Report on Wolf (Ecuador) — 19 January-25 January 2022
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
19 January-25 January 2022
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2022. Report on Wolf (Ecuador). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 19 January-25 January 2022. Smithsonian Institution and US Geological Survey.
0.02°N, 91.35°W; summit elev. 1710 m
All times are local (unless otherwise noted)
IG reported that the eruption at Wolf continued during 18-25 January. Daily thermal alerts counts were in the hundreds, centered over the advancing lava flows on the SE flank. Diffuse gas emissions were visible drifting SW during 18-20 January. Activity levels were stable during the beginning of the week then began to trend downward by 21 January.
Geological Summary. Wolf, the highest volcano of the Galápagos Islands, straddles the equator at the north end of the archipelago's largest island, Isabela. The 1710-m-high edifice has steeper slopes than most other Isabela volcanoes, reaching angles up to 35 degrees. A 6 x 7 km caldera, at 700 m one of the deepest of the Galápagos Islands, is located at the summit. A prominent bench on the west side of the caldera rises 450 above the caldera floor, much of which is covered by a lava flow erupted in 1982. Radial fissures concentrated along diffuse rift zones extend down the north, NW, and SE flanks, and submarine vents lie beyond the north and NW fissures. Similar unvegetated flows originating from a circumferential chain of spatter and scoria cones on the eastern caldera rim drape the forested flanks to the sea. The proportion of aa lava flows at Volcán Wolf exceeds that of other Galápagos volcanoes. An eruption in in 1797 was the first documented historical eruption in the Galápagos Islands.