Photo taken on Aug. 11, 2021 shows Mount Merapi spewing volcanic materials as seen at Turgo village in Sleman district, Yogyakarta, Indonesia. (Photo: Xinhua)

Photo taken on Aug. 11, 2021 shows Mount Merapi spewing volcanic materials as seen at Turgo village in Sleman district, Yogyakarta, Indonesia. (Photo: Xinhua)

Photo taken on Aug. 11, 2021 shows Mount Merapi spewing volcanic materials as seen at Turgo village in Sleman district, Yogyakarta, Indonesia. (Photo: Xinhua)

Photo taken on Aug. 11, 2021 shows Mount Merapi spewing volcanic materials as seen at Turgo village in Sleman district, Yogyakarta, Indonesia. (Photo: Xinhua)