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SCIENCE & TECHNOLOGY - May 2026

May 2026

May 01, 2026

NISAR detects rapid subsidence in Mexico City from space

The NISAR mission, a joint NASA‑ISRO Earth observation project launched in July 2025, has detected rapid land subsidence in Mexico City. Data show sinking rates exceeding 2 centimetres per month in some districts, driven mainly by groundwater extraction. NISAR carries a dual‑frequency radar system and one of the largest antennas in space, enabling high‑resolution mapping under cloud cover. The observations help explain infrastructure and housing risks on an ancient lakebed and guide water‑management planning. The findings underscore the value of space surveillance for megacities and long‑term urban resilience.
  • NISAR launched July 2025
  • Subsidence in Mexico City >2 cm/month
  • Cause: groundwater extraction on ancient lakebed
  • Dual‑frequency SAR; large space antenna
  • Implications for infrastructure and water management
  • Demonstrates space‑based monitoring utility

HF radar to boost Karaikal coastal monitoring

India’s National Institute of Ocean Technology will enhance coastal surveillance in Karaikal, Puducherry, by installing a high‑frequency radar system. Two shortlisted sites are Kilinjalmedu and Akkempettai. The HF radar will monitor surface currents, waves, wind pressure, and temperature gradients up to 200 kilometres offshore and detect weather events within 80–100 kilometres. It will integrate with an existing radar in Cuddalore, improving data resolution for scientific and operational use. The project expands India’s coastal observation network and supports early warning systems for cyclones and other extreme events.
  • HF radar installation planned for Karaikal
  • Sites: Kilinjalmedu, Akkempettai
  • Measures currents, waves, wind, temperature up to 200 km
  • Detection radius 80–100 km for weather events
  • Integration with Cuddalore radar
  • Enhances coastal monitoring and early warnings
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