The 9,737-foot Mount Merapi volcano sits on the densely populated island of Java. No residents were evacuated Wednesday morning, but officials are closely monitoring the volcano’s activity.

TOPSHOT – People look up at Mount Merapi, Indonesia’s most active volcano, as it spews rocks and ash out for another day in Yogyakarta on January 27, 2021. (Photo by Agung Supriyanto / AFP) (Photo by AGUNG SUPRIYANTO/AFP via Getty Images)