Gas measurements during the same time revealed that CO2 emissions had more than doubled (figure 16). Which is an instrument that helps to monitor volcanoes? Mt Spurr Volcano is located 130 km west of Anchorage and NE of Chakachamna Lake. The level of seismic activity at Mt. A moderate explosive eruption that began at 0704 on 27 June sent ash to about 8 km altitude. This activity consisted of increased seismicity beginning in February 2004, melting of the summit ice cap, and substantial emission rates of carbon dioxide (CO2) and sulfur dioxide (SO2). Using sensitive instruments, scientists flying around the volcano on 7 August detected small amounts of the volcanic gases in a plume from the summit. Crater Peak, Mount Spurr Volcano, Alaska  Crater Peak is a smaller cone and crater on the south side of Mount Spurr, across Cook Inlet, 125 km west of Anchorage, Alaska (61.39°N, 152.25°W). The next day seismic levels had declined to near background and no additional flowage signals were observed. The Alaska Volcano Observatory (AVO), a Cooperative Program of the U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys, has detected unrest at Mount Spurr volcano, located about 125 km west of Anchorage, Alaska, at the northeast end of the Aleutian volcanic arc. Spurr remained at Concern Color Code Yellow. Richter scale. The present Mt. No aircraft encounters with the ash cloud were reported. During those two years, hydrothermal and fumarolic activity within the ice-filled summit crater resulted in the formation of a summit ice cauldron and emplacement of debris-flow deposits on the upper slopes of Spurr. 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. Pilot reports indicated that the top of the cloud was at about 9 km altitude. August 16, 2000 TIFF The glacier-covered Redoubt Volcano is one of many that line Alaskaâs southern shores. Areas of loss of InSAR coherence are not colored. Bull Volcanol, 64: 206-218. CO2 flux had declined from nearly 10,000 t/d in late September to 2,900 t/d on 5 October, while the rate of SO2 emission had steadied at about 400 t/d. These earrings are made with ash from the 1992 Eruption of Mount Spurr in Alaska. A full cycle of colors (i.e., one interferometric fringe) represents 56 mm of LOS surface displacement. Airplane pilots reported ash NW of Regina, Saskatchewan (one layer about 600 m thick, centered at 9 km altitude, and a more intense layer to 11.5 km), near Calgary, Alberta (6.5-7.5 km), near Pierre, South Dakota (10-12.5 km), and later in the day near Mason City, Iowa (13 km), Chicago, and from Milwaukee to Windsor, Ontario (8 km). Since 2006, most of the sides and bottom of the summit crater have been covered by snow, with the exception of the fumarole field in the N part of the crater floor. Mt Spurr volcano is the highest volcano in the Aleutian Volcanic Arc. An approximately 500-m-long debris flow emanating from the ice and snow ESE of the summit melt pit was seen from Anchorage and confirmed by an overflight on 2 May. Seismicity at Spurr has been characterized by large fluctuations in the number of events. This activity followed a significant increase in August 1991, when earthquakes began to occur beneath Crater Peak, a region that had been almost quiescent since monitoring began (figures 1 and 2). Spurr remained at Concern Color Code Yellow. Spurr remained at Concern Color Code Yellow. No eruptive episodes have occurred from Spurr in the month following the explosive activity of 16-17 September. 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