeast boundary of Alxa block is in accord with the western change belt of G h , a belt about 10 km wide that extends to about 30 km; (3) YinchuanPingluo fault (F8) is the seismogenic structure of the Pingluo M earthquake, and its focal depth is about 15 km; (4) the Moho depth trend and Bouguer gravity anomaly variation indicates that the regional gravity field is strongly correlated with the Moho discontinuity.

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“…Areas of which normalized full gradient values are higher than 1, determine the localization of the structure (DONDURUR 2005;detailed in DONDURUR 2005;AYDIN 2007) In order to test the efficiency of the NFG method was applied to gravity effects of two cubes. For all of the three simple theoretical models, the profile length is chosen as 500 m while the structural locations of the models correspond to the midpoints of the profiles.…”

Section: )mentioning

confidence: 99%

Structure of the Hellenic Subduction Zone from Gravity Gradient Functions and Seismology

Gönenç

Akgün

2011

Pure Appl. Geophys.

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The Normalized Full Gradient (NFG) method has widespread applications in the analysis of potential fields, especially the gravity and magnetic fields. This method is used to identify the lateral and horizontal density variations in the crust and lithosphere. In this study, the NFG method was applied to the gravity data of the Cretan Arc and its surroundings. Because of the tectonic features of the eastern Mediterranean, the Cretan Arc and the neighboring areas are seismically very active. Especially the subduction zone and the complicated crustal features have been defined applying many different geophysical methods. In this study, first the NFG method is tested with synthetic prisms (two cubes). After that, the NFG method was applied to the Bouguer gravity data of the Cretan Arc and its subduction zone (Hellenic subduction zone) and Hellenic subduction zone was defined with the foci depth data (USGS) along the south-north direction. Thus, geometry of the focal depth distribution has been created to determine probable media depths and their localizations. According to the NFG results, vertical structural transitions were observed at a depth ranging between 10 and 180 km. Also, these results were compared with the foci depth model and the other results of the related publications. Finally, some considerations in vertical solution with the NFG method have been presented and locations of the different structures at horizontally have been defined with application of the NFG method.

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Depth Estimates for Slingram Electromagnetic Anomalies from Dipping Sheet-like Bodies by the Normalized Full Gradient Method

Cited by 33 publications

References 20 publications

Interpretation of Gravity Anomalies with the Normalized Full Gradient (NFG) Method and an Example

Interpretation of Gravity Anomalies with the Normalized Full Gradient (NFG) Method and an Example

Gravity anomaly and crustal density structure in Jilantai rift zone and its adjacent region

Structure of the Hellenic Subduction Zone from Gravity Gradient Functions and Seismology

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