Global Volcanism Program | Image GVP-00698
A pyroclastic flow descends the SW flank of Merapi volcano on 14 June 1984. A long period of lava dome growth began on 2 October 1972, and continued intermittently until 1990, occasionally punctuated by partial dome collapse that formed pyroclastic flows (block-and-ash flows) that travel down the flanks.
Photo by Ministry of Public Works, 1984 (courtesy of Volcanological Survey of Indonesia).
This image is made available as a Public Domain Work, but proper attribution is appreciated.