An increased number of deep volcanic earthquakes at Ruang in April prompted PVMBG to raise the Alert Level to 2 (on a scale of 1-4).
A total of 232 deep volcanic earthquakes were recorded by the seismic network during 1 April-22 June, with just over half of them occurring in early to mid-April.
No data was recorded from 18 April through 11 May due to technical difficulties.
The network recorded 6-20 events during 11-31 May and just 1-2 events during 1-21 June.
PVMBG lowered the Alert Level to 1 on 23 June.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Bulusan (Philippines)