Exploration of hydrothermal alteration and monitoring of thermal activity using multi-source satellite images: A case study of the recently active Kirishima volcano complex on Kyushu Island, Japan

•Most active thermal area is identified using alteration and thermal anomaly.•Maximum LST values declined from first to third eruption period.•Highest RHF and peak of RHL reduced during the study period.•Shinmoedake crater was more intense thermal activity than Ohnamiike crater.•The intensity of unr...

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