Earthquake Sensors Can Track Space Junk
Scientists have found that networks of earthquake sensors, normally used to detect ground shaking, can also track falling space debris as it reenters Earth’s atmosphere. When fragments of satellites or rocket stages fall back at high speed, they create sonic booms that these seismic sensors can pick up.
How it works
As space junk plummets toward the ground at supersonic speeds, it produces shock waves in the air. Earthquake-monitoring sensors detect the ground vibrations caused by these sonic booms, allowing researchers to estimate the trajectory, speed and breakup of the debris during descent.
Why it matters
Traditional radar and optical systems often lose track of objects once they begin to break up in the atmosphere. By using seismic data, scientists can get a better picture of where debris is heading and potentially improve predictions of where fragments might land. This could help safety and response efforts if hazardous pieces reach the surface.
Growing concern
Space debris is increasing as more satellites and rocket parts are launched. Uncontrolled reentries pose a risk to people and property on the ground, driving the need for improved monitoring methods.
