The PHIVOLCS volcano observatory lowered the alert level for the volcano from Level 2 to Level 1 due to low-level values of monitoring data over the past two months.
The seismic network registered a drop in the average number of earthquakes per day (7) during 1 Jan-31 May in comparison with period from 13 June until so far with 0 daily quakes on average. This seismic calm period may hint a decreased shifting of magma intrusions, usually prone to rock fracturing and pressurization, within the shallow hydrothermal system.
GPS and Interferometric Synthetic Aperture Radar (InSAR) measurements in collaboration with ESA’s Sentinel-1 satellite detected a short-to-medium deflation pattern during Nov 21-June 22.
Sulfur dioxide (SO2) emissions, early indicator of fresh magma at depth, reached to a 1,214 tonnes/day in average between May-Jul with the latest reducing values of about 237 tonnes/day.
Steam-laden emissions continue at the crater vent, but at alesser intensity reaching an altitude of 300 to 2,400 m.
Source: Philippine Institute of Volcanology and Seismology volcano activity update 11 July 2022