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Philippines - Taal Volcano alert status lowered to Level 1

Philippines - Phivolcs warns of high carbon dioxide levels at Taal Volcano crater - Alert Level raised to 2 - 115 volcanic earthquakes during the past 24 hours

Philippines - Phivolcs warns of high carbon dioxide levels at Taal Volcano crater - Alert Level raised to 2 - 115 volcanic earthquakes during the past 24 hours

<TABLE class=contentpaneopen><TBODY><TR><TD class=contentheading width="100%">TAAL VOLCANO Advisory, 30 May 2011, 8:00 A.M. </TD></TR></TBODY></TABLE><TABLE class=contentpaneopen><TBODY><TR><TD class=createdate vAlign=top colSpan=2>Monday, 30 May 2011 14:15 </TD></TR><TR><TD vAlign=top colSpan=2>
This is a notice of a remarkable increase in the seismic activity of Taal Volcano.


For the past 24 hours, Taal?s seismic network detected a total of one hundred fifteen (115) volcanic earthquakes during the past 24 hours. Twelve of these events were felt at Intensity I ? IV by residents of Pira-piraso, Alas-as and Calauit located at northeast, southwest and southeast sectors of Volcano Island, respectively. One of these events (8:32 PM, 29 May) was felt at Intensity I, nine (9) events (1:02:19 AM, 1:02:26 AM, 2:32 AM, 2:53 AM, 2:12 AM, 3:08:19 AM, 3:08:52 AM, 3:17 AM, 3:19 AM, 3:26 AM 30 May) were felt at Intensity II, one event (1:26 AM 30 May) was felt at Intensity III and another one (1:05 AM 30 May) was felt at Intensity IV. All of these felt events were reportedly accompanied by rumbling sounds.
Field measurements conducted on 24 May 2011 at the eastern sector inside the Main Crater Lake showed that the water temperature slightly increased from 32.5<SUP>?</SUP>C to 32.8?C, and the pH value became more acidic decreasing from 2.83 to 2.67. Results of the ground deformation survey (precise leveling) conducted around the Volcano Island last 26 April - 03 May 2011 showed that the volcano edifice inflated slightly relative to the 05-11 April 2011 survey. Measurement of carbon dioxide (CO2) gas emission rates last 03-04 May 2011 at Taal Main Crater Lake yielded a value of 2,057 tonnes per day (t/d) which is twice the background level.

In view of the above observations, PHIVOLCS reiterates Alert Level 2 over Taal Volcano. This means that magma has been intruding towards the surface, as indicated by the continuing high level of seismic activity and sustained high emission rate of CO2 being released in the Main Crater Lake. PHIVOLCS advises the public that the Main Crater, Daang Kastila Trail and Mt. Tabaro (1965-1977 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 toxic gases can be lethal to human, animals and even cause damage to vegetation. In addition, it is reminded that the entire Volcano Island is a Permanent Danger Zone (PDZ), and permanent settlement in the island is strictly not recommended. DOST-PHIVOLCS is closely monitoring Taal Volcano?s activity and any new significant development will be immediately relayed to all concerned.
DOST-PHIVOLCS

http://www.phivolcs.dost.gov.ph/


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Philippines - Taal Volcano alert status lowered to Level 1

<TABLE class=contentpaneopen><TBODY><TR><TD class=contentheading width="100%">Taal Volcano Bulletin, 05 July 2011, 08:00 AM </TD></TR></TBODY></TABLE><TABLE class=contentpaneopen><TBODY><TR><TD class=createdate vAlign=top colSpan=2>
Tuesday, 05 July 2011 07:26

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This is a notice for the lowering of Taal Volcano?s status from Alert Level 2 to Alert Level 1.


Eleven (11) weeks after Taal Volcano?s alert status was raised from Level 1 to Level 2 on 09 April 2011, the following monitoring parameters have been observed:

1. The number of volcanic earthquakes recorded daily gradually declined to low levels beginning 1<SUP>st</SUP> week of June 2011. From June 2 to 5, four (4) to eight (8) volcanic earthquakes were detected per day. Since June 6 to present, the number of recorded volcanic earthquakes further decreased to a daily count of zero (0) to six (6) small events. No perceptible volcanic earthquake has occurred since 02 June.

2. Hydrothermal and steaming activities in the northern and northeast sides of the Main Crater and Daang Kastila area have abated. Since 01 June 2011, the Main Crater Lake temperature remained at 32.5<SUP>?</SUP>C to 33.4<SUP>?</SUP>C, and despite becoming more acidic, measured pH of 2.78 ? 2.59 vary around the baseline level of pH above 2.5. All other geochemical parameters are returning to background levels. Bubbling activity at the northeastern sector of Main Crater Lake weakened and the activity has ceased in some of the bubbling sites.

3. Ground temperature and total magnetic field measurements at Daang Kastila and in the Main Crater showed no significant changes in both parameters.

4. Carbon Dioxide (CO<SUB>2</SUB>) gas measurements at the Main Crater Lake since March 2011 showed a decreasing trend. From an elevated value of 4,670 tonnes per day (t/d) in March, CO<SUB>2 </SUB>decreased to 2,057 t/d in May and then to 1,821 t/d in June.

5. Precise leveling in June 2011 along the flanks of Volcano Island and Global Positioning System (GPS) data from November 2010 to June showed that the volcano is slightly inflated. Ground deformation data, nonetheless, are not suggestive of large pressure build-up within the volcano edifice.

The above observations suggest that Taal Volcano?s activity has declined. In view thereof, PHIVOLCS is now lowering the status of the volcano from Alert Level 2 to Alert Level 1. This means that a large hazardous eruption is now less probable within the immediate future. The public, however, is reminded that the Main Crater should be strictly off-limits to the public because sudden steam explosions may occur and high concentrations of toxic gases may accumulate. The northern portion of the Main Crater rim, in the vicinity of Daang Kastila Trail, may also be hazardous when increased steam emission is reactivated along existing fissures. The public is also reminded that the entire Volcano Island is a Permanent Danger Zone (PDZ), and permanent settlement in the island is discouraged.
PHIVOLCS-DOST​



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