Wednesday, June 17, 2015

Philippines' Mt. Bulusan Erupts

Two strong phreatic (steam-based) eruptions have occurred at Mt. Bulusan in Luzon, Philippines. It's last known eruption was in 2011. According to Filipino news sources, the first eruption lasted about 10 minutes, followed about 20 minutes later by a shorter eruption. There is currently no danger of magma injection or lava flow from the volcano.

Phreatic eruptions can occur without warning at many active volcanoes, especially 'wet' ones like volcanoes that have crater lakes at their summits, glaciers, or other sources of water. What occurrs is that water seeps into the volcano, making contat with extremely hot rock. This flashes the water into steam, causing a huge pressure buildup and subsequent rock explosion.

The reason there is no further danger of a larger eruption, is that typically phreatic eruptions are not related to new magma being injected. They are only related to surface water seeping into the hot, mostly solid rocks.

PHIVOLCS is updating the situation on Twitter, so you can follow the developments there. 

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