21. Volcanic ash fall events can disrupt and or damage the infrastructure upon which society depends. 22. Caldera forming activity occurred in several eruption phases, accompanied by pumice flows and ash fall . 23. Some residents were digging out old masks to protect their faces from potentially heavy ash fall . 24. Eruptions are typically phreatic explosions of small-to-moderate size that produce minor ash falls near the volcano. 25. Thirty-eight percent of the 1044 were found in the ash fall deposits, the majority inside buildings. 26. Much of the surface, including the Southern Spur, is covered by deposits left by ash fall . 27. Ash fall from volcanic eruptions affects the ecosystem.28. Heavy volcanic ash falls were observed as far away as Borneo, Sulawesi, Java and Maluku islands. 29. The argillite probably formed from volcanic ash falls . 30. No injuries or damage were reported, although ash falls forced an nearby airport to close temporarily.
