Presentation on taal volcano preparedness activities

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This was presented by the PADC at the TVPL PAMB meeting. Drills have been conducted as well as a full census of residents on volcano island.

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Presentation on taal volcano preparedness activities

  1. 1. UPDATES ON THE STATUS OF TAAL VOLCANO
  2. 2. TAAL VOLCANO ISLAND : 23 square kilometers or 2,300 Ha in area; highest point of the island: 311 meters above sea level (SW rim of the Main Crater). The volcano – geomorphic features of the island suggest that there are at least 35 eruption cones and 47 craters of depressions formed either by direct explosive eruptions or collapsed subsidence. The underwater bathymetry suggests the presence of about 35 different volcanic landforms. This strongly indicates that eruption centers of Taal Volcano are numerous, complex and may erupt from any other points. MAIN CRATER : 1.9 km in diameter; and TAAL CALDERA : 25 km across. GENERAL INFORMATION
  3. 3. 23 square kilometers or 2,300 Ha
  4. 4. Calawit San Isidro/Pulo Pulang Bato Alas-as Tabla
  5. 6. Historical Eruption Centers <ul><li>Main Crater (ex. 1749, 1754, 1911 eruptions) </li></ul><ul><li>Binintiang Malaki (ex. 1767, 1715 eruptions) </li></ul><ul><li>Binintiang Munti (ex. 1709, 1731 eruptions) </li></ul><ul><li>Pira-piraso (ex. 1731 eruption) </li></ul><ul><li>Off Calauit (ex. 1716 eruption) </li></ul><ul><li>Mt. Tabaro (1965-1970, 1976-1977 eruptions) </li></ul>1965 eruption site (Mt. Tabaro) 1911 eruption site (Main Crater)
  6. 7. Map of eruption centers of Taal Volcano
  7. 8. <ul><li>VOLCANIC HAZARDS Associated with the Eruption of Taal Volcano </li></ul><ul><ul><li>Ashfall and ballistic projectiles </li></ul></ul><ul><ul><li>Lava flow </li></ul></ul><ul><ul><li>Base surges (rapidly moving mixture of volcanic debris and steam) </li></ul></ul><ul><ul><li>Seiche/Tsunami and flooding </li></ul></ul><ul><ul><li>Fissuring and subsidence </li></ul></ul><ul><ul><li>Lakeshore landslide </li></ul></ul>
  8. 10. Ashfall and ballistic projectiles Houses covered covered with asfall deposits during the 1965 eruption
  9. 11. Lava flows during the 1968 and 1969 eruptions Eruption site: Mt. Tabaro Lava flows
  10. 12. LAVA FOUNTAINING
  11. 14. Effect s of base surge at Taal Volcano during the 1911 and 1965 eruptions Taal base surge, 1965 PYROCLASTIC FLOW/ BASE SURGE - turbulent mass of ejected fragmented volcanic materials (ash and rocks), mixed with hot gases that flow downslope/ away from crater at very high speed ( > 60 kph)
  12. 16. The 1965 eruption of Taal Volcano generated a seiche at Taal Lake killing several people crossing the lake. Seiches/Tsunami and flooding 1911 – generated seiches 2.5-3.0 m high above lake level 1965 – generated seiches 4.7 m high above the lake level and swept inshore as much as 80 m
  13. 17. Taal Volcano Alert Signals Alert Level Criteria Interpretation 0 Background, quiet No eruption in foreseeable future. 1 Low level seismicity, fumarolic, other activity Magmatic, tectonic or hydrothermal disturbance; no eruption imminent. 2 Low to moderate level of seismicity, persistence of local but unfelt earthquakes. Ground deformation measurements above baseline levels. Increased water and/or ground probe hole temperatures, increased bubbling at Crater Lake. A) Probable magmatic intrusion; could eventually lead to an eruption.   B) If trend shows further decline, volcano may soon go to level 1 3 Relatively high unrest manifested by seismic swarms including increasing occurrence of low frequency earthquakes and/or harmonic tremor (some events felt). Sudden or increasing changes in temperature or bubbling activity or radon gas emission or crater lake pH. Bulging of the edifice and fissuring may accompany seismicity. A) If trend is one of increasing unrest, eruption is possible within days to weeks.   B) If trend is one of decreasing unrest, volcano may soon go to level 2 4 Intense unrest, continuing seismic swarms, including harmonic tremor and/or “low frequency earthquakes” which are usually felt, profuse steaming along existing and perhaps new vents and fissures. Hazardous explosive eruption is possible within days. 5 Base surges accompanied by eruption columns or lava fountaining or lava flows. Hazardous eruption in progress. Extreme hazards to communities west of the volcano and ashfalls on downwind sectors.
  14. 18. <ul><li>(Alert Level 1 raised on 23 Nov. 2005 due to seismic swarm ) </li></ul><ul><li>08 June 2010- alert Level 2 was raised. </li></ul><ul><li>Beginning last week of April 2010, monitored parameters have shown anomalous change as indicated by the following observations: </li></ul><ul><li>  Since 26 April 2010, the number of volcanic earthquakes detected per day continued to increase. For the past 24 hours, 32 high frequency volcanic earthquakes were detected. The size of recorded earthquakes has also been increasing. In addition, a low frequency type volcanic earthquake was detected on 02 June 2010. </li></ul><ul><li>  </li></ul>Raising of Alert Status
  15. 19. Close-up photo of existing steaming vent
  16. 20. PREPAREDNESS ACTIVITIES ON TAAL VOLCANO ERUPTION
  17. 21. CONTINGENCY PLANNING
  18. 22. CONSOLIDATED INVENTORY OF RESOURCES BY SECTOR/COMMITTEE
  19. 23. RELOCATION/ LIVELIHOOD
  20. 24. ESTABLISHMENT OF INCIDENT/ADVANCED COMMAND POST/ SYSTEM (ICP/ACP)
  21. 25. FLOW OF INFORMATION/ COMMUNICATION
  22. 26. EVACUATION BRIEFING AND DRILL
  23. 27. THANK YOU….

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