Photo taken on Sept. 8, 2021 shows volcanic materials spewing from Mount Merapi seen from Tunggularum village in Sleman district, Yogyakarta, Indonesia. (Photos: Xinhua)

Photo taken on Sept. 8, 2021 shows volcanic materials spewing from Mount Merapi seen from Tunggularum village in Sleman district, Yogyakarta, Indonesia.

Photo taken on Sept. 8, 2021 shows volcanic materials spewing from Mount Merapi seen from Srumbung village in Magelang, Central Java, Indonesia.

Photo taken on Sept. 8, 2021 shows volcanic materials spewing from Mount Merapi seen from Srumbung village in Magelang, Central Java, Indonesia.