Report on Waesche (Antarctica) — March 1990
Bulletin of the Global Volcanism Network, vol. 15, no. 3 (March 1990)
Managing Editor: Lindsay McClelland.
Waesche (Antarctica) No signs of recent activity
Please cite this report as:
Global Volcanism Program, 1990. Report on Waesche (Antarctica) (McClelland, L., ed.). Bulletin of the Global Volcanism Network, 15:3. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN199003-390024
77.17°S, 126.88°W; summit elev. 3292 m
All times are local (unless otherwise noted)
January 1990 fieldwork revealed no fumarolic ice towers or other signs of recent activity. A thick (<=4 m) sequence of tephra was found in blue ice at the foot of the volcano, but its vertical attitude suggested eruptions thousands of years ago.
Geological Summary. Mount Waesche is the southernmost of a N-S-trending chain of volcanoes in central Marie Byrd Land. It is located 20 km SW of Pliocene Mount Sidley, Antarctica's highest volcano, and was constructed on the SE rim of the 10-km-wide Chang Peak caldera. Pre-caldera Chang Peak lavas were erupted about 1.6 million years ago (Ma) and the Waesche shield formed about 1.0 Ma. Waesche may have been active during the Holocene and is a possible source of ash layers in the Byrd Station ice core that were deposited during the past 30,000 years. The youngest lavas are too young to date by Potassium-Argon. Satellitic cinder cones, some aligned along radial fissures, are located on the SW flank.
Information Contacts: P. Kyle and W. McIntosh, New Mexico Institute of Mining and Technology; R. Dibble, Victoria Univ.