Philippine Institute of Volcanology and Seismology
Taal Volcano Bulletin 19 June 2013 8:00 A.M. PDF Print
Tuesday, 18 June 2013 23:42

Taal Volcano’s (14.0000°N, 120.9833°E) seismic network recorded one (1) volcanic earthquake during the past 24-hour observation period. Field measurements last 13 June 2013 at the western sector of the Main Crater Lake yielded a slight decrease in water temperature of 32.5°C from 33.2°C, increase in water level of 0.25 meter from 0.24 meter, and water acidity remained at pH 3.03.  Ground deformation survey in the Volcano Island on 23 May-01 June 2013 denoted slight deflation at Calauit, Alas-as, Pira-piraso, Daang Kastila and New Eruption Site precise leveling lines compared to the February 2013 survey.  However, GPS data for the period of October 2012 to first week of May 2013 show inflationary changes in ground deformation while the edifice is still slightly inflating in general compared to February 2011 baseline data. Carbon dioxide (CO2) emission at the Main Crater Lake increased to 947 tonnes per day on 03 March 2013 compared to 720 tonnes per day last 27 November 2012.

Alert Level 1 remains in effect over Taal Volcano. This means that hazardous eruption is not imminent. The public, however, is reminded that the Main Crater should be strictly off-limits 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 become hazardous when steam emission along existing fissures suddenly increases.  Furthermore, the public is also reminded that the entire Volcano Island is a Permanent Danger Zone (PDZ), and permanent settlement in the island is strongly not recommended.

DOST-PHIVOLCS

 
PHIVOLCS, OCD launch Valley Fault System Atlas PDF Print
Monday, 18 May 2015 10:20

With the consolidated mapping activities of the Philippine Institute of Volcanology and Seismology (PHIVOLCS) and efforts by partner-agencies, the Valley Fault System (VFS) Atlas, a handbook of large scale maps showing in detail areas traversed by the Valley Fault System, was finally unveiled on May 18, 2015 at the institute’s auditorium, Quezon City.

It can be recalled that PHIVOLCS’ mapping efforts redefined the location of fault traces and validated previously mapped traces of the VFS.

The atlas was a result of PHIVOLCS’ review of the VFS as one of the component activities of the AusAid-funded GMMA Ready Project under the United Nations Development Programme (UNDP) and implemented by member agencies of the National Disaster Risk Reduction and Management Council (NDRRMC) back in 2012.

The VFS is an active fault system in the Greater Metro Manila Area (GMMA) with two fault traces: the 10 km long East Valley Fault in Rizal and the 100 km long West Valley Fault runs through different cities and towns of Bulacan, Rizal, Metro Manila, Cavite and Laguna. The West Valley Fault can generate a large earthquake which poses threat to people’s lives, buildings and infrastructures, and livelihood.

Director Renato U. Solidum Jr. of PHIVOLCS said that the location of active faults is a major basis for people’s preparedness for earthquakes, appropriate land use, contingency planning for disaster response, and design of houses, buildings and infrastructures. Future development needs to consider these faults so people won’t be at risk.

Undersecretary Alexander P. Pama, Administrator of Office of Civil Defense (OCD) and Executive Director of NDRRMC emphasized in his keynote message that the atlas is a solid reference in the selection of evacuation centers, safe routes and other risk management items.

“Extensive preparations and proper coordination of actions and sharing of expertise are in order so that we can, as a national team, win this important game in our administration of our duties and responsibilities, not only to your partners and shareholders but to your constituents as well,” he added.

UNDP Country Director Titon Mitra said in his message that it’s not the earthquakes that kill people but the poor planning practices, inadequate preparedness and the lack of application of appropriate building standards.

Chairperson Atty. Francis Tolentino stated in a message that as a partner of the GMMA Ready project, the Metropolitan Meanila Development Authority (MMDA) vows to help in decreasing the vulnerability of GMMA to natural hazards and strengthening its resiliency by managing disaster and climate change risks.

Mayor Herbert Bautista of Quezon City expressed his appreciation upon receiving a copy of the atlas and showed willingness to look into the stability of the city’s infrastructures.

