Venus’s rift valleys likely sustain its volcanic activity, new study finds
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New research suggests that Venus’s vast rift valleys may act as conduits for internal heat, allowing the planet to remain volcanically active. Computer simulations indicate that these chasms prevent heat buildup, explaining Venus's young surface. The findings challenge previous assumptions that Venus is a geologically dead world.
The Rift Valley Landscape
Venus is scarred by a network of rift valleys stretching thousands of kilometers, including the 10,000-kilometer-long Beta-Atla-Themis zone. Unlike Earth, Venus lacks plate tectonics, yet its surface is relatively young, indicating recent volcanic resurfacing. Scientists from the University of California, Los Angeles, led by Dr. Anna Gülcher, used 3D mantle convection models to study how these rifts interact with the planet's interior. Their results, published in Nature on August 2, 2026, show that rifting allows hot mantle material to rise closer to the surface.
Heat Escape Mechanism
The models reveal that as the lithosphere stretches and thins at rift zones, heat from Venus's interior can dissipate more efficiently. This process reduces the temperature of the mantle, preventing the massive melt events that would otherwise resurface the entire planet in a catastrophic pulse. Instead, the rifts facilitate steady, widespread volcanism over billions of years. The study calculates that without rifting, Venus would experience global volcanic overturns every 500 million years, but with rifts, heat loss is continuous.
Implications for Venus's History
The findings support a steady-state model of Venus's geology, where the planet has been active throughout its history rather than in episodic bursts. This aligns with observations from ESA's Venus Express and NASA's Magellan missions, which detected signs of recent lava flows. The research also explains why Venus's surface lacks the high number of impact craters expected for a static crust. If confirmed, the rift valley mechanism could reshape theories about how rocky planets evolve without plate tectonics.
What's Next
NASA's VERITAS and ESA's EnVision missions, set for launch in the early 2030s, will map Venus's surface in high resolution, testing the rift hypothesis. It remains unclear, however, whether the process fully accounts for Venus's current heat budget or if additional mechanisms are at play.
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Venus’s rift valleys likely sustain its volcanic activity, new study finds
