Report on Taal (Philippines) — November 1977
Natural Science Event Bulletin, vol. 2, no. 11 (November 1977)
Managing Editor: David Squires.
Taal (Philippines) Ejection of voluminous ash-laden steam clouds on 9 November
Please cite this report as:
Global Volcanism Program, 1977. Report on Taal (Philippines) (Squires, D., ed.). Natural Science Event Bulletin, 2:11. Smithsonian Institution.
14.002°N, 120.993°E; summit elev. 311 m
All times are local (unless otherwise noted)
Taal ejected voluminous ash-laden steam clouds at 1200 on 9 November. The clouds, similar to those of 3 October, rose about 250 m before being blown toward the mainland by a moderately strong NE wind. Ground probe temperatures have increased, and harmonic tremor continued at about the same amplitude. Initial evacuation procedures remained in effect.
Geological Summary. Taal is one of the most active volcanoes in the Philippines and has produced some of its most powerful historical eruptions. Though not topographically prominent, its prehistorical eruptions have greatly changed the landscape of SW Luzon. The 15 x 20 km Talisay (Taal) caldera is largely filled by Lake Taal, whose 267 km2 surface lies only 3 m above sea level. The maximum depth of the lake is 160 m, and several eruptive centers lie submerged beneath the lake. The 5-km-wide Volcano Island in north-central Lake Taal is the location of all historical eruptions. The island is composed of coalescing small stratovolcanoes, tuff rings, and scoria cones that have grown about 25% in area during historical time. Powerful pyroclastic flows and surges from historical eruptions have caused many fatalities.
Information Contacts: G. Andal, COMVOL, Quezon City.