New discrimination techniques for Euler deconvolution

FitzGerald, Desmond; Reid, Alan; McInerney, P.

doi:10.1016/j.cageo.2004.03.006

Cited by 132 publications

(48 citation statements)

References 11 publications

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“…The amount of clustered source points can be reduced by statistical criteria to obtain the most reliable results. Source points were selected according to three criteria: minimum standard deviation (Thompson 1982), the minimum condition number from a singular value decomposition (FitzGerald et al 2004), and points with the smallest error from the Euler equation (Cooper 2004). For the study area, we calculated Euler source points with SI = 0, 1, 2 and different window sizes 100, 200, 500 km in order to include long and very long wavelengths in the anomalies.…”

Section: Euler-deconvolutionmentioning

confidence: 99%

A 3-D lithospheric model of the Caribbean-South American plate boundary

Sanchez

Götze

Schmitz

2010

Int J Earth Sci (Geol Rundsch)

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A 3-D structural model of the Caribbean-South American plate boundary was constructed by gravity modeling. The model was constrained by four wide-angle seismic refraction sections, Moho depth estimations from receiver functions, and additionally seismological hypocenters, surface geology, and geodynamic information. Density values were calculated from empirical velocitydensity functions, and mineralogical-chemical composition considering specific P/T conditions. We tested different structural models for Western and Eastern Venezuela. In the final model, the fit of the measured and modeled gravity fields for a long Caribbean slab in Western Venezuela was better than the fit obtained for a short one. This interpretation is consistent with the constraining data. The slab is interpreted to extend further to the south beneath Northern Colombia and culminates in the area of the seismic cluster of the Bucaramanga nest. The modeling estimates a slab dip angle under Maracaibo and Mérida Andes of 15°, which increases to 32°below 100 km depth. The dip direction of approx. N150°E ± 5 increases lightly eastward. In Eastern Venezuela, considering its short wavelength, lineaments analyzed from gravity data (by curvature methods and Euler deconvolution) seem to be related to shallow structures and density contrast in the Serranía del Interior and not from a deep detached slab beneath the continental crust. It is deduced from modeling results that this slab configuration has a very small influence on the gravity field. The slab was modeled according to the subduction-transform propagation model with purely westward subduction and a slab break off along a vertical dip-slip tear through the lithosphere.

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Section: Euler-deconvolutionmentioning

confidence: 99%

A 3-D lithospheric model of the Caribbean-South American plate boundary

Sanchez

Götze

Schmitz

2010

Int J Earth Sci (Geol Rundsch)

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“…Li (2003) selects a single anomaly and applies the Euler deconvolution to this selected anomaly by using a single data window. FitzGerald et al (2004) present a comprehensive review of practical techniques that are usually used to distinguish reliable from spurious Euler solutions. Jekeli (2009) shows that the ad hoc criterion often used to accept Euler solutions (Reid et al, 1990) yields better results than the probabilistically founded test (using the Student and Fisher distributions for random variables) that determines whether an estimate of a parameter is reasonably consistent.…”

Section: Introductionmentioning

confidence: 99%

Estimating the nature and the horizontal and vertical positions of 3D magnetic sources using Euler deconvolution

et al. 2013

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We have developed a new method that drastically reduces the number of the source location estimates in Euler deconvolution to only one per anomaly. Our method employs the analytical estimators of the base level and of the horizontal and vertical source positions in Euler deconvolution as a function of the x-and y-coordinates of the observations. By assuming any tentative structural index (defining the geometry of the sources), our method automatically locates plateaus, on the maps of the horizontal coordinate estimates, indicating consistent estimates that are very close to the true corresponding coordinates. These plateaus are located in the neighborhood of the highest values of the anomaly and show a contrasting behavior with those estimates that form inclined planes at the anomaly borders. The plateaus are automatically located on the maps of the horizontal coordinate estimates by fitting a first-degree polynomial to these estimates in a moving-window scheme spanning all estimates. The positions where the angular coefficient estimates are closest to zero identify the plateaus of the horizontal coordinate estimates. The sample means of these horizontal coordinate estimates are the best horizontal location estimates. After mapping each plateau, our method takes as the best structural index the one that yields the minimum correlation between the total-field anomaly and the estimated base level over each plateau. By using the estimated structural index for each plateau, our approach extracts the vertical coordinate estimates over the corresponding plateau. The sample means of these estimates are the best depth location estimates in our method. When applied to synthetic data, our method yielded good results if the bodies produce weak-and mid-interfering anomalies. A test on real data over intrusions in the Goiás Alkaline Province, Brazil, retrieved sphere-like sources suggesting 3D bodies.

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“…(1) solutions with the lowest standard deviation (Thompson 1982); (2) solutions with the lowest condition number resulting from a singular value decomposition procedure that is used for solving the system of equations (Fitzgerald et al 2004); (3) solutions from the Euler interpretation equation with the smallest error (Cooper 2004).…”

Section: Euler-deconvolutionmentioning

confidence: 99%

Intrusion versus inversion—a 3D density model of the southern rim of the Northwest German Basin

Bilgili¹,

Götze²,

Pašteka

et al. 2007

Int J Earth Sci (Geol Rundsch)

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An unsolved problem of regional importance for both the evolution and structure of the Northwest German Basin is the existence or non-existence of the socalled Bramsche Massif. Explaining the nature of this massif and the cause of a related strong, positive Bouguer anomaly (Bramsche Anomaly) is critical. In the study described here, we tested an existing ''intrusion model'' against a newer ''inversion model'' in the southern Northwest German Basin. In the intrusion model, the strongly-positive Bouguer anomaly represents the gravity effect of an intrusion at depths between 6 and 10 km. More recent interpretations invoke tectonic inversion rather than intrusion to explain increased burial and the low level of hydrocarbon maturity found in boreholes. We tested these different interpretations by constructing 3D forward density models to 15 km depth. The intrusion model was updated and adjusted to incorporate recent data and we also modelled pre-Zechstein structures using different scenarios. The final model has a very good fit between measured and modelled gravity fields. Based on currently available seismic and structural models, as well as borehole density measurements, we show that the positive Bouguer anomaly cannot be modeled without a high-density, intrusive-like body at depth. However, further in-sight into the crustal structures of the Bramsche region requires more detailed investigations.

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New discrimination techniques for Euler deconvolution

Cited by 132 publications

References 11 publications

A 3-D lithospheric model of the Caribbean-South American plate boundary

A 3-D lithospheric model of the Caribbean-South American plate boundary

Estimating the nature and the horizontal and vertical positions of 3D magnetic sources using Euler deconvolution

Intrusion versus inversion—a 3D density model of the southern rim of the Northwest German Basin

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