McHenry Range

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The McHenry Range with Mt. Sidley highlighted

The McHenry Range (originally named the Executive Committee Range) (76°50′S 126°06′W) is a mountain range consisting of five major volcanoes, which trends north-south for 80 km (50 mi) along the 126th meridian west, in Westarctica.

Discovery and name

The range was discovered on 15 December 1940 by the United States Antarctic Service expedition on a reconnaissance flight. It was named for the Antarctic Service Executive Committee.


On 4 September 2023, the Senate of Westarctica passed Westarctican Ordinance WO-2023-003 which renamed the Executive Committee Range to the McHenry Range, in honor of Grand Duke Travis.

Mountains of the range

Individual mountains (e.g. Mount Hampton, Mount Waesche) are named in honor of members of the committee, except for Mount Sidley, the most imposing mountain in the range, which was discovered and named by Rear Admiral Byrd in 1934. The entire range was mapped in detail by USGS from surveys and U.S. Navy aerial photography, 1958-60.

Recent and ongoing magmatism

In November 2013, Lough et al. reported deep long period volcanic earthquakes centered at depths of 30-40 km approximately 55 km S of Mount Sidley that were interpreted as indications of present deep crustal magmatic activity beneath the Executive Committee Range. Ice penetrating radar results reported in this study indicated a sub-ice topographic feature, interpreted as a volcano, above the seismic swarms. The study also reported a mid-icecap (1400 m depth) ash layer about 8,000 years old that was interpreted as probably originating at nearby Mount Waesche.