A new inversion method of estimation of simultaneous near surface bulk density variations and terrain correction across the Bandar Charak (Hormozgan-Iran)

Toushmalani, Reza; Rahmati, Azizallah

doi:10.1186/2193-1801-3-135

Cited by 6 publications

(3 citation statements)

References 8 publications

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“…After the acquisition, relative gravity value at each stations were obtained [4]. Relative gravity data were then processed with several corrections such as drift, latitude, free air, bouger and terrain corrections.…”

Section: Gravity Methodsmentioning

confidence: 99%

An Updated Study of Discovering Blawan-Ijen Geothermal Prospect Area Using Gravity and Magnetic Methods

et al. 2018

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The Blawan-Ijen volcanic complex is located in Bondowoso regencies, East Java province. The complex is expected to have geothermal system which is indicated by the occurrence of Blawan hotspring, acid lake on Ijen Crater and alterations. In 2017, measurements of gravity and magnetic methods have been conducted for the first time through the PITTA 2017 program. In 2018, further measurements are carried out to infill the previous data in order to strengthen the interpretation results. There are 151 stations obtained from each method until 2018. In this study, gravity method is used to detect the contrast density of an anomalous body while magnetic method is applied to discover the location of demagnetization zone. This paper presents the integration of both methods in geothermal exploration to determine the geothermal prospect area. The result of CBA and residual gravity indicated the existence of high gravity anomaly in the center to the southwest of the study area. Moreover, after processing RTP on magnetic data, there is the presence of low magnetic anomaly usually associated with demagnetization zone. Generally, the overall results supported one each other and pointed out the occurrence of the geothermal prospect possibly around the center of the study area.

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Section: Gravity Methodsmentioning

confidence: 99%

An Updated Study of Discovering Blawan-Ijen Geothermal Prospect Area Using Gravity and Magnetic Methods

et al. 2018

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“…The Parasnis approach measures the correlation between free-air gravity (without Bouguer correction) and topography. This approach assumes that the topographic relief and density are homogeneous so that the free-air anomaly can be expressed as a straightline equation "y = mx + c" and the density value is expressed by the slope component of the line (gradient) (Toushmalani & Rahmati 2014). The application of the Parasnis method is shown by the graph of Δgobs + 3.080h against (−0.0004191h + T) and and a density value of 2.27 gr/cc is given.…”

Section: Estimation Of Densitymentioning

confidence: 99%

Untitled

2023

JSM

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Mud volcanoes, known as mud extrusion phenomenon, is a geological feature that expels suspended fine-grained sedimentary materials and fluids to the surface due to buoyancy and pressure difference. This geological feature is found almost all over the world and formed in compressional tectonic environments, one of which is the Ciuyah Mud Volcano, Kuningan, Indonesia. Previous studies have shown that the appearance of the mud volcano was influenced by tectonic activity that formed a 'hypothetical' fault structure as a pathway for mud migration and extrusion to the surface. Integration of geophysical studies using satellite gravity and geology using fault fracture density analysis was conducted to prove the existence of the 'hypothetical' fault structure. The results show that the mud volcano site is located in a low to high gravity anomaly pattern associated with significant density contrast differentiation followed by the maximum value of FHD and low-high SVD pattern oriented west southwest -east northeast (WSW -ENE). The gravity anomaly pattern can be associated with the presence of faults. This is reinforced by the fault fracture density map which shows that the mud volcano site is located in a medium to high fracture density zone (weak zone) associated with good permeability conditions below the surface. Thus, the research results have proven the existence of a 'hypothetical' fault as the migration and extrusion pathway of Ciuyah Mud Volcano mud that has been studied previously.

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“…least squares model parameter estimation. Its accuracy, however, strongly depends on how efficiently the regional trends and very local (terrain) effects are removed from the gravity anomalies processed [6].…”

Section: Nettleton Methodsmentioning

confidence: 99%

Bouguer Density Analysis using Nettleton Method at Banten NPP Site

Yuliastuti

Suntoko²,

Susilo³

2017

Jurnal Pengembangan Energi Nuklir

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BOUGUER DENSITY ANALYSIS USING NETTLETON METHOD AT BANTEN NPP SITE.Sub-surface information become crucial in determining a feasible NPP site that safe from external hazards. Gravity survey which result as density information, is essential to understand the sub-surface structure. Nevertheless, overcorrected or under corrected will lead to a false interpretation. Therefore, density correction in term of near-surface average density or Bouguer density is necessary to be calculated. The objective of this paper is to estimate and analyze Bouguer density using Nettleton method at Banten NPP Site. Methodology used in this paper is Nettleton method that applied in three different slices (A-B, A-C and A-D) with density assumption range between 1700 and 3300 kg/m 3 . Nettleton method is based on minimum correlation between gravity anomaly and topography to determine density correction. The result shows that slice A-B which covers rough topography difference, Nettleton method failed. While using the other two slices, Nettleton method yield with a different density value, 2700 kg/m 3 for A-C and 2300 kg/m 3 for A-D. A-C provides the lowest correlation value which represents the Upper Banten tuff and Gede Mt. volcanic rocks in accordance with Quartenary rocks exist in the studied area. ABSTRAK ANALISIS DENSITAS BOUGUER MENGGUNAKAN METODE NETTLETON DI TAPAK PLTN BANTEN.Informasi bawah permukaan menjadi krusial dalam menentukan kelayakan tapak PLTN yang aman dari bahaya eksternal. Survey gravitasi yang menghasilkan informasi densitas, penting untuk memahami struktur bawah permukaan. Namun demikian, informasi densitas yang terkoreksi lebih atau kurang akan menyebabkan kesalahan interpretasi. Untuk itu, koreksi densitas dalam bentuk densitas rata-rata dekat permukaan atau densitas Bouguer, penting untuk dilakukan perhitungan. Tujuan penelitian adalah melakukan estimasi dan menganalisis densitas Bouguer menggunakan metode Nettleton di tapak PLTN Banten. Metodologi yang digunakan adalah metode Nettleton yang diaplikasikan pada tiga posisi pemotongan (A-B, A-C dan A-D) dengan asumsi densitas 1700 -3300 kg/m 3 . Metode Nettleton didasarkan pada nilai korelasi minimum antara anomali gravitasi dan topografi dalam menentukan koreksi densitas Bouguer. Hasil menunjukkan bahwa metode Nettleton gagal pada A-B yang meliputi area topografi yang sangat beragam. Sedangkan pada dua posisi yang lain, metode Nettleton memberikan nilai densitas yang berbeda yaitu, 2700 kg/m 3 untuk A-C dan 2300 kg/m 3 untuk A-D. A-C memberikan nilai korelasi terendah yang merepresentasikan tufa Banten atas dan batuan vulkanik gunung Gede sesuai dengan distribusi batuan Kuarter yang ada di daerah studi. Kata Kunci: densitas Bouguer, anomali gravitasi, metode Nettleton ARTICLE INFORMATION

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A new inversion method of estimation of simultaneous near surface bulk density variations and terrain correction across the Bandar Charak (Hormozgan-Iran)

Cited by 6 publications

References 8 publications

An Updated Study of Discovering Blawan-Ijen Geothermal Prospect Area Using Gravity and Magnetic Methods

An Updated Study of Discovering Blawan-Ijen Geothermal Prospect Area Using Gravity and Magnetic Methods

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Bouguer Density Analysis using Nettleton Method at Banten NPP Site

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