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Bulusan Volcano, Luzon Island, Philippines (12.77°N, 124.05°E). Bulusan began to erupt at 1301 local time (GMT + 8 hours) on December 27, ejecting significant amounts of ash to about 1 km above the summit. Ash was blown to the WSW by the prevailing wind. The eruption lasted for 1 hour 13 minutes and was accompanied by hissing and rumbling. As of early January, some activity was continuing.

Bulusan's last eruption, in July and August 1978, produced voluminous ash-laden clouds 2.5–3 km high (see Sean Bulletins, 3, 7–8).