A Note on the Use of the Second Vertical Derivative (SVD) of Gravity Data with Reference to Indonesian Cases

Grandis, Hendra; Sumintadireja, Prihadi

doi:10.5614/j.eng.technol.sci.2018.50.1.9

Cited by 18 publications

(17 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The SVD operator will return the curvature of the Bouguer anomaly, which means the changes in the dip direction of the anomaly. As seen in Figure 6d, the edge of the prism (red-dashed line) concurs with zero value between the maximum and minimum value of SVD (Sumintadireja et al, 2018).…”

Section: Comparing Gdo With Sa Hg and Svdsupporting

confidence: 64%

Application of Generalized Derivative Operator on Bouguer Anomaly for Detecting Geological Structures

Zaky

Bilqis²

2022

JGE

View full text Add to dashboard Cite

Generalized Derivative Operator (GDO) is one of the first-order derivative filters that could control the derivative’s direction by modifying the value of azimuth () and dip () parameters. This study aims to examine those GDO parameters on synthetic Bouguer anomaly and apply them to field data of the Silver Peak geothermal field to identify the geological structures. We use Python programs to conduct the GDO and other derivative operators such as horizontal gradient (HG), analytic signal amplitude (AS), as well Second Vertical Derivative (SVD) for comparison. The derivative operators are performed in the Fourier domain and spatial domain. The results from synthetic data show that GDO can amplify the response both on local and regional anomalies. Nevertheless, enhanced local and regional anomaly might be shown as the same maximum value of GDO. It appears that GDO disregard the influence of density contrast and depth variation of the anomalous body. Subsequently, anomaly enhancement of Silver Peak area shows that GDO anomaly concurred with geological map. GDO and SVD could amplify the response of geological structures such as intrusive granite, fault lineaments, and lithological contact, as well as the horst-graben structure, as mentioned in previous studies, that might be acting as fluid pathways for the Silver Peak geothermal system.

show abstract

Section: Comparing Gdo With Sa Hg and Svdsupporting

confidence: 64%

Application of Generalized Derivative Operator on Bouguer Anomaly for Detecting Geological Structures

Zaky

Bilqis²

2022

JGE

View full text Add to dashboard Cite

show abstract

“…The trend of this value can be seen from the second vertical derivative map produced in this study with a northwest-southeast orientation in Figure 9. Research by [24] shows that the second vertical derivative cannot determine the type of fault, either normal fault or reverse fault. The second vertical derivative can only identify the orientation of the slope and the change in the mass density of a fault plane [24].…”

Section: Derivative Analysis Resultsmentioning

confidence: 99%

Identification of Geological Structure Based on Gravity Method in Tangkuban Parahu Volcano, Bandung, Indonesia

Nurhasan

Rizqia²,

Hidayat³

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

View full text Add to dashboard Cite

Tangkuban Parahu Volcano, located in Cikahuripan, Lembang, West Bandung Regency, West Java, Indonesia, has a geothermal potential. However, this potential is accompanied by geohazard risks, one of which is a volcanic eruption that can interfere with the development of geothermal potential. On February 12, 2022, there was a gust of volcanic gas from Ratu Crater, indicating an increase in volcanic activity after an eruption in 2019. Based on the geological map of Tangkuban Parahu/Sunda Volcano Complex, it is estimated that there is a fault structure in a northwest-southeast direction, where if a volcanic eruption occurs, it will cause greater deformation because it cuts through Ratu Crater. Further studies with geophysical methods are needed to estimate the fault structure. The study of the subsurface geological structure of Tangkuban Parahu Volcano was carried out using the gravity method by studying variations in the gravitational field on the earth’s surface to determine differences in rock density. The Complete Bouguer Anomaly (CBA) value from the gravity method at Tangkuban Parahu Volcano shows 68 – 73 mGal, and residual anomaly values ranged from -0.95 to 0.67 mGal. The negative residual anomaly value between -0.95 to 0 mGal shows the weak zone due to volcanism in the crater. On the other hand, high residual anomaly values ranging from 0 to 0.67 mGal are interpreted as the influence of Lava 1 Tangkuban Parahu (Tl1). Analysis using First Horizontal Derivative (FHD) and Second Vertical Derivative (SVD) shows a fault structure trending Northwest – Southeast, which can be a way out of the accumulation of high-pressure water vapor due to volcanic activity.

show abstract

“…An SVD analysis of the residual Bouguer anomaly was performed to obtain the pattern of fault structures and lithological boundaries from the gravity data. An SVD value of zero (0) indicates a significant change in density in the form of faults, anomalous object boundaries, lithological boundaries, and basin boundaries (Sumintadireja et al, 2018). Figure 6 shows an SVD map of the residual Bouguer anomaly calculated using the Elkins filter (Elkins, 1951).…”

Section: Resultsmentioning

confidence: 99%

“…The SVD value of the Bouguer anomaly of zero (0) indicates a reasonably significant density change in the form of faults, anomalous object boundaries, lithological boundaries, and basin boundaries (Sumintadireja et al, 2018).…”

Section: Geology Rajabasamentioning

confidence: 99%

Geothermal Reservoir Identification based on Gravity Data Analysis in Rajabasa Area- Lampung

Sarkowi

Wibowo

2021

Ris.Geo.Tam

View full text Add to dashboard Cite

Gravity research in the Rajabasa geothermal prospect area was conducted to determine geothermalreservoirs and faults as reservoir boundaries. The research includes spectrum analysis and separation of the Bouguer anomaly to obtain a residual Bouguer anomaly, gradient analysis using the second vertical derivative (SVD) technique to identify fault structures or lithological contact, and 3D inversion modeling of the residual Bouguer anomaly to obtain a 3D density distribution subsurface model. Analysis was performed based on all results with supplementary data from geology, geochemistry, micro-earthquake (MEQ) epicenter distribution map, and magnetotelluric (MT) inversion profiles. The study found 3 (three) geothermal reservoirs in Mount Balirang, west of Mount Rajabasa, and south of Pangkul Hot Spring, with a depth of around 1,000-1,500 m from the ground level. Fault structures and lithologies separate the three reservoirs. The location of the reservoir in the Balirang mountain area corresponds to the model data from MEQ, temperature, and magnetotelluric resistivity data. The heat source of the geothermal system is under Mount Rajabasa, which is indicated by the presence of high-density values (might be frozen residual magma), high-temperature values, and the high number of micro-earthquakes epicenters below the peak of Mount Rajabasa.

show abstract

A Note on the Use of the Second Vertical Derivative (SVD) of Gravity Data with Reference to Indonesian Cases

Cited by 18 publications

References 13 publications

Application of Generalized Derivative Operator on Bouguer Anomaly for Detecting Geological Structures

Application of Generalized Derivative Operator on Bouguer Anomaly for Detecting Geological Structures

Identification of Geological Structure Based on Gravity Method in Tangkuban Parahu Volcano, Bandung, Indonesia

Geothermal Reservoir Identification based on Gravity Data Analysis in Rajabasa Area- Lampung

Contact Info

Product

Resources

About