Indonesia's Geology Agency said satellite images show Anak Krakatau expanded by 32.8 hectares after September lava flows, with two nearby formations still under study.
Indonesia's Geology Agency said Anak Krakatau expanded by 32.8 hectares, about 81 acres, after eruptions produced lava flows, Reuters reported. Satellite imagery also detected two new land formations nearby.
The agency compared Sentinel images from 8 August and 15 September. The volcano erupted for 25 hours from 4 to 6 September, sending lava toward the northwest, west and southwest. Imagery from 23 September showed a formation about 760 metres northwest of the coastline and another about 495 metres to the southeast.
Officials said the formations, on either side of the crater, may be linked to the eruptions, but more recent data are needed to decide whether they are new eruption centres. The agency posted the comparison on social media in late September.
The September eruptions sent ash over Jakarta and surrounding areas and led to airport closures. Reuters reported that more than 340,000 travellers were affected and 2,961 flights were cancelled, delayed or diverted.
Anak Krakatau is one of about 130 active volcanoes in Indonesia, on the Pacific Ring of Fire. It rose in the area of Krakatau, whose 1883 eruptions killed more than 36,000 people after a series of tsunamis.