Gravity terrain corrections — an overview

Nowell, David

doi:10.1016/s0926-9851(99)00028-2

Cited by 81 publications

(57 citation statements)

References 48 publications

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“…Since this practice was established, a radius of 167 km has become a widely adopted standard (Nowell, 1999). The effect of this difference was evaluated by comparing terrain corrections for the Wilson River test data set with outer radii of 22 and 167 km respectively.…”

Section: Effect Of Outer Terrain Correction Radiusmentioning

confidence: 99%

“…Limiting the TC computation radius to 22 km results in underestimation of the terrain effect by an average of 1.27 mGal for the test data set, compared to the 167 km radius standard. As described by Nowell (1999), station height becomes the dominant control on the terrain correction for distances beyond 22 km. Thus the effect of calculating TC to the larger radius is clearly greatest for the most elevated stations (compare Figure 9 with Figure 1).…”

Section: Effect Of Outer Terrain Correction Radiusmentioning

confidence: 99%

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Revising gravity terrain corrections in Tasmania

Duffett

2016

ASEG Extended Abstracts

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SUMMARYTerrain corrections for determination of the complete Bouguer anomaly are empirically evaluated with respect to a number of different techniques, parameters and digital terrain model data sets, for areas in western and northern Tasmania.For the most part, while terrain corrections calculated from very high resolution terrain models (1.2 metres or better) are presumed to deliver the most accurate results, those computed for the same area using only a Statewide 25 metre-cell digital terrain model to within two metres of gravity stations correspond remarkably well. Internally consistent comprehensive terrain correction of acceptable yet maximal accuracy can therefore be calculated for all Tasmanian gravity stations, even if very high resolution DTMs are unavailable.Fully automatic terrain correction computation from two metres to 167 kilometres from gravity stations will result in significantly improved removal of topographic effects over extant manual corrections, which were limited to 22 kilometres.

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Section: Effect Of Outer Terrain Correction Radiusmentioning

confidence: 99%

Section: Effect Of Outer Terrain Correction Radiusmentioning

confidence: 99%

Revising gravity terrain corrections in Tasmania

Duffett

2016

ASEG Extended Abstracts

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“…In the computations terrain computations to a distance of 22 km around point station were considered. The outer limit for the terrain computations is 25 km because the distant topography beyond 22 km must be adjusted for the curvature of the Earth and can sometimes produce negative terrain effects (Nowell, 1999). Figure 3 shows the probable crustal structure across the Central Ranges in the NE-SW orientation after Ikami et al (1986).…”

Section: Geological Backgroundmentioning

confidence: 99%

Gravity inversion modeling across a 2-D dike-like structure—A Case Study

Ateya

Takemoto²

2014

Earth Planet Sp

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Gravity investigations do have certain known limitations, the two most prominent perhaps being deep resolution and the non-uniqueness of the solution. We utilized the principle of the physical geometry a two-dimensional dike in the inversion process across tectonic line in the Chubu District, Honshu-in the Japan Alps. The location is probably where the Tsunan-Matsumoto tectonic line interacts with the Itoigawa-Shizuoka Tectonic Line (ISTL). Two-dimensional modeling results consistent with previous works on gravity and reflection and/or refraction prospecting are given to depict the probable sub-surface structure. We conclude that the Bouguer gravity anomaly low to the Southwest or Western side of the tectonic trace is due to thrust of lower density sedimentary rocks deeper into the higher density lower crust to a depth range of approximately 3.5∼4.0 km below the Earth surface.

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“…It is calculated from gravity data after several corrections are applied. The corrections are the following: instrumental and tide drift corrections, theoretical gravity value calculation (or latitude correction), free air correction, plateau correction (depending on density correction value ρ cor ) and topography correction (also with ρ cor ) (Chapin, 1996;LaFehr, 1991;Nowell, 1999;Telford et al, 1976). The topography correction was calculated using a high-resolution 50 cm DTM (Digital Terrain Model) with a vertical precision of 10 cm.…”

Section: High-resolution Gravity Surveymentioning

confidence: 99%

Inner structure of the Puy de Dôme volcano: cross-comparison of geophysical models (ERT, gravimetry, muon imaging)

Portal

Labazuy

Lénat

et al. 2013

Geosci. Instrum. Method. Data Syst.

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Abstract. Muon imaging of volcanoes and of geological structures in general is actively being developed by several groups in the world. It has the potential to provide 3-D density distributions with an accuracy of a few percent. At this stage of development, comparisons with established geophysical methods are useful to validate the method. An experiment has been carried out in 2011 and 2012 on a large trachytic dome, the Puy de Dôme volcano, to perform such a comparison of muon imaging with gravimetric tomography and 2-D electrical resistivity tomography. Here, we present the preliminary results for the last two methods.North-south and east-west resistivity profiles allow us to model the resistivity distribution down to the base of the dome. The modelling of the Bouguer anomaly provides models for the density distribution within the dome that are directly comparable with the results from the muon imaging. Our ultimate goal is to derive a model of the dome using the joint interpretation of all sets of data.

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Gravity terrain corrections — an overview

Cited by 81 publications

References 48 publications

Revising gravity terrain corrections in Tasmania

Revising gravity terrain corrections in Tasmania

Gravity inversion modeling across a 2-D dike-like structure—A Case Study

Inner structure of the Puy de Dôme volcano: cross-comparison of geophysical models (ERT, gravimetry, muon imaging)

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