High accuracy gravity terrain correction by Optimally Selecting Sectors algorithm based on Hammer charts method

Jahanjooy, Saber; Pirouei, Mohammad; Kolo, Kamal

doi:10.1007/s11200-019-0273-0

Cited by 2 publications

(1 citation statement)

References 18 publications

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“…The terrain correction arose due to the change of the topography on the gravitational field at the measurement point. The terrain correction has been calculated using the Hammer Chart method [33,34]. The values of CBA data ranged from 11.068 -117.451mGal with the contour map as shown in Figure 6.…”

Section: Results Of Processing Datamentioning

confidence: 99%

Physical modeling of magma chamber of slamet volcano by means of satellite gravimetric data

Sehah

Prabowo

Raharjo

et al. 2022

CST

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Slamet Volcano (3,432 m) is the highest volcano in Central Java, Indonesia, with a weak explosive type of eruption compared to other active volcanoes. Designing the magma chamber model may help reveal the characteristics of Slamet Volcano. The modelling uses the gravimetric satellite data from GGMplus, which is best in spatial resolution compared to other satellite data, i.e. 220 m. Data processing begins with Bouguer correction and terrain correction and has resulted in complete Bouguer anomalies data, with values ranging from 11.068 – 117.451 mGal. Further, residual Bouguer anomalies data were obtained after data reduction to the horizontal surface and removal of regional anomalies data, to obtain values ranging from -67.569 – 38.808 mGal. The residual anomaly contour map shows the lowest anomalous value is under the volcanic cone at positions of 109.21967° E and 7.24281° S which is estimated to be the location of the magma chamber of Slamet Volcano. However, the inversion modeling resulting from the residual Bouguer anomalies data shows that the magma chamber of Slamet Volcano can be observed clearly at positions of 109.22053° E and 7.24719° S. The location of the magma chamber is not perfectly vertical under the volcanic cone but has a slight slope. The obtained model of the magma chamber has a relatively small volume and shallow depth, i.e. about 1 – 4 km. The obtained physical parameters of the magma chamber impact the characteristics of the eruption of Slamet Volcano which tend to be weak explosive.

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Section: Results Of Processing Datamentioning

confidence: 99%

Physical modeling of magma chamber of slamet volcano by means of satellite gravimetric data

Sehah

Prabowo

Raharjo

et al. 2022

CST

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Comparison of terrain corrections based on the point source and line source DC methods

Xie

Li²,

Li³

et al. 2022

Front. Earth Sci.

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In the direct current (DC) exploration method, topographic relief distorts the apparent resistivity curve. To eliminate effects of terrain fluctuations, two undulating terrains comprising valleys and ridges were investigated in the present study. An unstructured triangular mesh method in which the wave number k and its coefficient g were obtained using the integral method and the point and line source surveys were conducted using comsol multiphysics. Current sources were evaluated using two-dimensional (2-D) finite element forward modeling, whereas terrain correction was performed using both the comparison and conformal transformation methods. The results reveal comparable theoretical curves for the line and point sources, but quantitative characteristics of the curves differ. The comparison method is suitable for both curves, whereas the conformal transformation method is only applicable to the line source. Even though electric fields associated with the line and point sources differ, the comparison method that is based on the electrical cross-section curve of the line source and the electric profile curve of the point source remains effective.

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High accuracy gravity terrain correction by Optimally Selecting Sectors algorithm based on Hammer charts method

Cited by 2 publications

References 18 publications

Physical modeling of magma chamber of slamet volcano by means of satellite gravimetric data

Physical modeling of magma chamber of slamet volcano by means of satellite gravimetric data

Comparison of terrain corrections based on the point source and line source DC methods

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