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Is there liquid water on Mars today? Marsquake data could tell us

June 22, 2024
in Science
Is there liquid water on Mars today? Marsquake data could tell us
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View of the Mars horizon with parts of the Insight lander in the foreground

One of the last images ever taken by NASA’s InSight Mars lander shows its seismometer on the red planet’s surface in 2022. A team of scientists suggest that using data from the seismometer and a magnetometer on the lander could help reveal whether liquid water is present deep under the Martian surface.
(Image credit: NASA/JPL-Caltech)

Mars was likely, very long ago, blue from oceans of water that covered its surface. 

But the now-red world may still hold liquid water underground, stowed deep and out of sight. If there is water down there, how would we find it?

A few scientists believe that they have an answer: marsquakes. 

When the seismic waves from tremors pass through different materials, like surrounding rocks or water, they create subtle electromagnetic fields. Some scientists believe they may be able to find buried liquid water by studying seismic and magnetic readings to reconstruct the aftermath of Mars temblors.

Related: Water on Mars: Exploration and evidence

“If we listen to the marsquakes that are moving through the subsurface, if they pass through water, they’ll create these wonderful, unique signals,” said Nolan Roth, a graduate student at Penn State University and one of the researchers, in a statement. “These signals would be diagnostic of current, modern-day water on Mars.”

This technique is known as the seismoelectrical method. It isn’t entirely new; although highly experimental, geologists are testing it here on Earth to find underground fluids. But on Earth, using the method for finding groundwater is difficult — any signals from a sizable aquifer get muddled by the other moisture beneath ground.

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The researchers, however, have reason to believe the method will prove more fruitful on Mars, where any layers of rock and dust above the groundwater are liable to be bone-dry.

“In contrast to how seismoelectric signals often appear on Earth, Mars’ surface naturally removes the noise and exposes useful data that allows us to characterize several aquifer properties,” said Tieyuan Zhu, a geophysicist at Penn State and another of the researchers, in the same statement.

The next steps, the researchers say, will be to seek traces of Martian groundwater in measurements that already exist. NASA’s Mars InSight lander — which hunted for marsquakes from late 2018 to late 2022 — included both a seismometer and a magnetometer. By combining these two sources of data, the researchers may be able to put their method to the test.

The researchers published their work in the journal JGR Planets on May 5.

Join our Space Forums to keep talking space on the latest missions, night sky and more! And if you have a news tip, correction or comment, let us know at: [email protected].

Rahul Rao is a graduate of New York University’s SHERP and a freelance science writer, regularly covering physics, space, and infrastructure. His work has appeared in Gizmodo, Popular Science, Inverse, IEEE Spectrum, and Continuum. He enjoys riding trains for fun, and he has seen every surviving episode of Doctor Who. He holds a masters degree in science writing from New York University’s Science, Health and Environmental Reporting Program (SHERP) and earned a bachelors degree from Vanderbilt University, where he studied English and physics. 

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