Spurr volcano (United States) - Smithsonian / USGS Weekly Volcanic Activity Report for 22 September-28 September 2004 (Continuing Activity)
Wed, 22 Sep 2004, 06:00 | BY: VN
Elevated seismicity continued at Spurr during 17-24 September, with an average of ten earthquakes occurring within 30 km of the summit daily. The combined output of carbon dioxide from one vent at Crater Peak and one at Spurr was approximately 2,300 tons on 15 September, an increase from the approximately 760 tons/day measured during 7-8 August. AVO reported that the gray color of the lake at the bottom of the ice cauldron is typical of crater lakes containing dissolved sulfur dioxide.These observations further suggest that magma resides beneath the volcano. However, there were no indications that an eruption is imminent, and this type of activity does not always lead to an eruption. Spurr remained at Concern Color Code Yellow.
Source: US Geological Survey Alaska Volcano Observatory (AVO)
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From: Global Volcanism Program, 2004. Report on Spurr. In: Mayberry, G (ed.), Weekly Volcanic Activity Report 22 September-28 September 2004. Smithsonian Institution and US Geological Survey.
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Wed, 15 Sep 2004, 06:00
Spurr volcano (United States) - Smithsonian / USGS Weekly Volcanic Activity Report for 15 September-21 September 2004 (Continuing Activity)
Elevated levels of seismicity continue to be recorded, but have not changed significantly from that observed in the past few weeks. During the week ending on 17 September there were about 85 earthquakes located within 30 km of the summit with an average of approximately 12 per day. Observations of the summit during AVO overflights showed no major changes. ... Read all
Wed, 8 Sep 2004, 06:00
Spurr volcano (United States) - Smithsonian / USGS Weekly Volcanic Activity Report for 8 September-14 September 2004 (Continuing Activity)
During 3-10 September, elevated levels of seismicity continued to be recorded at Spurr as has been the case for several weeks. About 90 earthquakes were recorded during the report period within 30 km of the summit, with about 13 occurring per day. Observations and photography during the week revealed that the ice pit located near the summit had enlarged substantially (currently about 150 m x 170 m), presumably as the roof of the meltwater basin continued to subside and collapse. ... Read all
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