Second Vertical Derivative Using 3-D Gravity Data for Fault Structure Interpretation

Wahyudi, Eko Januari; Kynantoro, Y; Alawiyah, Susanti

doi:10.1088/1742-6596/877/1/012039

Cited by 12 publications

(9 citation statements)

References 4 publications

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“…The second vertical derivative is an analytical method used principally for the separation of residuals from regional patterns (Telford et al, 1990). Commonly known as the SVD method, this kind of data processing is also immensely useful for the identification of faults and shallower geologic features as double differentiation concerning depth tends to emphasize the smaller, shallower geologic anomalies at the expense of larger regional features (Aku, 2014; Hinze et al, 2013; Reynolds, 2011; Wahyudi et al, 2017).…”

Section: Methods and Approachmentioning

confidence: 99%

Morphotectonic forcing and anthropogenic impact behind a recently emerged relict island of the Brahmaputra River

Gogoi

Chetia

Borgohain

et al. 2022

Earth Surf Processes Landf

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Large rivers can be significantly impacted upon by both tectonics and human activities; yet, there are very few studies where these natural and anthropogenic impacts combine. A new river island called Dibru-Saikhoa has appeared very recently on the Brahmaputra valley map in Assam. More than 200 km 2 in area, it is situated in the extreme upstream reach of the Brahmaputra River and represents the second biggest relict island after Majuli (with a present area of $500 km 2 ). The cause of the formation of this island is generally attributed to river dynamics, with only a minor anthropogenic role. However, our study, considering morphological changes from 1915 to 2019 and subsurface geophysical data, suggests that the anthropogenic factor was an important 'trigger' of island formation, acting on a system made sensitive to change by the combination of local tectonics and rapidly changing sediment influx.Making use of the satellite-borne Bouguer gravity data and ground survey-based seismic sections, we located some of the prominent blind faults. Taking into consideration recent activation and interplay of these faults, the mode of accommodation space generation, and aggradation characteristics due to fluvial processes, we suggest a multi-order mechanism of formation of this relict island. The first-order trigger is due to the unstable river morphology of the Siang, which is responding to tilting of the valley floor as a co-seismic phenomenon, and subsequently influences two other rivers-the Dibang and the Lohit. Second-order forcing comes from intra-plate residual pop-up that comes into play due to uneven sediment loading. The third-order forcing is inter-plate suturing, which causes arching and fracturing of the basement.

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Section: Methods and Approachmentioning

confidence: 99%

Morphotectonic forcing and anthropogenic impact behind a recently emerged relict island of the Brahmaputra River

Gogoi

Chetia

Borgohain

et al. 2022

Earth Surf Processes Landf

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“…These methods draw several concentric circles with different radii to the center of the point on which the calculation is performed. In this case, the value of the second derivative of the following relation is specified [36]:…”

Section: Methodsmentioning

confidence: 99%

Geophysical Study: Estimation of Deposit Depth Using Gravimetric Data and Euler Method (Jalalabad Iron Mine, Kerman Province of IRAN)

Shirazy¹,

Ширази²,

Nazerian³

et al. 2021

OJG

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Mineral exploration is done by different methods. Geophysical and geochemical studies are two powerful tools in this field. In integrated studies, the results of each study are used to determine the location of the drilling boreholes. The purpose of this study is to use field geophysics to calculate the depth of mineral reserve. The study area is located 38 km from Zarand city called Jalalabad iron mine. In this study, gravimetric data were measured and mineral depth was calculated using the Euler method. 1314 readings have been performed in this area. The rocks of the region include volcanic and sedimentary. The source of the mineralization in the area is hydrothermal processes. After gravity measuring in the region, the data were corrected, then various methods such as anomalous map remaining in levels one and two, upward expansion, first and second-degree vertical derivatives, analytical method, and analytical signal were drawn, and finally, the depth of the deposit was estimated by Euler method. As a result, the depth of the mineral deposit was calculated to be between 20 and 30 meters on average.

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“…In Figure 9b this filter is applied to our data, showing some imaged potential fault-lines following zero contours on the map, where horizontal gradients are highest. Being a second order filter, 2VDr enhances near surface effects at the expenses of deeper anomalies, it amplifies noise and may produce artificial second derivative anomalies (Wahyudi et al, 2017).…”

Section: Data Filtering: Operations With Directional Gradientsmentioning

confidence: 99%

Geophysics for geothermal exploration. Directional-derivatives-based computational filters applied to geomagnetic data at lake Cuitzeo, Mexico

Mazzoldi

Garduño‐Monroy

Cortes

et al. 2020

GeofInt

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Para el desarrollo de un campo geotérmico, el conocimiento de la distribución de fracturas, la hidrología y la evolución tectónica del sitio a través de la caracterización estructural del sistema natural es un requisito previo a la perforación de pozos exploratorios. Fallas y fracturas representan vías preferenciales por el flujo de fluidos en el subsuelo y pueden ser detectadas mediante investigaciones geológicas en la superficie y geofísicas en el subsuelo. Una anomalía magnética positiva y de forma sub-circular en planta se encuentra en el medio del lago Cuitzeo, México. A través de un levantamiento geomagnético dentro y alrededor del área que comprende la anomalía tratamos caracterizar el reservorio geotérmico que, al sur del lago, está notificado por manifestaciones hidrotermales. Utilizando filtros computacionales basados sobre el uso de operaciones con las derivadas de valores de campo a los datos magnéticos grabados, hemos puesto en luz algunas de las estructuras que influencian la circulación de los fluidos en el sistema geotermal. Nuestra atención se focalizó sobre fallas ~N-S and E-W, pertenecientes respectivamente a la tectónica Básin & Range (B&R) y a la del Cinturón Volcánico Mexicano (CVM). Según nuestra interpretación, la interacción de dos o mas estructuras de diferentes orígenes (B&R y CVM), además del entorno geodinámico específico (subducción de zona de fracturas), facilitó el surgimiento de cuerpos magmáticos básicos del profundo que, bloqueados por la capa argilosa de sedimentación lacustre del Cuitzeo, dieron lugar, enfriándose lentamente, al sistema geotermal y contribuyeron a la formación de la anomalía magnética.

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Second Vertical Derivative Using 3-D Gravity Data for Fault Structure Interpretation

Cited by 12 publications

References 4 publications

Morphotectonic forcing and anthropogenic impact behind a recently emerged relict island of the Brahmaputra River

Morphotectonic forcing and anthropogenic impact behind a recently emerged relict island of the Brahmaputra River

Geophysical Study: Estimation of Deposit Depth Using Gravimetric Data and Euler Method (Jalalabad Iron Mine, Kerman Province of IRAN)

Geophysics for geothermal exploration. Directional-derivatives-based computational filters applied to geomagnetic data at lake Cuitzeo, Mexico

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