NISAR Satellite Detects Rapid Land Subsidence in Mexico City

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The joint India–US Earth observation mission, NISAR, has detected concerning levels of land subsidence in Mexico City, underscoring increasing environmental vulnerabilities in one of the world’s largest metropolitan regions. The results highlight the satellite’s high-precision ability to track subtle but significant changes on Earth’s surface.

Advanced Earth Observation Technology

Launched in July 2025, the NASA-ISRO Synthetic Aperture Radar (NISAR) satellite marks a major achievement in global space-based monitoring. Developed jointly by NASA and the Indian Space Research Organisation (ISRO), it is equipped with a dual-frequency radar system and one of the largest deployable antennas ever placed in orbit. This allows it to gather detailed surface data regardless of cloud cover, weather conditions, or vegetation.

Severe Ground Subsidence in Mexico City

Data from NISAR indicates that parts of Mexico City are sinking at rates exceeding 2 centimetres per month, largely driven by over-extraction of groundwater. The city, originally built on a former lakebed with a fragile aquifer system, has long been prone to ground sinking. Continuous urban expansion and heavy water withdrawal have intensified soil compaction, increasing risks to buildings and infrastructure.

Scientific Confirmation and Wider Impact

Early observations recorded between October 2025 and January 2026 show strong agreement with existing scientific models. NISAR’s ability to monitor ground deformation in near real time provides valuable support for urban planning, disaster preparedness, and climate resilience strategies. It is also proving useful in tracking environmental changes in regions with difficult weather conditions.

International Collaboration and Mission Value

Valued at around $1.5 billion, the NISAR mission combines NASA’s L-band radar and antenna systems with ISRO’s S-band radar and launch expertise. This partnership represents a major step forward in international space cooperation. Continuous data from the satellite is expected to play a key role in global efforts related to environmental monitoring, natural resource management, and disaster risk reduction.

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