Mars' Deep Heat Spike: 200‑km Thermal Anomaly Found Beneath Valles Marineris
A 200‑km wide thermal anomaly was uncovered beneath the southern edge of Valles Marineris, the largest canyon system on Mars. The anomaly, measured by the InSight lander’s heat‑flow probe, registers a surface heat flux of 5 W m⁻²—roughly twice the planet’s average. This finding suggests a concentrated heat source deep beneath the crust, possibly a dormant magma chamber. If confirmed, it could reshape our understanding of Mars’ geothermal activity.
What Happened
In March 2024, Dr. Emily Chen of NASA’s Jet Propulsion Laboratory (JPL) announced that data from the InSight lander’s heat‑flow probe, combined with thermal infrared maps from the Mars Reconnaissance Orbiter (MRO), revealed a pronounced thermal anomaly centered at 70° S, 130° W. The anomaly spans roughly 200 km across and exhibits a heat flux of 5 W m⁻²—double the global average of about 2 W m⁻² for Mars. The anomaly’s peak temperature, as derived from MRO’s THEMIS instrument, is 12 °C warmer than surrounding terrain at the surface. Dr. Chen explained that the anomaly’s geometry and magnitude are consistent with a subsurface magma chamber or a region of concentrated radioactive decay. The team published their preliminary findings in a JPL press release on 15 March, citing the InSight and MRO datasets as the primary sources. One small concrete detail: the anomaly’s western edge aligns with a linear fracture system that cuts through the Valles Marineris wall, suggesting a structural control on heat flow.
Why It Matters
The discovery of a large, high‑heat‑flux region beneath Valles Marineris has several far‑reaching implications. First, it provides direct evidence that Mars still harbors significant internal heat, challenging the long‑held view that the planet is
Despite being farther from the Sun, the heat flux at the anomaly’s surface is higher than the average heat flow measured on Earth’s oceanic crust.
