Weighted Euler deconvolution of gravity data

Keating, Pierre

doi:10.1190/1.1444456

Cited by 84 publications

(38 citation statements)

References 11 publications

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“…Euler deconvolution is used for rapid interpretation of gravity data. It is particularly good at delineating contacts and rapid depth estimation (Keating 1998;Roy et al 2000). Before apply Euler deconvolution to the gravity data, a 500-m upward continuation is applied to the Bouguer gravity grid (Fig.…”

Section: Gravity Survey In Chingshui Areamentioning

confidence: 99%

Insight into the Geothermal Structure in Chingshui, Ilan, Taiwan

Lin¹,

Ouyang²,

Guo³

et al. 2008

Terr. Atmos. Ocean. Sci.

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The Chingshui geothermal field is the largest known productive geothermal area in Taiwan. The purpose of this paper is to delineate this geothermal structure by integrating geophysical data and borehole information. The existence of a magma chamber in the shallow crust and shallow intrusive igneous rock results in a high heat flow and geothermal gradient; furthermore, the NE deep fault system within the meta-sandstones provides meteoric recharge from a higher elevation to artesianally drive the geothermal system. There is evidence that geothermal fluid deeply circulated within the fracture zone and was heated by a deeply located body of hot rock. The geothermal reservoir of the Chingshui geothermal field might be related to the fracture zone of the Chingshuihsi fault. It is bounded by the C-fault in the north and Xiaonanao fault in the south. Based on information obtained from geophysical interpretations and well logs, a 3-D geothermal conceptual model is constructed in this study. Further, the geothermal reservoir is confined to an area that is 260 m in width, N21°W, 1.5 km in length, and has an 80°dip toward the NE. A high-temperature zone is found in the SE region of the reservoir, which is about 500 m in length; this zone is located near the intersection of the Chingshuihsi and Xiaonanao faults. An area on the NE side of the high-temperature zone has been recommended for the drilling of production wells for future geothermal development.

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Section: Gravity Survey In Chingshui Areamentioning

confidence: 99%

Insight into the Geothermal Structure in Chingshui, Ilan, Taiwan

Lin¹,

Ouyang²,

Guo³

et al. 2008

Terr. Atmos. Ocean. Sci.

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show abstract

“…In August 1994, the coverage was completed using a LaCoste and Romberg dynamic gravimeter installed on a small boat. Offshore, the Bouguer anomaly is now better resolved than that on land [Keating, 1998;Figure 3].…”

Section: Geophysical Data Setsmentioning

confidence: 99%

Complex faulting confounds earthquake research in the Charlevoix Seismic Zone, Quebec

Lamontagne¹,

Keating²,

Toutin³

2000

EoS Transactions

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Following every earthquake felt in eastern North America, journalists ask the eternal question, “Which fault is responsible for this earthquake?” In intraplate environments,such as the Charlevoix Seismic Zone (CSZ), Quebec, Canada, a definite answer seldom exists. Seismologists face major difficulties: most earthquakes occur at mid‐crustal depths, the Precambrian basement where most earthquakes occur is geologically complex, and fault locations are poorly known. Fortunately, seismologists receive help from other geoscientific fields and exploration techniques, most notably remote sensing, seismic methods, and potential fields. The integration of these geophysical tools is helping us to better understand the earthquake‐fault connection in the CSZ, which is eastern Canada's most seismically active zone. Most microearthquakes— the type that occur frequently in the CSZ—occur within highly fractured blocks bounded by regional geological faults. Our interpretation is different from the common assumption that earthquakes, independent of their size, occur along regional faults.

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“…Reid et al (1990) extends the method to three dimensions and discusses its applicability to gravity anomalies of finite steps and magnetic anoma- lies of thin dikes and sloping contacts. Keating (1998) applies the Euler approach to irregular 3D grids, using weights proportional to station accuracy and interstation distance. Zhang et al (2000) use the method to interpret gravity gradient tensor measurements.…”

Section: Introductionmentioning

confidence: 99%

Application of artificial intelligence for Euler solutions clustering

et al. 2003

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Results of Euler deconvolution strongly depend on the selection of viable solutions. Synthetic calculations using multiple causative sources show that Euler solutions cluster in the vicinity of causative bodies even when they do not group densely about the perimeter of the bodies. We have developed a clustering technique to serve as a tool for selecting appropriate solutions.The clustering technique uses a methodology based on artificial intelligence, and it was originally designed to classify large data sets. It is based on a geometrical approach to study object concentration in a finite metric space of any dimension. The method uses a formal definition of cluster and includes free parameters that search for clusters of given properties.Tests on synthetic and real data showed that the clustering technique successfully outlines causative bodies more accurately than other methods used to discriminate Euler solutions. In complex field cases, such as the magnetic field in the Gulf of Saint Malo region (Brittany, France), the method provides dense clusters, which more clearly outline possible causative sources. In particular, it allows one to trace offshore the main inland tectonic structures and to study their interrelationships in the Gulf of Saint Malo.The clusters provide solutions associated with particular bodies, or parts of bodies, allowing the analysis of different clusters of Euler solutions separately. This may allow computation of average parameters for individual causative bodies. Those measurements of the anomalous field that yield clusters also form dense clusters themselves. Application of this clustering technique thus outlines areas where the influence of different causative sources is more prominent. This allows one to focus on these areas for more detailed study, using different window sizes, structural indices, etc.

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Weighted Euler deconvolution of gravity data

Cited by 84 publications

References 11 publications

Insight into the Geothermal Structure in Chingshui, Ilan, Taiwan

Insight into the Geothermal Structure in Chingshui, Ilan, Taiwan

Complex faulting confounds earthquake research in the Charlevoix Seismic Zone, Quebec

Application of artificial intelligence for Euler solutions clustering

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