NDRRMC update - SitRep No. 3 re Taal Volcano Update

Situation Report
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Sources: DOST-PHIVOLCS and OCD Region IV–A


Alert Level 2 is hoisted over Taal Volcano, with the interpretation that magma has been intruding towards the surface, as manifested by CO2 being released in the Main Crater Lake and increase in seismic activity.

Taal Volcano’s (14.0000°N, 120.9833°E) seismic netw ork recorded eight (8) volcanic earthquakes during the past 24 hours. One (1) of these events which occurred on 1:48 PM, 12 April 2011, was felt at Intensity II by residents in Barangay Calauit at the southeastern part of Taal Volcano island with rumbling sounds. Water temperature slightly increased from 30.0°C to 30.5°C. Gas measu rements conducted at Taal Main Crater Lake last January, February and March 2011 yielded carbon dioxide (CO2) emission values of 2,250 tonnes per day (t/d), 1,875 t/d and 4,670 t/d respectively. This large increase in CO2 concentration indicates anomalous gas release from the magma at depth. Result of the ground deformation survey (precise levelling) conducted around the Volcano Island last 05 - 11 April 2011 showed that the volcano edifice is slightly inflated as compared with the 02 - 09 February 2011 survey.