Analysis of gravity anomaly and seismicity in Bali region

Tobing, Alfha Abrianto L.; Sukarasa, I Ketut; Yusuf, Mahmud

doi:10.53730/ijpse.v5n3.1723

Cited by 3 publications

(3 citation statements)

References 12 publications

(12 reference statements)

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“…The cross-section is used to see the condition of the surface contours in the area where the cross-section line passes. The image also shows a complete Bouguer anomaly 3D contour, and the regional and residual anomaly will be separated using the moving average filter [16].…”

Section: Results 31 Simple Bouguer Anomaly (Sba) and Complete Bouguer...mentioning

confidence: 99%

Gravity Anomaly Evaluation of the Geothermal Field Distribution Around the Seismo-Volcanic Area of Toba Lake

Rizki

Lubis

Handayani³

et al. 2022

J. Phys.: Conf. Ser.

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Toba Lake is one of the largest caldera lakes in the world, formed by an enormous eruption about 74,000 years ago. The emergence of hot spring manifestations around Lake Toba is closely related to volcanic activity, which is also controlled by regional geological structures. There are two areas in Lake Toba: Simbolon and Pusuk Buhit, with several geothermal manifestations, such as fumaroles, hot springs, and steaming ground. With the large caldera area, there should be other locations with geothermal potential. Therefore, we analyzed the regional gravity anomaly to find specific patterns that might indicate a possible geothermal field. First, we obtained the data of Free Air Anomaly (FAA) with a resolution of 1.85 km from altimetry satellites and acceleration of gravity anomaly data of 0.1 mGal at 1 minute per grid with an altitude accuracy of 1 meter. In order to acquire the Simple Bouguer Anomaly, the data were corrected. Then, we analyzed the results based on derivative analysis. The result shows that the location has simple Bouguer anomaly values between - 26.2 mGal-36.0 mGal with an initial density of 1.74 gr/cc. Furthermore, we speculated that indicated regional patterns of structures and sub-surface properties might be associated with that prospective geothermal.

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Section: Results 31 Simple Bouguer Anomaly (Sba) and Complete Bouguer...mentioning

confidence: 99%

Gravity Anomaly Evaluation of the Geothermal Field Distribution Around the Seismo-Volcanic Area of Toba Lake

Rizki

Lubis

Handayani³

et al. 2022

J. Phys.: Conf. Ser.

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“…Furthermore, the data is carried out Bouguer correction, free air correction, field correction to obtain complete Bouguer anomaly data. The complete Bouguer anomaly data is grid which will then be analyzed for spectrum to determine the estimated depth of the research area using Oasis Montaj software (Abrianto et al, 2021). After performing spectrum analysis, the regional and residual anomalies will then be separated using the Bandpass filter in Oasis Montaj software.…”

Section: Methodsmentioning

confidence: 99%

Identification of the Ancient Lakes Based on Gravity Methods in Borobudur Temple

Permana¹,

Rahman²,

Zani

et al. 2023

JGE

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Indonesia is a country that's well known for its heritages. One of the heritages is Borobudur Temple. Several studies say that the Borobudur was enclosed by a lake. Therefore, this study aims to see the remains of an ancient lake below the surface with gravity method. The process stage begins with obtaining the CBA (Complete Bouger Anomaly) and continues by separating the anomaly with a Bandpass Filter, and followed with 3D inverse modeling and FHD (First Horizontal Derivative) analysis. According to the residual map, there are only minor anomalies in the west, south, and east, ranging in magnitude from -0.539 to (-0.209) mGal. This anomaly is consistent with the location of the ancient lake around Borobudur. In the meantime, the 3D modeling of the FHD study reveals a geologic structure surrounding the Borobudur with an anomaly ranging from 0.00289 to 0.00480 mGal. A deposit layer thought to be an ancient lake is visible between 50 and 525 meters in depth over the east and west sides of the Borobudur temple, and beneath it is visible between 250 and 525 meters. This depth map provides additional evidence that the ancient lake beneath the Borobudur is located between 250 and 525 meters.

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“…Our observations align with the fact that earthquakes in the JF and its surrounding area are located primarily within density difference zones resulting from lateral density in homogeneity. Tobing et al (2021) analyzed the relationship between gravity anomalies and seismic activity and concluded that regions with higher rock densities exhibited higher levels of seismic activity. Examining the density characteristics of the physical properties in the study area (Table 1), the density characteristics in the study show that the JF hanging wall consists of Neoproterozoic gneissic granodiorite with a relatively high density of 2.650 g/cm 3 .…”

Section: Relationship Between Deep Density Structure and Earthquakesmentioning

confidence: 99%

Three‐Dimensional Density Distribution and Seismic Activity along the Guxiang–Tongmai Segment of the Jiali Fault, Tibet

FAN,

YU,

WANG

et al. 2024

Acta Geologica Sinica (Eng)

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The Guxiang‐Tongmai segment of the Jiali fault is situated northeast of the Namche Barwa Syntaxis. It is one of the most active strike‐slip faults near the Namche Barwa Syntaxis and plays a pivotal role in the examination of seismic activity within the eastern Himalayan Syntaxis. In this dissertation, we meticulously processed the data acquired in the research region, yielding a 1:200,000 gravity dataset covering an area 1500 km2. Using wavelet transform multiscale decomposition, scratch analysis techniques, and 3D gravity inversion methods, we determined gravity anomalies, fault distributions, and density structures across various scales. Through the integration of our new gravity data with other geophysical and geological information, our findings demonstrate substantial variations in the overall crustal density within the region, with the fault distribution closely linked to these density fluctuations. Disparities in stratigraphic density are importment causes of variations in the capacity of geological formations to endure regional tectonic stress. Earthquakes are predominantly concentrated within the density transition zone and are primarily situated in regions of elevated density. The hanging wall stress within the Guxiang‐Tongmai segment of the Jiali fault exhibits a notable concentration, marked by pronounced anisotropy, and is positioned within the density differential zone, which is prone to earthquakes.

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Analysis of gravity anomaly and seismicity in Bali region

Cited by 3 publications

References 12 publications

Gravity Anomaly Evaluation of the Geothermal Field Distribution Around the Seismo-Volcanic Area of Toba Lake

Gravity Anomaly Evaluation of the Geothermal Field Distribution Around the Seismo-Volcanic Area of Toba Lake

Identification of the Ancient Lakes Based on Gravity Methods in Borobudur Temple

Three‐Dimensional Density Distribution and Seismic Activity along the Guxiang–Tongmai Segment of the Jiali Fault, Tibet

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