Full-tensor gravity gradient eigenvector analysis for locating complex geological source positions

Zuo, Boxin; Kass, M. Andy; Geng, Meixia

doi:10.5194/npg-2016-75

Cited by 3 publications

(1 citation statement)

References 18 publications

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“…Zhou (2016) used a ratio of gravity and full tensor gradient invariants for depth estimation. Zuo et al (2017) used gravity gradients for determining the position of complex subsurface geological structures.…”

Section: Introductionmentioning

confidence: 99%

Analysis of gravity disturbance for boundary structures in the Aegean Sea and Western Anatolia

Doğru

Pamukçu

2019

Geofizika

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Western Anatolia has been shaped N–S-trending extensional tectonic regime and W-E trending horst, grabens and active faults due to the collision of Africa, Arabian and Eurasia plates. The borders of the Aegean Sea tectonic is limited between eastern of Greece, western of Anatolia and Hellenic subduction zone in the south of Crete. To evaluate these tectonic elements gravity disturbance data of the Aegean Sea and Western Anatolia was used in this study. It is thought that the gravity disturbance data reflects the tectonic elements and discontinuities way better than gravity anomaly due to the calculation from the difference between gravity and normal gravity at the same point so thus the tensors and invariants of the study area were calculated and the power spectrum method was applied to the gravity disturbance data. Various boundary analysis methods were applied to the gravity disturbance data to compare the discontinuities obtained from the tensors both theoretical and case study. These methods were tested initially on theoretical data. Within the scope of the theoretical study, a single model and three bodies model were taken into consideration. When the results are examined, it is observed that the Tzz tensor component gives very clear information about the location of the structure. Likewise, when the Txx, Tyy components and invariant results are examined, the vertical and horizontal boundaries were successfully obtained. In addition, the mean depths of these structures were determined using the power spectrum method. In the case application stage, the gravity disturbance data obtained from the Earth Gravitational Model of the eastern of the Aegean Sea and western of Anatolia were evaluated. The tensor and invariants of this gravity disturbance data were first calculated. New possible discontinuities have been identified in the tensors and some of the obtained discontinuities were clarified in their previous discussions. Also, the mean depths of the possible structures were calculated by the power spectrum method at four profiles taken from gravity disturbance data. These depth values are consistent with the depth values of the structural discontinuities obtained from previous studies. Finally, the upward continuation was applied to Tyy, Tyz and Tzz tensors up to 20 km. The positive anomaly values in Tyz and Tzz components and negative anomaly values in Tyy component are consistent with the Western Anatolia Transfer Zone. The structural differences between the eastern and the western of Western Anatolia are noteworthy in the upward continued results of the tensors. In addition, the positive and negative anomalies are notable in areas where the big earthquakes occurred in the last 3 years in the Tyz invariants.

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Section: Introductionmentioning

confidence: 99%

Analysis of gravity disturbance for boundary structures in the Aegean Sea and Western Anatolia

Doğru

Pamukçu

2019

Geofizika

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Subsurface geology detection from application of the gravity-related dimensionality constraint

Karimi,

Kletetschka

2024

Sci Rep

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Geophysics aims to locate bodies with varying density. We discovered an innovative approach for estimation of the location, in particular depth of a causative body, based on its relative horizontal dimensions, using a dimensionality indicator (I). The method divides the causative bodies into two types based on their horizontal spread: line of poles and point pole (LOP–PP) category, and line of poles and plane of poles (LOP–POP) category; such division allows for two distinct solutions. The method’s depth estimate relates to the relative variations of the causative body’s horizontal extent and leads to the solutions of the Euler Deconvolution method in specific cases. For causative bodies with limited and small depth extent, the estimated depth (z^0) corresponds to the center of mass, while for those with a large depth extent, z^0 relates to the center of top surface. Both the depth extent and the dimensionality of the causative body influence the depth estimates. As the depth extent increases, the influence of I on the estimated depth is more pronounced. Furthermore, the behavior of z^0 exhibits lower errors for larger values of I in LOP–POP solutions compared with LOP–PP solutions. We tested several specific model scenarios, including isolated and interfering sources with and without artificial noise. We also tested our approach on real lunar data containing two substantial linear structures and their surrounding impact basins and compared our results with the Euler deconvolution method. The lunar results align well with geology, supporting the effectiveness of this approach. The only assumption in this method is that we should choose between whether the gravity signal originates from a body within the LOP–PP category or the LOP–POP category. The depth estimation requires just one data point. Moreover, the method excels in accurately estimating the depth of anomalous causative bodies across a broad spectrum of dimensionality, from 2 to 3D. Furthermore, this approach is mathematically straightforward and reliable. As a result, it provides an efficient means of depth estimation for anomalous bodies, delivering insights into subsurface structures applicable in both planetary and engineering domains.

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Using Gravity Potential Field and Inertial Navigation System in Real Time Submarine Positioning

Rogobete¹,

Tărăbuţă

Rogobete

et al. 2018

IOP Conf. Ser.: Earth Environ. Sci.

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Full-tensor gravity gradient eigenvector analysis for locating complex geological source positions

Cited by 3 publications

References 18 publications

Analysis of gravity disturbance for boundary structures in the Aegean Sea and Western Anatolia

Analysis of gravity disturbance for boundary structures in the Aegean Sea and Western Anatolia

Subsurface geology detection from application of the gravity-related dimensionality constraint

Using Gravity Potential Field and Inertial Navigation System in Real Time Submarine Positioning

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