PHIVOLCS reported continuing low-level unrest at Taal during 13-20 June characterized by elevated seismicity, upwelling in the lake, and sulfur dioxide gas emissions. There were 20-38 daily volcanic earthquakes recorded during 13-17 June and a total of 11 recorded during 19-20 June. There were 2-46 daily periods of tremor, each lasting 2-67 minutes long. Daily white steam-and-gas plumes (sometimes voluminous) rose as high as 3 km above the lake and drifted NE, NW, and SW; voggy conditions were reported during 16-17 June. Upwelling gasses and hot fluids in the lake were visible during 14-17 June. Sulfur dioxide emissions averaged 7,643 and 2,177 tonnes per day on 15 June and 19 June, respectively. The Alert Level remained at 1 (on a scale of 0-5), and PHIVOLCS reminded the public that the entire Taal Volcano Island was a Permanent Danger Zone (PDZ).

Geological Summary. Taal is one of the most active volcanoes in the Philippines and has produced some powerful eruptions. The 15 x 20 km Talisay (Taal) caldera is largely filled by Lake Taal, whose 267 km2 surface lies only 3 m above sea level. The maximum depth of the lake is 160 m, with several submerged eruptive centers. The 5-km-wide Volcano Island in north-central Lake Taal is the location of all observed eruptions. The island is composed of coalescing small stratovolcanoes, tuff rings, and scoria cones. Powerful pyroclastic flows and surges have caused many fatalities.

Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)