NDRRMC Update: SitRep No. 1 re Taal Volcano Update

  1. Situation Overview

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 Main Crater Lake that could eventually lead to an eruption.

For the past 24 hours, seismic network recorded six (6) volcanic earthquakes. Field observation and measurements conducted at the eastern sector inside the Main Crater Lake (via Calauit) on 5 April 2011 showed that steaming activity at the thermal areas was weak.

The water level further receded from 0.36 m to 0.33 m. Water temperature slightly increased from 30.0°C to 30.5°C and pH value also s lightly increased to 2.84 as compared to the last reading of 2.82 on 29 March 2011 denoting that the water became slightly less acidic.

Gas measurements conducted at Taal Main Crater Lake last January, February and March 2011 yielded CO2 emission values of 2,250 tonnes per day (t/d), 1,875 t/d and 4,670 t/d respectively. The remarkable increase in C02 concentration indicates anomalous gas release from the magma at depth.

Result of the ground deformation survey (precise leveling) conducted around the Volcano Island last 02-09 February 2011 showed that volcano edifice is slightly inflated as compared with the 15-23 December 2010 survey.

Precautionary Measures

PHIVOLCS advises the public that the Main Crater, Daang Kastila Trail and Mt. Tabaro (1965 Eruption Site) are strictly off-limits because sudden hazardous steam-driven explosions may occur and high concentrations of toxic gases may accumulate.
Breathing air with high concentration of gases can be lethal to human, animals and even cause damage to vegetation.

In addition, it is reminded that entire Volcano Island is a Permanent Danger Zone (PDZ), and permanent settlement in the island is strictly not recommended.

Affected Population

A total of 17 families / 77 persons voluntarily evacuated, evacuees came from Pulo Island. Three (3) families are currently staying at the Venancio Trinidad Sr. Memorial School while others opted to stay with their relatives.

  1. Actions Taken:

NDRRMC-OPCEN disseminated the information to RDRRMC-OCD Region IV-A through SMS, facsimile, website and NDRRMC Twitter account for further dissemination to their respective local DRRMCs from the provincial down to the municipal level

DOST-PHIVOLCS is closely monitoring Taal Volcano’s activity and any new significant development will be immediately relayed to all concerned

Preparedness Activities of PDRRMC Batangas

PDRRMC Batangas activated its Disaster Operation Center and placed on standby alert the member of the council

All lakeshores municipalities along Taal Lake conducted emergency meeting and alert their respective MDRRMC members

RDRRMC member agencies scheduled an emergency meeting on April 11,2011, 2:00 PM at Provincial Capitol, Batangas City

PDRRMC conducted inventory and readiness of resources and preparation for the activation of the Incident Command System

The PEO transported a Philippine Coast Guard boat to Talisay City CDRRMC Tagaytay post an advisory tourist on the Taal Volcano Continuous monitoring of the status of Taal Volcano