Terrawatch: How Balloons Might One Day Detect Earthquakes in Hard-to-Reach | earthquakes

On December 14, 2021, a 7.3-magnitude earthquake struck Indonesia. The epicenter of the earthquake was below the sea floor near the island of Flores.

Within minutes, earthquake waves hit seismometers around the world as they ripple across and around the Earth.

For the first time, a network of airships, 12 miles (20 kilometers) above the Earth’s surface and 190 miles from the source, felt the earthquake’s impact via pressure waves traveling through the atmosphere.

In the case of the Flores earthquake, the balloon data didn’t particularly add to our knowledge, but scientists are excited about the technology’s potential to measure earthquakes in hard-to-reach places like Venus, whose hot, cloudy surface is eroding. The atmosphere limits our ability to monitor earthquakes there.

Three missions to Venus have been accepted in the early 2030s, and several teams are working on balloon-based seismic monitoring. “The story of our interest in Venus is that we know nothing of its interior,” said Raphael Garcia, of the University of Toulouse in France.

“We don’t know how it’s made indoors and on the ground, seismology is one of the best tools for finding out.”

The results were published in Geophysical Research Letters.

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