Table 1.2.

Major dome collapses (>10×106×m3)

DateVolume (106 m3)Summit– base elevation (m asl)DirectionAsh plume altitude (gas) (km asl)SO2 loading (kt)Possible precursors
22 September 199711975–860North9–12Hybrids growth switch
26 December 1997461030–720South1531Hybrids
3 July 1998191030–730East1411Gas pressure, rainfall
20 March 200028945–740East93.4Rainfall, growth switch
29 July 2001451000–840East1133Rainfall
12 July 20032301116–680East15 (17)100Hybrids, rainfall
20 May 20061021006East17 (20)200LPs, rainfall, growth switch
11 February 2010451110–800North1560