NASA InSight Data Reveals Complex Magma Systems Beneath Mars Similar to Earth’s

A recent study published in Nature Astronomy reveals that Mars harbors complex subsurface magma systems resembling those on Earth, despite lacking active plate tectonics. Researchers analyzed seismic data collected by NASA’s InSight lander, which operated on Mars from 2018 to 2022, focusing on a mysterious boundary about 24 kilometers beneath the surface. Using thermodynamic models and advanced statistical analysis, they identified distinct rock layers: a mafic layer rich in silica above and an ultramafic layer rich in iron and magnesium below. This stratification suggests a process called trans-crustal magmatism, where liquid magma cools and separates heavier materials downward and lighter materials upward, a mechanism previously thought to require plate tectonics.

Dr. Tobermory McKay-Champion, lead author, explained that Mars has developed large, stable magma systems with prolonged material processing, challenging the assumption that Martian volcanism is simpler than Earth's. The findings imply that complex geological systems can form without plate tectonics, potentially broadening the criteria for planetary habitability. Professor John Waid from Oxford University, a co-author, suggested that geological complexity may not depend solely on planetary size or tectonic activity as previously believed.

This research builds on other InSight discoveries, including 2025 evidence of possible liquid water deep within Mars’s crust. Although InSight’s mission has ended, its data continues to provide new insights into Mars’s internal structure and geological processes, reshaping our understanding of planetary evolution and habitability beyond Earth.