Sunday, April 24, 2011

[Geology2] 21 quakes recorded around Taal in 24 hours

21 quakes recorded around Taal in 24 hours

Volcanic activity around Taal Volcano in Batangas intensified anew on Monday, with state volcanologists recording 21 quakes in the last 24 hours.

The Philippine Institute of Volcanology and Seismology (Phivolcs) said one of the
quakes was felt at Intensity II at 10:06 a.m. on Sunday.

"Twenty-one volcanic earthquakes were recorded by the seismic network around
Taal Volcano during the past 24 hours. One of these events which occurred at 10:06 a.m. (Sunday) was felt by residents at Intensity II in Brgy. Calauit," Phivolcs said in an update posted on its website on Monday.

Phivolcs added that the water temperature at the west side of the Main Crater Lake (via Alas-as) increased slightly from 29.8 to 30.1 degrees Celsius.

Phivolcs said Alert Level 2 remains over Taal Volcano meaning that magma has been intruding toward the surface.

Phivolcs maintained the Main Crater, Daang Kastila Trail and Mt. Tabaro 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 humans and animals, or cause damage to vegetation, Phivolcs added.

It also reminded the public the entire Volcano Island is a Permanent Danger Zone (PDZ), and permanent settlement in the island is strictly not recommended.

Two quakes at Bulusan

Meanwhile, at Bulusan Volcano in Sorsogon, Phivolcs recorded two volcanic earthquakes in the last 24 hours, along with moderate steaming on the northwest vent and very weak steaming at the southeast vent.

Phivolcs said Bulusan's status remains at Alert Level 1.

"Entry to the 4-kilometer (km) radius Permanent Danger Zone (PDZ) is strictly prohibited, since the area is at risk to sudden steam and ash explosions. Due to the prevailing wind direction, residents in the northwest and southwest sectors of the volcano are reminded to take precautions against ashfalls," it said.

People living near valleys and river/stream channels should be vigilant against sediment-laden stream flows and lahars in the event of heavy and prolonged rainfall, it added.

Mayon Volcano quiet

Phivolcs said no volcanic earthquake was recorded at Mayon Volcano's seismic
network in Albay during the past 24 hours.

However, it noted weak white steam drifting southwest.

Alert Level 1 remains over Mayon Volcano, with the public reminded not to
enter the 6-km radius Permanent Danger Zone (PDZ) "due to the continuing
threat from sudden small explosions and rockfalls from the upper and middle
slopes of the volcano."

"Active stream/river channels and those perennially identified as lahar
prone areas in the southern sector should also be avoided especially during
bad weather conditions or when there is heavy and prolonged rainfall,"
Phivolcs said. – VVP, GMA News

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