21. The Philippine Institute of Volcanology and Seismology ( PHIVOLCS ) lists Mount Balungao as an inactive volcano. 22. These books brought volcanology to a far wider audience than previous works aimed at the scientific community. 23. Escher had a broad interest, but his research was mainly on crystallography, mineralogy and volcanology . 24. The Philippine Institute of Volcanology and Seismology provides a classification system for the volcanoes of the country. 25. Philippines Institute of Volcanology and Seismology ( Phivolcs ) lists Panay as " Inactive ". 26. In 2001 he became the head of the Geological Hazard Mitigation Division Volcanology and Geological Hazard Mitigation. 27. It incorporates exhibits on volcanology , archaeology and industrial history, with educational trails and information signs. 28. :: I learnt it elsewhere, but it is mentioned in the Volcanology of Io article. 29. But the Philippine Institute of Volcanology and Seismology doubts the volcano erupted because no tremors were recorded beforehand. 30. There were no casualties in the two blasts Thursday, the Philippine Institute of Volcanology and Seismology said.
