The curvilinear, banded nature of these ridges suggests that crustal shortening, roughly oriented north-south, is largely responsible for their formation. Such crustal shortening was unexpected by Magellan scientists, who believed that Ovda Region, a likely site of hot upwelling from the interior of Venus, should be dominated by volcanism and crustal extension.
This radar image shown here is centered approximately at 1° N, 81° E, measures 300 kilometers (190 miles) by 225 kilometers (140 miles), and was acquired by Magellan in November 1990.
Related category PLANETS AND MOONS
Source: NASA/JPL Photojournal
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