| The eruption sent a pyroclastic flow of superheated gases and debris racing down Merapi's slopes. |
| The tracks are impressed on a volcanic pyroclastic flow deposit and buried under volcanic ash. |
| The pyroclastic zone, also known as the pyroclastic flow, was created where hot pumice poured out of the volcano, sterilizing the earth. |
| The pyroclastic deposits mainly consist of block-and-ash, blast, tephra fallout and secondary pyroclastic flow deposits. |
| Major valleys cutting the volcano's flanks have been partly or completely filled in by pyroclastic flow deposits and lahars. |
| Secondary pyroclastic flow deposits are locally exposed, generally infilling palaeochannels with no lateral continuity, and commonly overlying blast deposits. |
