Interpretation of gravity data to delineate underground structure in the Beppu geothermal field, central Kyushu, Japan

Nishijima, Jun; Naritomi, Kento

doi:10.1016/j.ejrh.2015.11.022

Cited by 31 publications

(18 citation statements)

References 13 publications

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“…The purpose of horizontal gradient and analytic signal is to detect, estimate and clarify the shape and the border of the geological structure of the study area. Geothermal fields in many sedimentary basins are distributed along fault structures [26]. The results from the horizontal gradient and analytic signal of Suli and Tulehu geothermal regions are shown in Figure 14.…”

Section: Gravity Gradient Tensor Analysis Of Suli and Tulehu Geothermmentioning

confidence: 99%

“…Gradient components Minimum (mGal/km) Maximum (mGal/km) study area. Geothermal fields in many sedimentary basins are distributed along fault structures [26]. The results from the horizontal gradient and analytic signal of Suli and Tulehu geothermal regions are shown in Figure 14.…”

Section: Gravity Gradient Tensor Analysis Of Suli and Tulehu Geothermmentioning

confidence: 99%

“…An upward continuation method was used to separate regional anomalies and local anomalies. Upward continuation is an operation to move data with a constant high level above the earth's surface (or measuring plane) and is used to estimate large-scale or regional trends (low frequencies or long wavelengths) of potential field data [26]. Some degree of upward continuation is the same as low-pass filtering because this process eliminates data with high frequency.…”

Section: Depth Estimation and Anomaly Separationmentioning

confidence: 99%

“…Bouguer anomaly is a combination of regional effects caused by deep structure and local effects by shallow structures [26]. This Bouguer anomaly needs to be separated according to the requirements of the study.…”

Section: Depth Estimation and Anomaly Separationmentioning

confidence: 99%

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The Study of Geological Structures in Suli and Tulehu Geothermal Regions (Ambon, Indonesia) Based on Gravity Gradient Tensor Data Simulation and Analytic Signal

et al. 2017

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Abstract:In early 2017, the geothermal system in the Suli and Tulehu areas of Ambon (Indonesia) was investigated using a gravity gradient tensor and analytic signal. The gravity gradient tensor and analytic signal were obtained through forward modeling based on a rectangular prism. It was applied to complete Bouguer anomaly data over the study area by using Fast Fourier Transform (FFT). The analysis was conducted to enhance the geological structure like faults as a pathway of geothermal fluid circulation that is not visible on the surface because it is covered by sediment. The complete Bouguer anomaly ranges of 93 mGal up to 105 mGal decrease from the southwest in Suli to the northeast in Tulehu. A high gravity anomaly indicates a strong magmatic intrusion below the Suli region. The gravity anomalies decrease occurs in the Eriwakang mountain and most of Tulehu, and it is associated with a coral limestone. The lower gravity anomalies are located in the north to the northeast part of Tulehu are associated with alluvium. The residual anomaly shows that the drill well TLU-01 and geothermal manifestations along with the Banda, and Banda-Hatuasa faults are associated with lowest gravity anomaly (negative zone). The gravity gradient tensor simulation and an analytic signal of Suli and Tulehu give more detailed information about the geological features. The g zz component allows accurate description of the shape structures, especially the Banda fault associated with a zero value. This result will be useful as a geophysical constraint to subsurface modeling according to gravity gradient inversion over the area.

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Section: Gravity Gradient Tensor Analysis Of Suli and Tulehu Geothermmentioning

confidence: 99%

Section: Gravity Gradient Tensor Analysis Of Suli and Tulehu Geothermmentioning

confidence: 99%

Section: Depth Estimation and Anomaly Separationmentioning

confidence: 99%

Section: Depth Estimation and Anomaly Separationmentioning

confidence: 99%

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The Study of Geological Structures in Suli and Tulehu Geothermal Regions (Ambon, Indonesia) Based on Gravity Gradient Tensor Data Simulation and Analytic Signal

et al. 2017

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“…Garan [2][3][4][5]. Beppu city is recognized historically as one of the largest spa resort areas on Kyushu Island, famous mostly for its onsen (hot spring bathing) and fumaroles [3,6]. The Beppu geothermal system is bounded by two striking faults at the north and south borders, almost along the east-west direction, and forms an alluvial fan in the center, made up by debris avalanches of andesite or dacite between the faults from the volcanoes behind [2,5].…”

Section: Introductionmentioning

confidence: 99%

Monitoring Thermal Activity of the Beppu Geothermal Area in Japan Using Multisource Satellite Thermal Infrared Data

