Uplift and rotation of crustal blocks may be a common mountain-building process on Io. Haemus Montes is seen in the background. Iopolis Planum is in the foreground. Vertical exaggeration is 4 times normal. This sketch illustrates Schenk and Bulmer's idea that a thrust fault would be exposed along the southwest flank of Euboea Montes and dip steeply to the northwest beneath the mountain.
Arrows show direction of movement.
Layers of lava tilt slightly upward under the northern flank of the mountain. H igh-resolution images of Io planned by the Galileo mission in 1999 should reveal more details and help to test Schenk and Bulmer's conclusions. Full description of Galileo image of Io used in this article's headline from the NASA Planetary Photojournal. Io images including 3-D, and a movie, from the Lunar and Planetary Institute. Io image archive from the Galileo mission.