July 1990 there was a 7.8 magnitude earthquake
From May-June '91 there were mini earthquakes, 5500 short tons of sulphur dioxide was emitted
On June 7th magma reached the surface and a 7km gas column was emitted
on June 12th high gas content magma was released and 5km3 of volcanic material was ejected - there was also a 22 mile ash cloud, pyroclastic flows and a 1.6 mile caldera formed
Secondary: a typhoon from 15th- 16th June led to lahars, roofs collapsed from the ash and disease occured in refugee camps
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