TAAL VOLCANO

 

NAME OF VOLCANO:                        TAAL

LOCATION:                                         Batangas  (1400.1' N, 12059.1' E)

 

 

PHYSICAL FEATURES

Elevation:  0.311 km        

Type of Volcano:  Tuff cone

Crater Lakes/Caldera/Maars:        

MAIN CRATER LAKE - 1.9 km in diameter; blue-green in color, 4 m above sea level, deepest point: 76 m

                               Taal Volcano Island has 47 craters and 4 maars

TAAL CALDERA - 25 km across and formed between 140,000 to 5,380 BP

TAAL LAKE - inside the caldera; 267 sq. km and 2 m above sea level    

Adjacent Volcanic Edifice:  Makiling (NE)  Malepunyo (E), Batulao (W) and Macolod (SE)

 

 

GEOLOGICAL FEATURES

Rock Type:  Olivine basalt, Andesite         

Tectonic Setting:  Macolod Corridor          

Age of Deposits:  5380+_ 170 ybp (Radiocarbon age, Listanco, 1994)

 

 

VOLCANIC ACTIVITY

Number of Historical Eruptions:  33

Latest Eruption/Activity:  1977 Oct. 3

Eruption Type:

1. Phreatic (e.g. 1878, 1911, 1970)

2. Phreatomagmatic (e.g. 1749, 1965, 1966)

3. Strombolian (e.g. 1968, 1969)

4. Plinian (e.g. 1754)

Precursors to Eruptions:

1. Increase in frequency of quakes with occasional felt events accompanied by rumbling sounds

2. Increase in temperature and level of Main Crater Lake

3. Development of new thermal areas and/or reactivation of old ones

4. Ground swells or inflation and ground fissuring

5. Increase in temperature of ground probe holes at Mt. Tabaro

6. Sulfuric odor and acrid fumes

7. Fish kills and drying up of vegetation

 

 

VOLCANIC HAZARDS

Type of Hazards:

1. Base surges

2. Ashfalls and ballistic projectiles

3. Lava flows

4. Seiches/Tsunamis and flooding

5. Lakeshore landslide

6. Fissuring and ground subsidence

Permanent Danger Zone:  Entire Volcano Island

Other Buffer Zones:  Lakeshore barangays of Talisay, Agoncillo, San Nicolas and Laurel

Areas To be Evacuated:

In case of an eruption similar in nature and magnitude to:

1965 ACTIVITY - entire Volcano Island and four lakeshore barangays of Agoncillo and Laurel

1911 ACTIVITY - entire Volcano Island and lakeshore barangays of Talisay, Tanauan, Agoncillo, Balete, San Nicolas and Laurel

 

Additional areas to be evacuated shall be determined based on the development in eruptive style and location of the monitored parameters.

  

 

MONITORING ACTIVITY

Volcano Observatory:  Taal Volcano Observatory, Buco, Talisay   -  9.7 km N of Main Crater

                                        (12059.06’E, 1405.10’N)

Monitoring Methods:

1. Seismic monitoring  (number of volcanic quakes and tremors)

2. Visual observations

3. Ground deformation (EDM, precise leveling, tilt)

4. Main Crater Lake chemistry, temperature and level

Monitoring Stations

A – Seismic Network

         Central Receiving & Processing Station:  Taal Volcano Observatory, Buco, Talisay

         Seismic stations: Binintiang Munti,  Calauit,  Main Crater and Pira-piraso

         Repeater stations:  Tagbakin,  Napayung and  Daang Kastila

 

B – Ground Deformation Network

         EDM lines: Tagbakin (instrument site) to Calauit (2 lines), . Buco (instrument site) to Pira-piraso (2 lines), Bilibinwang (instrument site) to Saluyan, Eruption Site (Tabaro), Alas-as

         Precise leveling lines: Calauit, Kaygabok Alas-as, Pira-piraso

         Electronic tilt: Daang Kastila, Calauit