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Seguam reported activity

SEGUAM LINKS

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EVENT SPECIFIC INFORMATION

Event Name : Pyre Peak 1977/3

Start:March 6, 1977 Observed
Stop:March 8, 1977 Observed

Lava flow: BibCard BibCard
Tephrafall: BibCard BibCard
Radial fissure: BibCard BibCard
"Fire", "Glowing", or incandescence: BibCard
Eruption Type:Explosive
MaxVEI: 1 BibCard
Duration: 2 days BibCard
Othermafic

Description: From Miller and others (1998): "In early March, 1977 the crew of the U.S. Coast Guard Cutter Mellon reported eruptive activity. Eight lava fountains, up to 90 m high were noted along a radial rift about 1 km long and about 2.5 km southwest of the summit. At least two tongues of lava were extruded. The larger flow, 1 km wide, extended 1 km south. Neither tongue entered the sea. Pyroclastic material was also produced during the event. Dense clouds containing black ash and incandescent fragments were emitted from one or both of the vents effusing lava, and a coating of fine ash was visible on the surrounding snow. By March 8th, lava extrusion had apparently ceased, but a considerable amount of steam, possibly containing some ash, was still being discharged (Anchorage Times, March 8, 1977; Smithsonian Institution, 1977)." Although Miller and others (1998) cite the Anchorage Times, March 8th, as the source of the news article, the article appears in the March 7th edition.

The March 7, 1977, Anchorage Times article states: "A volcanic eruption on Seguam Island in the Aleutian Chain yesterday morning shot smoke and fire hundreds of feet into the air, a U.S. Coast Guard spokesman said this mroning.

"A Coast Guard cutter spotted the eruption shortly after 7 a.m., Anchorage Time, and radioed a report to Coast Guard headquarters in Junear.

"'Fountains' of smoke and fire were steadily being spewed 100 to 200 feet into the air from the mouth of the voclano, Captain Hal Olson, commander of the cutter Mellon, reported.

"'The flow divides into two tongues - the smaller moving southerly approximately 1/2-mile long and 1/4 mile wide, the large moving steadily about 1 1/2 miles long by 1/2 mile wide,' Olson reported.

"Two vents, or mouths, of the volcano were erupting, with lava and black smoke flowing from both.

"No earthquakes occurred from the eruption although it was reported to be one of the largest in the area, a spokesman for the Palmer Observatory said.

"Seismic stations on Adak and Nikolski Islands, located on each side of Seguam Island, did not pick up readings leading scientists to believe little or no seismic action followed the eruption.

"Seguam Island, about 160 miles east of Adak Island, is uninhabited. The island is about 15 miles long and five miles wide.

"The 37-foot cutter, normally based in Honolulu, was on fisheries patrol off the Aleutian Islands."

Jicha and Singer (2006) measure the present volume of material erupted during the 1977 eruptions as 0.06 cubic km (6x10^7 cubic m).

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