Report on Taal (Philippines) — February 1978
Scientific Event Alert Network Bulletin, vol. 3, no. 2 (February 1978)
Managing Editor: David Squires.
Taal (Philippines) Harmonic tremor continues, but no eruption
Please cite this report as:
Global Volcanism Program, 1978. Report on Taal (Philippines) (Squires, D., ed.). Scientific Event Alert Network Bulletin, 3:2. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN197802-273070.
14.002°N, 120.993°E; summit elev. 311 m
All times are local (unless otherwise noted)
"The renewed activity of Taal on 9 November resulted in the formation of a circular conelet protruding a few meters from the floor of the elongated 1976 crater. Voluminous ash-laden clouds rose to a height of 500 m with a roaring sound audible on the lakeshore. Bluish fumes were emitted from the NE inner wall of the 1976 crater. Eruptive activity ended by the early morning of 12 November, but volcanic tremor of varying amplitude continued. Tremor with a maximum double amplitude was recorded at 2210 on 24 November and at 0504 on 25 November. The initial evacuation procedure remained in effect in late January."
Further References. Ruelo, H.B., 1983, Morphology and crater development of the Mt. Tabaro eruption site, Taal volcano, Philippines: Philippine Journal of Volcanology, v. 1, no. 2, p. 19-68.
Wolfe, J.A., 1980, Eruptions of Taal volcano 1976-1977: EOS, v. 61, p. 57-58.
Geologic Background. 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.