Mayor Reynaldo San Pedro of San Jose del Monte City, Bulacan, officers of Metro Manila Disaster Risk Reduction and Management, Bulacan, Rizal, Cavite and Laguna and project partners from Philippine Atmospheric and Astronomical Services Administration (PAGASA), Mines and Geosciences Bureau (MGB), National Mapping and Resource Information Authority (NAMRIA), Climate Change Commission, Housing and Land Use Regulatory Board (HLURB), and Department of Interior and Local Government (DILG) also attended the launching and received copies of the material.

 
BULUSAN VOLCANO BULLETIN 29 May 2015 8:00 A.M. PDF Print
Thursday, 28 May 2015 23:44

Bulusan Volcano’s (12°46.2’N, 124°03’E) seismic monitoring network recorded four (4) volcanic earthquakes during the past 24-hour observation period.  Weak emissions of white steam plumes that drifted southwest were observed.  Precise Leveling surveys conducted from May 5 to May 14, 2015 indicate very slight inflation of the volcano’s edifice relative to the March 2015 surveys.

Alert Level 1 (abnormal) remains in effect over Bulusan Volcano. This indicates that hydrothermal processes may be underway beneath the volcano that may lead to more steam-driven eruptions. The local government units and the public are reminded that entry to the 4-kilometer radius Permanent Danger Zone (PDZ) is strictly prohibited due to the possibility of sudden and hazardous steam-driven or phreatic eruptions. Civil aviation authorities must also advise pilots to avoid flying close to the volcano’s summit as ash from any sudden phreatic eruption can be hazardous to aircraft. Furthermore, people living within valleys and along river/stream channels should be vigilant against sediment-laden stream flows and lahars in the event of heavy and prolonged rainfall. DOST-PHIVOLCS is closely monitoring Bulusan Volcano’s condition and any new development will be relayed to all concerned.

 
BULUSAN VOLCANO BULLETIN 27 May 2015 8:00 A.M. PDF Print
Tuesday, 26 May 2015 23:32

Bulusan Volcano’s (12°46.2’N, 124°03’E) seismic monitoring network recorded two (2) volcanic earthquakes during the past 24-hour observation period.  Weak to moderate emissions of white steam plumes that drifted southwest were observed.  Precise Leveling surveys conducted from May 5 to May 14, 2015 indicate very slight inflation of the volcano’s edifice relative to the March 2015 surveys.

Alert Level 1 (abnormal) remains in effect over Bulusan Volcano. This indicates that hydrothermal processes may be underway beneath the volcano that may lead to more steam-driven eruptions. The local government units and the public are reminded that entry to the 4-kilometer radius Permanent Danger Zone (PDZ) is strictly prohibited due to the possibility of sudden and hazardous steam-driven or phreatic eruptions. Civil aviation authorities must also advise pilots to avoid flying close to the volcano’s summit as ash from any sudden phreatic eruption can be hazardous to aircraft. Furthermore, people living within valleys and along river/stream channels should be vigilant against sediment-laden stream flows and lahars in the event of heavy and prolonged rainfall. DOST-PHIVOLCS is closely monitoring Bulusan Volcano’s condition and any new development will be relayed to all concerned.

 
MAYON VOLCANO BULLETIN 19 June 2013 8:00 A.M. PDF Print
Tuesday, 18 June 2013 23:43

Mayon Volcano’s (13.2500°N, 123.6833°E) seismic network did not detect any volcanic earthquake during the past 24-hour observation period. Steaming activity was not observed due to thick clouds covering the summit crater. No crater glow was observed last night. Sulfur dioxide (SO2) emission on 14 June 2013 was measured at an average of 133 tonnes/day. Ground deformation survey (precise levelling) on the third week of May 2013 showed slight inflation of the edifice compared to February 2012, with the volcano still slightly inflated compared to January 2010 baselines.

Mayon Volcano’s alert status remains at Alert Level 1, which means that it is at abnormal condition.  Although this means that presently no magmatic eruption is imminent, it is strongly advised that the public refrain from entering the 6-kilometer radius Permanent Danger Zone (PDZ) due to the perennial life-threatening dangers of rockfalls, landslides/avalanches at the middle to upper slope, sudden ash puffs and steam-driven or phreatic eruptions from the summit. Active stream/river channels and those identified as perennially lahar-prone areas on all sectors of the volcano should also be avoided especially during extreme weather conditions when there is heavy and prolonged rainfall. DOST-PHIVOLCS maintains its close monitoring of Mayon Volcano and any new development will be communicated to all concerned stakeholders.

DOST-PHIVOLCS

 
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