Animation showing an artists rendition of Mars interior structure. Credit: NASA/JPL-Caltech
NASAs Mars Interior Exploration using Seismic Investigations, Geodesy and Heat Transport (InSight) launched in May 2018 and safely landed on the Martian surface in November of that same year. Its two-year mission was to study the deep interior of Mars to learn how celestial bodies with rocky surfaces, such as the Earth and the Moon, formed. It recently recorded a record-setting, monster quake on Mars, but sadly, it is almost lights out for InSight.
One of InSights key tools for that mission is Seismic Experiment for Interior Structure (SEIS). This round, dome-shaped instrument takes the pulse or seismic vibrations of Mars. Using data from SEIS, scientists have made a new discovery about marsquakes.
Volcanic activity beneath the surface of Mars could be responsible for triggering repetitive marsquakes, which are similar to earthquakes, in a specific region of the Red Planet, scientists from The Australian National University (ANU) suggest.
New research published in Nature Communications shows scientists from ANU and the Chinese Academy of Sciences in Beijing have discovered 47 previously undetected marsquakes beneath the Martian crust in an area called Cerberus Fossae a seismically active region on Mars that is less than 20 million years old.
It can help us answer fundamental questions about the solar system and the state of Mars core, mantle and the evolution of its currently lacking magnetic field.
The authors of the study speculate that magma activity in the Martian mantle, which is the inner layer of Mars sandwiched between the crust and the core, is the cause of these newly detected marsquakes.
The findings suggest magma in the Martian mantle is still active and is responsible for the volcanic marsquakes, contrary to past beliefs held by scientists that these events are caused by Martian tectonic forces.
According to geophysicist and co-author Professor Hrvoje Tkalcic, from the ANU Research School of Earth Sciences, the repetitive nature of these quakes and the fact they were all detected in the same area of the planet suggests Mars is more seismically active than scientists previously thought.
We found that these marsquakes repeatedly occurred at all times of the Martian day, whereas marsquakes detected and reported by NASA in the past appeared to have occurred only during the dead of night when the planet is quieter, Professor Tkalcic said.
Therefore, we can assume that the movement of molten rock in the Martian mantle is the trigger for these 47 newly detected marsquakes beneath the Cerberus Fossae region.
Professor Tkalcic said the continuous seismicity suggests the Cerberus Fossae region on Mars is seismically highly active.
Knowing that the Martian mantle is still active is crucial to our understanding of how Mars evolved as a planet, he said.
It can help us answer fundamental questions about the solar system and the state of Mars core, mantle and the evolution of its currently-lacking magnetic field.
The researchers used data collected from a seismometer attached to NASAs InSight lander, which has been collecting data about marsquakes, Martian weather, and the planets interior since landing on Mars in 2018.
Using a unique algorithm, the researchers were able to apply their techniques to the NASA data to detect the 47 previously undiscovered marsquakes.
The study authors say while the quakes would have caused some shaking on Mars, the seismic events were relatively small in magnitude and would barely be felt if they had occurred on Earth. The quakes were detected over a period of about 350 sols a term used to refer to one solar day on Mars which is equivalent to about 359 days on Earth.
According to Professor Tkalcic, the marsquake findings could help scientists figure out why the Red Planet no longer has a magnetic field.
The marsquakes indirectly help us understand whether convection is occurring inside of the planets interior, and if this convection is happening, which it looks like it is based off our findings, then there must be another mechanism at play that is preventing a magnetic field from developing on Mars, he said.
All life on Earth is possible because of the Earths magnetic field and its ability to shield us from cosmic radiation, so without a magnetic field life as we know it simply wouldnt be possible.
Therefore, understanding Mars magnetic field, how it evolved, and at which stage of the planets history it stopped is obviously important for future missions and is critical if scientists one day hope to establish human life on Mars.
Reference: Repetitive marsquakes in Martian upper mantle by Weijia Sun and Hrvoje Tkalcic, 30 March 2022, Nature Communications.DOI: 10.1038/s41467-022-29329-x
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