Manila, Oct. 23 -- Kanlaon Volcano spewed ash twice on Thursday, the Philippine Institute of Volcanology and Seismology (Phivolcs) said.

The first occurred from 5:30 a.m. to 7:29 a.m., and the second from 7:39 a.m. to 8:05 a.m.

These generated grayish plumes reaching 600 meters high.

The volcano is still under Alert Level 2, Phivolcs said.

Earlier, Phivolcs Director Teresito Bacolcol said ash emission is expected for Kanlaon Volcano since it is under Alert Level 2 or moderate level of unrest.

Ash emissions happen when there is a new release of volcanic gas and pressure.

Degassing brings fine and dry materials or ash that can be found on the volcano's crater, Bacolcol said.

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