She noted that the weather for the past few days was unusually clear (figure 13). During a one-day visit on 26 December 1990, a small ash eruption was observed, feeding a cloud that rose several hundred meters above the crater rim. On that day almost 700 events occurred near Abbott Peak, a station 10 km NNE of the summit of Mt. In 1984 there was a 3-4 month period of larger and more frequent Strombolian eruptions which ejected bombs >2 km from the summit crater. The glacier-covered volcano was erupting when first sighted in 1841 and has had an active lava lake in its summit crater since late 1972.Significant collapse of the Inner Crater was occurring in late 1995, although the lava lake remained fairly constant in size at ~20 m diameter and generally in the same location.
. Erebus in the Antarctic Journal of the United States (year described: citation); 1975: v. 11, no. MEVO recorded occasional explosions propelling ash up to 2 km above the summit of this Antarctic volcano and the presence of two, sometimes three, lava lakes (figure 26). There was little change until 13 September 1984, when a significant increase in activity occurred, peaking during September and early October but remaining at significantly higher levels than the preceding 12 years until January 1985 (9:9-10 and 10:3).
It is important to note that the graph reports events of all sizes, including periods of extremely frequent and small (The older records are based on interpretation of short-period seismographs, and many of the events could have been icequakes (seismic events related to the stick and slip nature of glacial ice movement) and not eruptions.
"From 13 to 19 September, the volcano was very active with 8-19 large explosions (recorded on WWSSN, IMESS, and infrasound instruments) per day, decreasing to 2-8/day 20-25 September, then increasing again to 12-27 explosions per day 26-29 September.
The cracks, 30-100 mm wide and 1.5 m deep in many places, were traced about 200 m around the N main crater rim. Erebus.
At this time we do not have reliable magnitudes for the events, but the fact that some of them were recorded at Scott Base and Mt.
The 8 October earthquake swarm may be related to renewed magma movement (dike injection?)
Deformation studies currently in progress by NZGS personnel should give a better indication of the changes in the lava lake. Kyle P R, Dibble R R, Giggenbach W F, Keys J, 1982. . In some cases additional feature type, elevation, or location details are provided.Mount Erebus, the world's southernmost historically active volcano, overlooks the McMurdo research station on Ross Island. Erebus and roughly correlates with an area that apparently was hydrothermally active in 1908. The anorthoclase phonolite lava lake was still present and the pattern of activity was similar to that observed over the last 5 years. Since 1976 there has been no increase in the size of the lava lake; collapse of the N crater wall has probably reduced the overall size. In addition, infrequent small ash eruptions took place at a vent adjacent to the lava lake.Geologic Summary. A summit plateau at about 3,200 m altitude marks the rim of the youngest caldera, within which the modern cone was constructed. Several observed eruptions from the largest lava pool ejected a small number of bombs onto the Main Crater floor. Antarctica has been considered aseismic, but this is apparently not the case, at least not for microearthquakes with magnitudes less than 3. It filled the large steaming collapse site SW of the main lava lake, and covered the S half of the inner crater with talus and debris. Activity remained similar to that observed over the last three years. Observers suggested that it might have been a geyser.
Only small pools of lava were observed 3 years ago. Present activity was similar to that of previous years, except that the vent above the lava lake was no longer active.The inner crater floor and lava lake were being monitored by a black-and-white, heat-sensitive, mounted camera that transmits continuously to Scott Base, where data are recorded for at least 4 hours/day. SOScientists visited the summit of Mt. 5, p. 34; 1981-82: v. 17, no. The lake is oval, ~100 m long and 60 m wide, with total surface area approximately 4,500 m"Convection of the lava lake was variable, with upwelling occurring about 1/3 of the distance from both ends of the lake. "Wiesnet, D.R., and D'Aguanno, J., 1982, Thermal imagery of Mount Erebus from the NOAA-6 satellite: Antarctic Journal of the United States, v. 17, no.
The camera is expected to operate well into the Antarctic winter before the batteries fail. Card 2026 (10 December 1974) Ash eruption with gray cloud rising 300 m above summit. 154 relations. The 3,794-m-high Erebus is the largest of three major volcanoes forming the crudely triangular Ross Island. 5, p. 29-31; 1982-83: v. 18, no. It shares some similarities with both Kilauea and Mount St. Helens but also has some significant differences. They reported the continued existence of the anorthoclase phonolite lava lake first discovered in December 1972.