Masaya Volcano Latest News: Scientists at Pennsylvania State University (Penn State) have uncovered evidence of two previously unrecognized magma sources beneath Nicaragua’s active Masaya volcano, offering new insights into how molten rock moves deep underground. The discovery could improve scientists’ understanding of volcanic activity and help strengthen future eruption monitoring and hazard assessment.
The findings are particularly significant because approximately 2 million people live within 13 miles of Masaya, which is also a popular tourist destination and a national park. Researchers say understanding the volcano’s underground magma system could help identify unusual changes in its behaviour and improve preparedness for potential volcanic hazards.
The study analysed six years of satellite observations, from 2018 to 2024, revealing that different areas around the volcano were moving in opposite directions. While the broader caldera shifted from sinking to rising, the ground around the active Santiago crater continued to sink.
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Published in the journal Geophysical Research Letters, the research suggests that Masaya’s underground magma system may be more complex than previously understood. However, the findings do not establish that an eruption is imminent.
Why Is Nicaragua’s Masaya Volcano Important?
Located near Managua, Nicaragua’s capital, Masaya is an active volcano known for its persistent volcanic activity and glowing lava lake. Its geological structure includes multiple overlapping craters and calderas, which are large depressions that can form when the ground collapses following the withdrawal of magma from an underground reservoir.
Despite years of scientific observation, researchers are still working to understand how magma moves through the volcano’s underground reservoirs and connecting pathways.
Lead researcher Lizzie Johnson, who completed her undergraduate degree in geosciences at Penn State, highlighted the importance of monitoring Masaya because of the population living nearby and the volcano’s popularity among visitors.
Although Masaya last produced a major lava flow in 1772, the volcano continues to release volcanic gases, including sulfur dioxide. High concentrations of this gas can pose health and environmental risks even when a major eruption is not occurring.
Continuous monitoring is therefore important for establishing the volcano’s normal activity levels and identifying changes that could indicate increased hazards.
How Did Scientists Discover Hidden Magma Sources Beneath Masaya?
Researchers used satellite measurements collected by Sentinel-1 to track small changes in the ground surrounding Masaya over six years.
The team employed a remote-sensing technique called interferometric synthetic aperture radar (InSAR), which measures subtle changes in the distance between a satellite and the Earth’s surface. These measurements help scientists identify areas where the ground is rising, sinking or deforming.
The technique is especially useful for studying volcanoes in tropical regions, where cloud cover can limit conventional optical satellite observations. Radar can collect useful measurements even when clouds obscure the ground.
By comparing satellite observations collected at different times, researchers could identify changes in the volcano’s surface without directly accessing or observing the magma beneath it.
Young Cheol Kim, a researcher involved in the study who completed his doctorate in geosciences at Penn State, explained that long-term monitoring helps scientists establish a baseline against which changes in volcanic behaviour can be assessed.
Such observations can provide valuable information about underground processes, although surface deformation alone cannot determine precisely when or whether an eruption will occur.
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