Marsquakes offer detailed look at red planet's interior

CAPE CANAVERAL, Fla. (AP) — A quake-measuring device on Mars is providing the first detailed look at the red planet's interior, revealing a surprisingly thin crust and a hot molten core beneath the frigid surface.

In a series of articles published this week, scientists reported that the Martian crust is within the thickness range of Earth’s. The Martian mantle between the crust and core is roughly half as thick as Earth's. And the Martian core is on the high side of what scientists anticipated, although smaller than the core of our own nearly twice-as-big planet.

These new studies confirm that the Martian core is molten. But more research is needed to know whether Mars has a solid inner core like Earth's, surrounded by a molten outer core, according to the international research teams.

Stronger marsquakes could help identify any multiple core layers, scientists said Friday.

The findings are based on about 35 marsquakes registered by a French seismometer on NASA’s InSight stationary lander, which arrived at Mars in 2018. The domed seismometer has actually detected 733 marsquakes so far, but the 35 with magnitudes from 3.0 to 4.0 served as the basis for these studies. Most of the sizable quakes originated in a volcanic region 1,000 miles (1,600 kilometers) away where lava may have flowed just millions of years ago.

Mark Panning of NASA's Jet Propulsion Laboratory, who took part in the crust study, said even the biggest marsquakes are so weak they would barely be felt on Earth. He's hoping for “the big one” which would make it easier to process the data and define the Martian interior.

“Fingers crossed, we would love to see some bigger events,” Panning said.

Current measurements show Mars' crust possibly reaching as deep as 12 miles to 23 miles (20 kilometers to 37...