Today’s Image of the Day is the answer to the October 2022 puzzler.
Mount Terror might sound like a place to avoid. But this Antarctic volcano is not as terrifying as its name implies.
From a geological perspective, the mountain itself is relatively benign. It is a shield volcano located on the eastern side of Ross Island and consists of numerous pyroclastic cones and lava domes. But the volcano is now extinct. The last known eruption occurred in the Pleistocene, and the mountain’s youngest igneous rocks are almost 1 million years old. In contrast, the neighboring Mount Erebus—thought to be the southernmost active volcano in the world—contains a churning lava lake within its caldera.
The scale of Mount Terror, standing 3,262 meters (10,702 feet) above sea level, might be daunting to some people. The profile above depicts the mountain’s surface elevation along a path near its peak. Data for the elevation profile were acquired on June 17, 2021, with the Advanced Topographic Laser Altimeter System (ATLAS) on NASA’s Ice, Cloud, and land Elevation Satellite-2 (ICESat-2).
Notice that the left side of the profile (south of the island) is slightly higher than the right side (north of the island). This is because the Ross Ice Shelf stands higher above the sea surface than the sea ice. For reference, the satellite’s orbital path is laid over a natural-color image acquired on November 8, 2021, by the Operational Land Imager-2 (OLI-2) on Landsat 9.
But Mount Terror is not tall enough to deter people from climbing its peak and skiing its slopes. Even Mount Erebus, the taller of the two peaks at 3,794 meters (12,448 feet) above sea level, attracts a fair number of climbers. From afar, the island’s two tallest volcanoes provide a scenic backdrop for scientists working at McMurdo Station and Scott Base on the island’s southern tip.
Mount Terror’s name is unrelated to any of its physical attributes. Instead, it was named in 1841 by Sir James Clark Ross after his ship, the HMS Terror. Both the HMS Terror and HMS Erebus were part of numerous polar voyages, including three expeditions into Antarctic waters between 1840 and 1843.
NASA Earth Observatory images by Joshua Stevens, using Landsat data from the U.S. Geological Survey and ICESat-2 data from the National Snow & Ice Center. Story by Kathryn Hansen.
