The threat posed by volcanic eruptions necessitates ongoing monitoring to assess their status. Mount Semeru is one of the active volcanoes located on the island of Java. Observations are made using remote sensing, utilizing data from the Copernicus satellite Sentinel-1 Single Look Complex (SLC) to track changes in Differential Interferometric Synthetic Aperture Radar (DInSAR) deformation, and Sentinel-3 satellite sea and land surface temperature radiometer (SLTR) to observe ground surface temperature variations due to the eruption of Mount Semeru that occurred in 2022, before, during, and after the event. The DInSAR deformation recorded before the eruption ranged from -0.025 cm to -0.054 cm on the scale bar, while the land surface temperature (LST) before the eruption was at a minimum of 18.6 ℃ and a maximum of 27.8 ℃. during the eruption, DInSAR deformation changes showed inflation, with values reaching from 0.015 cm to 0.3 cm on the scale bar, and the LST also rose, peaking at 36.3 ℃. after the eruption, DInSAR deformation changes indicated deflation, with measurements between 0.049 cm and 0.099 cm on the scale bar, and the temperature trend also fell, with the highest temperature observed being 33.6 ℃.
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