More recently, severe flooding has affected parts of Central Java Province. BNPB reported that 12,065 houses were submerged and 191 people were displaced by flooding in Pekalongan City, Central Java, on 19 January 2021. Over 60,000 people are thought to have been affected. As of 21 January, flooding was slowly receding, BNPB said. Flood ListRSOE Alertmap showing current disasters in Indonesia
Last week Mount Semeru, the highest volcano on Indonesia's most densely populated island of Java, spewed hot clouds as far away as 4.5 kilometres (nearly 3 miles) on Saturday. There were no immediate evacuations, but the National Disaster Mitigation Agency warned people who live in the villages on the slopes of the 3,676-meter (12,060-foot)-high mountain to be vigilant in looking for signs of danger. Agency spokesperson Raditya Jati said that people around the river basin on the slopes of the mountain should beware of high rainfall intensity that can trigger lava floods.
Indonesia's Volcanology and Geological Hazard Mitigation Center did not raise Semeru's alert status, which already had been at the third-highest level since it began erupting in May. The volcano spewed hot ash for 3,000 metres (9,800 feet) in early December, triggering panic among villagers. Indonesia, an archipelago of more than 250 million people, sits on the Pacific "Ring of Fire" and is prone to earthquakes and volcanic eruptions. Government seismologists monitor more than 120 active volcanoes. Along with the eruption of Mount Semeru, Indonesia's Mount Sinabung, Merapi, Lewatolo, Mount Ibu and Mount Dukono is also erupting with a further 3 showing activity.