<Li> c. 7000 BC (Pasbul Eruptive Period). Its eruptions were as energetic, if not as voluminous as the Inararo eruptions . </Li> <Li> c. 4000--3000 BC (Crow Valley Eruptive Period). This and the Mara - unot period's eruptions were smaller than the Inararo eruptions but about 2 to 3 times as big as that of 1991 based on the pyroclastic flow runout distances and depths of valley filling . </Li> <Li> c. 1900--300 BC (Maraunot Eruptive Period) </Li> <Li> c . AD 1500 (Buag Eruptive Period). Its eruptions were roughly the same size as those of 1991 . </Li>

What are the areas in the philippines affected by lahar when mt. pinatubo erupted in 1991