ISRO‑NASA Satellite Data Shows 60 cm Ground Shift After Venezuela Quake

When the twin tremors rattled Venezuela in late June, most of us only saw the headlines and the after‑effects on the streets of Caracas and La Guaira. What the public didn’t see, at least not at first, was how the ground itself slipped—by almost two feet—in a single, sweeping motion.

That hidden motion was uncovered by the NASA‑ISRO Synthetic Aperture Radar satellite, better known as NISAR. Engineers and geophysicists compared four radar images: two taken before the quake (June 13 and 18) and two after (June 25 and 30). The side‑looking radar, angled about 40° from straight down, can sense tiny changes in the distance between the satellite and the Earth’s surface.

Using a technique called Interferometric Synthetic Aperture Radar (InSAR), the team detected a horizontal, east‑west shift of up to 60 centimetres just south of Caracas’s international airport. “That’s why the damage in the capital and the port city of La Guaira was so extreme,” explained Eric Fielding, a geophysicist at NASA’s Jet Propulsion Laboratory.

The quakes ruptured a strike‑slip fault that lies along the boundary between the Caribbean and South American tectonic plates. The fault system includes the San Sebastián and possibly the Bocono structures, long‑standing zones where stress has been building for centuries.

What’s remarkable is how quickly the data reached disaster responders. NISAR’s Urgent Response (UR) system pushed out preliminary displacement maps within 12‑24 hours of receiving the radar passes. Those early maps were later refined with precise orbital data, giving the U.S. Geological Survey a clearer picture of how the fault slipped at depth.

That refined “finite fault” model is more than academic—it feeds directly into emergency planning, reconstruction efforts, and future hazard assessments for the region. As Fielding put it, the satellite’s eye in the sky is now an indispensable tool for understanding why certain neighborhoods suffered more than others.

In short, the NISAR data turned a mysterious, catastrophic event into something we can measure, model, and, ultimately, learn from. And that is a big step forward for both space agencies and the people living under the shaking plates of the Caribbean.