2018

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The Beppu geothermal area, one of the largest spa resorts on the northeast Kyushu Island of Japan, is fed by hydrothermal fluids beneath the volcanic center of Mt. Garan and Mt. Tsurumi in the west. We explored the thermal status of the Beppu geothermal area using nighttime multisource satellite thermal infrared data (TIR) from the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) and Landsat 8 thermal infrared scanner (TIRS) to monitor heat loss from 2009 to 2017. We also assessed heat loss from Mt. Garan fumaroles to investigate a relationship between them. The normalized differential vegetation index (NDVI) threshold method of spectral emissivity, the split-window algorithm for land surface temperature (LST), and the Stefan–Boltzmann equation for radiative heat flux (RHF) were used to estimate heat loss in this study. Total heat loss increased by about a 35% trend overall from 2009 to 2015 and then declined about 33–42% in 2017 in both the Beppu geothermal area and Mt. Garan fumaroles overall. The higher thermal anomalies were found in 2015 mostly in the southeastern coastal area of the Beppu geothermal region. The highest thermal anomaly was obtained in 2011 and the lowest in 2017 within the Mt. Garan fumaroles. The areas with a higher range of RHF values were recorded in 2015 in both study areas. Finally, the results show similar patterns of heat loss and thermal anomalies in both the Beppu geothermal area and Mt. Garan fumaroles, indicating a closely connected geothermal system overall. This suggests that nighttime TIR data are effective for monitoring the thermal status of the Beppu geothermal area.

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Basement faults deduction at a dumpsite using advanced analysis of gravity and magnetic anomalies

Alatorre-Zamora

Campos-Enríquez

Fregoso

et al. 2020

Near Surface Geophysics

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A study of the fracture systems in the basement of the Matatlan urban waste dump of Guadalajara City, near the western edge of the Rio Grande de Santiago canyon (southwestern Mexico), is reported. The Matatlan dumpsite was developed on top of andesitic and rhyolitic rocks. Measurements at outcrops indicated that N–S (0°–15° and 165°–180°), N45–90E and N105–135E fracture systems affect the basement. Statistical analysis (micromagnetic method) of magnetic lineament azimuths indicated the presence of two lineament groups. The major one (N60–120E) has a maximum at N90–105E, and a secondary group (N120–165E). The gravity anomalies are featured by a major group (N60–120E, with maximums at N60–75E, and N105–120E) and a secondary group (N120–180E). Thus, a good to fair correlation exists between the measured fracture orientations and the lineaments featuring the gravity and magnetic anomalies. Horizontal derivative and tilt angle depicted horizontal limits of anomaly‐causative bodies. Results of the micromagnetic method are consistent with fracture orientations and with the limits established through edge‐detection techniques. Lineaments established by means of the gravity and magnetic Euler deconvolution are also consistent. Gravity and magnetic Euler deconvolution helped to estimate the depth extent of the limits of gravity and magnetic common sources. Euler deconvolution indicated the fault or contact nature of these lineaments. Furthermore, Euler deconvolution indicated slopes of the limits of gravity and magnetic sources. The fault or fracture nature of the major lineaments was finally confirmed by forward modelling (forward 2D cooperative modelling of gravity and magnetic profiles). For example, lineaments delimiting the northern depression could be characterized as normal faults. In general, this study indicates that it is possible, based on gravity and magnetic data, to characterize fractures affecting the basement of a dumpsite, a key parameter in hydrogeophysical studies. In particular, through this study, the inferred structures could be associated with regional tectonic faulting, which might provide migration paths to unhealthy lixiviate outside the dumpsite, giving rise to the contamination of the neighbouring environment. In particular, the study explains the presence of an unhealthy leachate waterfall to the northeast of the dumping site. Heavy metal contents in samples from this waterfall support that lixiviates originate at the dumpsite.

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Interpretation of gravity data to delineate underground structure in the Beppu geothermal field, central Kyushu, Japan

Cited by 31 publications

References 13 publications

The Study of Geological Structures in Suli and Tulehu Geothermal Regions (Ambon, Indonesia) Based on Gravity Gradient Tensor Data Simulation and Analytic Signal

The Study of Geological Structures in Suli and Tulehu Geothermal Regions (Ambon, Indonesia) Based on Gravity Gradient Tensor Data Simulation and Analytic Signal

Monitoring Thermal Activity of the Beppu Geothermal Area in Japan Using Multisource Satellite Thermal Infrared Data

Basement faults deduction at a dumpsite using advanced analysis of gravity and magnetic anomalies

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