"Mount Anak Krakatau has experienced continuous tremor activities during the past three days. The visual observations above the volcano were obstructed by fog, but there is no eruption," head of Mt Anak Krakatau Observatory Post Andi Suardi said here on Monday.
According to Andi, with its unpredictable activity, the volcano in Sunda Straits remains in its alert status and the authority has warned tourists and fishermen to stay away from the volcano.
Previously, the Meteorology, Climatology and Geophysics Agency (BMKG) reported that Mt Anak Krakatau during Thursday to Friday (Sept 6-7) experienced constant tremors, and it detected firelights and thunder sounds.
Mt Anak Krakatau has an altitude of 305 meter above sea level. The tremor has indicated volcanic activity and used as a key parameter before the eruption.
Reporting by Hisar Sitanggang
Editing by Sri Haryati