Edge enhancement of potential field data using an enhanced tilt angle

Zhang, Xu; Yu, Peng; Tang, Rui; Xiang, Yang; Zhao, Chongjin

doi:10.1071/eg13104

Cited by 39 publications

(14 citation statements)

References 17 publications

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“…The horizontal gravity gradient method and vertical gravity gradient method (e.g., Evjen 1936;Elkins 1951;Tsuboi and Kato 1952;Blakely and Simpson 1986) are classic edge emphasis techniques. In recent years, higher and keener extraction techniques have been suggested (e.g., Miller and Singh 1994;Cooper and Cowan 2006;Sertcelik and Kafadar 2012;Zhang et al 2014). In addition, attention has been paid to techniques that evaluate the shape of the potential field (e.g., Koenderink and van Doorn 1992;Robert 2001;Zhou et al 2013;Cevallos 2014).…”

Section: Introductionmentioning

confidence: 99%

Eigenvector of gravity gradient tensor for estimating fault dips considering fault type

Kusumoto

2017

Prog. in Earth and Planet. Sci.

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The dips of boundaries in faults and caldera walls play an important role in understanding their formation mechanisms. The fault dip is a particularly important parameter in numerical simulations for hazard map creation as the fault dip affects estimations of the area of disaster occurrence. In this study, I introduce a technique for estimating the fault dip using the eigenvector of the observed or calculated gravity gradient tensor on a profile and investigating its properties through numerical simulations. From numerical simulations, it was found that the maximum eigenvector of the tensor points to the high-density causative body, and the dip of the maximum eigenvector closely follows the dip of the normal fault. It was also found that the minimum eigenvector of the tensor points to the low-density causative body and that the dip of the minimum eigenvector closely follows the dip of the reverse fault. It was shown that the eigenvector of the gravity gradient tensor for estimating fault dips is determined by fault type. As an application of this technique, I estimated the dip of the Kurehayama Fault located in Toyama, Japan, and obtained a result that corresponded to conventional fault dip estimations by geology and geomorphology. Because the gravity gradient tensor is required for this analysis, I present a technique that estimates the gravity gradient tensor from the gravity anomaly on a profile.

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Section: Introductionmentioning

confidence: 99%

Eigenvector of gravity gradient tensor for estimating fault dips considering fault type

Kusumoto

2017

Prog. in Earth and Planet. Sci.

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“…In recent years, more sensitive and keen methods have been developed, and their extraction abilities have been investigated (e.g., [25,26]). Li et al [25] evaluated the extraction abilities of existing semi-automatic interpretation methods by numerical tests and pointed out following characteristics.…”

Section: The Gravity Anomaly and Its Interpretationsmentioning

confidence: 99%

“…For evaluating extraction ability, Li et al [25] and Zhang et al [26] employed the cube model and the rectangular parallelepiped model, which have vertical structural boundaries.…”

Section: The Gravity Anomaly and Its Interpretationsmentioning

confidence: 99%

Inconsistent Structure and Motion of the Eastern Median Tectonic Line, Southwest Japan, during the Quaternary

Kusumoto¹,

Takemura²,

Itoh³

2017

Evolutionary Models of Convergent Margins - Origin of Their Diversity

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The Median Tectonic Line (MTL) is the largest tectonic line in southwest Japan, and its eastern portion has moved as a right-lateral fault with a reverse fault component during the Quaternary. Although a high dip of the MTL has been suggested from geomorphological studies, reflection surveys have indicated a low dip of 30-55°. Thus, the MTL shows contradiction between its fault dip and fault motion. In this study, we attempted to re-estimate the dip of the MTL by gravity anomaly, gravity gradient tensor, and numerical simulation, restoring topographies caused by lateral faulting. The numerical simulations suggested that a fault dip of 70-75° is a reasonable dip of the MTL. These high-dip faults are able to move as a lateral fault and have the possibility of reverse fault motion. Deformation patterns caused by faults with these dips are in harmony with the accumulated geological and geomorphological evidence for motions of the MTL. On the other hand, gravity and gravity gradient analyses showed only a material boundary with low dip. This suggested that the MTL does not have conspicuous density contrast at the boundary.

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“…And, Ferreira et al [49] Using numerical tests, Zhang et al [50] showed that the ILP and the TAHG successfully extract the edges of potential field data relating to multi subsurface structures, and they also suggested a more sensitive edge detection method, THVH. The THVH is defined as follows:…”

Section: Edge Emphasismentioning

confidence: 99%

Structural Analysis of Calderas by Semiautomatic Interpretation of the Gravity Gradient Tensor: A Case Study in Central Kyushu, Japan

Kusumoto¹

2016

Updates in Volcanology - From Volcano Modelling to Volcano Geology

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In order to understand the formation history and mechanism of volcanoes and their related structures, including calderas, their subsurface structures play an important role. In recent years, gravity gradiometry survey has been introduced, and new analyses techniques for gravity gradient tensors obtained by the survey have been developed. In this chapter, we first describe the gravity gradient tensor and its characteristics, and the method for obtaining the tensor from the gravity anomaly. Next, we review the semiautomatic interpretation methods for extracting information on subsurface structures, and apply some of the techniques to the volcanic zone of central Kyushu, Japan. The results showed that the horizontal and vertical gravity gradient methods, and the CLP method were useful for extracting outlines of important volcanic and tectonic structures in this region. Using the maximum eigenvector of the gravity gradient tensor, the caldera wall dip of the Aso caldera was successfully estimated to be in the range of 50-70°, and the dip of the Median Tectonic Line which was the largest tectonic line in the southwest Japan was consistent with seismic reflection surveys. In addition, a large circular structure surrounding the Shishimuta caldera with a diameter of 35 km was distinguished in some analyses.

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Edge enhancement of potential field data using an enhanced tilt angle

Cited by 39 publications

References 17 publications

Eigenvector of gravity gradient tensor for estimating fault dips considering fault type

Eigenvector of gravity gradient tensor for estimating fault dips considering fault type

Inconsistent Structure and Motion of the Eastern Median Tectonic Line, Southwest Japan, during the Quaternary

Structural Analysis of Calderas by Semiautomatic Interpretation of the Gravity Gradient Tensor: A Case Study in Central Kyushu, Japan

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