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Report on Farallon de Pajaros (United States) — September 1981

Scientific Event Alert Network Bulletin, vol. 6, no. 9 (September 1981)
Managing Editor: Lindsay McClelland.

Farallon de Pajaros (United States) Normal fuming and discolored water

Please cite this report as:

Global Volcanism Program, 1981. Report on Farallon de Pajaros (United States). In: McClelland, L. (ed.), Scientific Event Alert Network Bulletin, 6:9. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN198109-284140.

Volcano Profile |  Complete Bulletin


Farallon de Pajaros

United States

20.546°N, 144.893°E; summit elev. 337 m

All times are local (unless otherwise noted)


"A 16 July USN flight also covered the Quaternary volcanoes of the Marianas. Fuming and discolored water were observed at Farallon de Pajaros but were not anomalous conditions."

Geologic Background. The small 2-km-wide island of Farallon de Pajaros (also known as Uracas) is the northernmost and most active volcano of the Mariana Islands. Its relatively frequent historical eruptions dating back to the mid-19th century have caused the andesitic volcano to be referred to as the "Lighthouse of the western Pacific." The symmetrical, sparsely vegetated summit is the central cone within a small caldera cutting an older edifice, remnants of which are seen on the SE and southern sides near the coast. Flank fissures have fed lava flows during historical time that form platforms along the coast. Both summit and flank vents have been active during historical time. Eruptions have also been observed from nearby submarine vents, and Makhahnas seamount, which rises to within 640 m of the sea surface, lies about 10 km to the SW.

Information Contacts: N. Banks, HVO.