Physics connects seismic data to properties of rocks and sediments. A new analysis of seismic data from NASA’s Mars InSight mission has uncovered a couple of big surprises. The first surprise: the top 300 meters (1000 feet) of the subsurface beneath the landing site near the Martian equator cont
An artist illustration of the InSight lander on Mars. InSight, short for Interior Exploration using Seismic Investigations, Geodesy and Heat Transport, is designed to give the Red Planet its first thorough check-up since it formed 4.5 billion years ago. Credit: NASA/JPL-CaltechA new analysis of seismic data fromThe first surprise: the top 300 meters of the subsurface beneath the landing site near the Martian equator contains little or no ice.’ crust is weak and porous.
Water may also go into minerals that do not act as cement. However, the uncemented subsurface removes one way to preserve a record of life or biological activity, Wright said. Cements by their very nature hold rocks and sediments together, protecting them from destructive erosion. “As scientists, we’re now confronted with the best data, the best observations. And our models predicted that there should still be frozen ground at that latitude with aquifers underneath,” said Manga, professor and chair of Earth and planetary science at UC Berkeley.on Elysium Planitia, a flat, smooth, plain near the Martian equator. Its instruments included a seismometer that measures vibrations caused by marsquakes and crashing meteorites.
“We ran our models 10,000 times each to get the uncertainties incorporated into our answers,” said co-author Richard Kilburn, a graduate student working in the Scripps Tectonorockphysics Lab led by Wright. Simulations showing a subsurface consisting mostly of uncemented material best fit the data.
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