Deformation Monitoring of Lava Dome Growth derived by Sentinel-1A images at Mt. Ibu, North Maluku, Indonesia

Nur Ayu Anas; Asep Saepuloh

Nur Ayu Anas Geological Engineering, Faculty of Earth Sciences and Technology, Bandung Institute of Technology, Jl. Ganesha No. 10, bandung, Indonesia
Asep Saepuloh Geological Engineering, Faculty of Earth Sciences and Technology, Bandung Institute of Technology, Jl. Ganesha No. 10, Bandung, Indonesia

Keywords: Deformation, PLT D-InSAR, K-Means clustering

Abstract

Understanding the growth of lava domes in volcanoes is one of the most important tasks in volcanology because of the high threat to human life and infrastructure. One of the volcanoes with high lava dome growth is Mt. Ibu in North Maluku Province, Indonesia. Monitoring the growth of the lava dome on Mt. Ibu relied on the visual camera at the observation post. Therefore, the growth of the dome could only be observed from a few vantage points. To resolve this problem, the Sentinel-1A images have been used to monitor the area and volume lava dome regardless of cloud cover or ash plume from the eruption of Mt. Ibu. The current condition of the lava dome has expanded through the outer crater rim in the northern flank, which is about 5 km from urban areas. We used the pair-wise logic technique differential interferometric synthetic aperture radar (PLT D-InSAR) method to monitor the deformation of the lava dome growth from January 2020 to September 2022. The PLT D-InSAR deformation results show that the highest uplift and subsidence occurred in January 2022 about 0.667 m and in August 2020 about -0.48 m, respectively. The k-means clustering, median, and open filtering methods were also used to enhance the contrast of the deformation areas.

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