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Fourpeaked reported activity



Event Name : Fourpeaked 2013/4

Start:April 2013 Observed
Stop:May 2013 Observed

Fumarolic or hydrothermal activity: BibCard
Seismicity with no confirmed eruption: BibCard
Eruption Type:Not an eruption.

Description: From Dixon and others(2015): "A minor increase in seismicity at Fourpeaked Volcano in April and May prompted additional analysis of monitoring data by AVO. AVO also received a report in May of steaming near Mount Douglas and Fourpeaked. During 2013, the Aviation Color Code and Volcano Alert Level for Fourpeaked remained at GREEN/NORMAL.

"A ML=4.5 earthquake occurred just west of Fourpeaked at 06:34 UTC (22:34 AKDT) on May 12. The Alaska Earthquake Information Center (AEIC) located this earthquake 15 km (9 mi) west of Fourpeaked and 25 km (16 mi) west-southwest of Mount Douglas at 15 km (9 mi) depth. This earthquake was immediately preceded by two foreshocks. A dozen small earthquakes occurred in this region in the 3 days before the ML=4.5. Another ML=4.5 earthquake occurred near Fourpeaked at 02:33 UTC (18:33 AKDT) on May 14, about 40 hours after the first earthquake. Comparison of the initial waveforms of the earthquake on seismograph station KABU suggests that both earthquakes had the same location and similar focal mechanisms. AVO analysts located 28 earthquakes in the 2 weeks following the second mainshock. It is unknown if this series of earthquakes are volcanic, but no observations of increased volcanic activity were received.

"On May 19, a crew of Alaska Department of Fish and Game biologists reported steaming near Mount Douglas and Fourpeaked. AVO followed up on this report, noting that the lake at Mount Douglas froze over in previous years but did not freeze in 2013, which is likely the cause of the isolated report."

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Page modified: March 30, 2017 14:36
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