Integration of Thermal Infrared and Synthetic Aperture Radar Images to Identify Geothermal Steam Spots Under Thick Vegetation Cover

Saepuloh, Asep; Saputro, Rezky Heidi; Heriawan, Mohamad Nur; Malik, Dwiyogarani

doi:10.1007/s11053-020-09754-9

Cited by 9 publications

(4 citation statements)

References 39 publications

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“…Another possibility is that the intersection of two faults causes an intensive weak zone and when filled with fluid may decrease rock resistivity values. A similar result was conveyed earlier in the Wayang-Windu area based on an analysis of SAR satellite imagery [44]. The intersection area of two fault directions shows a low rock strength index value, which is interpreted as an intensive weak zone.…”

Section: Discussionsupporting

confidence: 83%

Magnetotellurics (MT) and Gravity Study of a Possible Active Fault in Southern Garut, West Java, Indonesia

Arisbaya

Wijanarko

Warsa

et al. 2023

International Journal of Geophysics

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In recent years, dozen low-intensity earthquakes occurred in southern Garut, West Java Indonesia; two of them were reported destructive. However, those shallow earthquake clusters are hardly associated with well-known active faults in the area. Hence, we conducted 3D gravity combined with 2D magnetotellurics (MT) inversions to study the subsurface. Gravity and MT modeling confirm a basin with around 5 km depth consisting of two subbasins separated by a NE-SW trending local-high ridge. The local high coincides with the magmatic intrusion in geothermal fields and aligns with a series of volcanic bodies’ lineament observed on the surface. We interpret this structural high as a preexisting fault that serves as a magma pathway in the tectonomagmatic interaction. Shallow low-magnitude seismicity in the southern Garut area tends to occur in the resistive bodies. We interpret that heat from the cooling magmatic intrusion may decrease the effective fault-normal stress of the rocks, leading to a decrease in fault failure resistance and may initiate rupture. The resistivity structure around the initial rupture may affect whether or not the nucleation will end up as a large-magnitude earthquake. Furthermore, the unconsolidated young volcanic cover in this area could amplify ground shaking when earthquake occurs that might lead to more extensive damage.

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Section: Discussionsupporting

confidence: 83%

Magnetotellurics (MT) and Gravity Study of a Possible Active Fault in Southern Garut, West Java, Indonesia

Arisbaya

Wijanarko

Warsa

et al. 2023

International Journal of Geophysics

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“…The radiation emitted from the surface in the range of thermal infrared wavelength represents their kinetic temperature and emissivity (Saepuloh et al, 2020) related to physical properties of the surface. In this study, the emissivity normalization technique has been used to calculate the temperature for every pixel by taking an assumption that surface emissivity is homogeneous.…”

Section: Agung Volcanomentioning

confidence: 99%

Characterizing SO2 Emission Rate, Thermal Anomalies, from Opened and Closed Vent System at Agung, Bromo, and Sinabung Volcanoes in Indonesia

Alfianti,

Saepuloh,

Surmayadi

et al. 2023

Indonesian J. Geosci.

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Agung, Bromo, and Sinabung Volcanoes have high volcanic activity over the last decade, and have different eruption characteristics. Hence, it would be fascinating to study the characteristics of their volcanic activity patterns based on SO2 emission rates and thermal anomaly correlated with the seismicity data. The SO2 emission rate measurement was carried out using the Differential Optical Absorption Spectroscopy (DOAS), and calculated based on SO 2 column density, distance of measurement, wind speed, and wind direction. In addition, SO2 emission was detected using Ozone Monitoring Instrument (OMI) images with daily global coverage. Thermal anomaly detection was performed using Advance Spaceborne Thermal Emission and Reflection Radiometer (ASTER) of Thermal Infrared (TIR) subsystem with high spatial resolution (90x90 m). ASTER TIR images were corrected for radiometric and thermal atmospheric. The emissivity and brightness temperature separation algorithm was applied to obtain surface temperature of Agung, Bromo, and Sinabung Volcanoes. All the data were correlated with the seismicity of each volcano. The SO2 emission rates correlate with the magma ascent to the shallow depth in an open system volcano (Bromo Volcano). In the closed-system volcanoes (early phase of Agung and Sinabung), SO2 emission was detected after the transition of closed to open system. Magmatic injection from the reservoir to the shallow depth was detected as thermal anomalies, such as in Agung Volcano. Whereas in Bromo Volcano, the thermal anomaly was insignificant since Bromo Volcano has an explosive eruption at a short period, so the ASTER image could not observe the thermal anomaly on the eruption time. Thermal anomaly pattern in Sinabung Volcano was the manifestation of new magmatic injection to the shallow depth. Therefore, their increase serves as indicators for the increasing magmatic activity prior to the eruptions. Keywords: SO2 emission rate, thermal anomaly, DOAS, OMI, ASTER, Open Vent, Closed Vent

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“…The satellite orbital time is 16 days for re-measurement at the same location. ASTER can also measure emission in the Short-Wave Infrared spectrum (SWIR, 1.6 to 2.43 µm), but the SWIR sensor is no longer functional as of April 2008 (Saepuloh et al, 2020). Specifically, Fig.…”

Section: Ndvimentioning

confidence: 99%

“…The geothermal exposure of the volcano can be seen from a crater close to the barren peak. volcanic area, Indonesia (Saepuloh et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Exploring the geothermal potential of Peut Sagoe volcano using Landsat 8 OLI/TIRS images

et al. 2022

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Integration of Thermal Infrared and Synthetic Aperture Radar Images to Identify Geothermal Steam Spots Under Thick Vegetation Cover

Cited by 9 publications

References 39 publications

Magnetotellurics (MT) and Gravity Study of a Possible Active Fault in Southern Garut, West Java, Indonesia

Magnetotellurics (MT) and Gravity Study of a Possible Active Fault in Southern Garut, West Java, Indonesia

Characterizing SO2 Emission Rate, Thermal Anomalies, from Opened and Closed Vent System at Agung, Bromo, and Sinabung Volcanoes in Indonesia

Exploring the geothermal potential of Peut Sagoe volcano using Landsat 8 OLI/TIRS images

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