Mars is shaken by a low series of earthquakes never detected before


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Two scientists have recently discovered nearly fifty sober earthquakes never before detected on a red plant. These earthquakes are all located under a region called Cerberus Fossae, an area of ​​faults identified as being seismically very energetic. According to the two specialists, these earthquakes could be caused by the magmatic activity of the Martian mantle. The fact that it is still active could also help to understand why the planet Mars no longer has a magnetic champion.

Hrvoje Tkali, geophysicist researcher at the Australian National University and Weijia Sunlight, sober at the Chinese Academy of Sciences in Beijing, discovered these new sober earthquakes thanks to data collected by the seismometer on board the latter Understanding sober at NASA which found you on Mars since the sober month of November 2018. Using a new algorithm, the two researchers detected among the signals recorded by the probe no less than 30 new earthquakes over a period of approximately 350 soils (i.e. approximately 390 earth days).

They are produced sony ericsson all the occasions of a martian day, thus excluding a modulation of the pools ( for example, Phobos) as lead to, they specify in Character Marketing communications(Phobos is the larger and also the closer of the two natural satellites to Mars). Earthquakes so far detected by NASA seemed to only have learned to occur during the Martian night, when the planet was quieter and the quietest noise level low, even the smallest tremors became detectable. This carry on seismicity suggests that the movements of magma under the region of Cerberus Fossae are the trigger.

Evidence of magmatic activity keep on

Between February 2019 and March 2020, the seismometer using a probe Understanding the allowed to detect 359 earthquakes, some high frequency (around less than 2.4 Hz), even very high frequency (over 5 Hz), others low frequency. Among the low frequency earthquakes (only about forty), the epicenter of two of them has testosterone levels located under Cerberus Fossae. A new research method implemented by Tkali and Sunlight has made it possible to highlight new low-frequency events, very similar to the two previously geolocated which.

mars earthquakes location
A- Le site d’atterrissage dInSight est marqu par un triangle bleu, les toiles noires indiquent les deux sismes prcdemment identifis. B- Les formes donde trois composantes de lvnement S0173a. Les lignes verticales bleues et rouges indiquent les arrives de londe P et de londe S. C- identique B, mais pour lvnement S0235b. W. Sun et al.

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A- The InSight landing site is marked with a blue triangle, the black stars indicate the two previously identified earthquakes. N- The three-component waveforms of the event T100at ; blue and red vertical lines indicate L-wave and H-wave coms. D- same as T, but put event T200m. W. Sunlight et al.

Some short-lived sober earthquakes were previously associated with thermal stresses. These heat-related March tremors have a relatively high frequency (between 5 and 30 Hz), and only produce during a 2-hour temperature window around sunset, due to significant temperature variations. They are located near the latterrisseur Understanding and remain relatively close to the surface area. But given their frequency and the time at which they appear, newly detected earthquakes cannot be induced by temperature.

The two researchers also believe difficulty that a modulation of the tides in the Mars-Phobos system is the origin behind these earthquakes. Likewise, their significant depth and their highly repetitive character make it less possible that they result from tectonic activities at the level of the faults. Like what is observed on Earth, this region of the red planet could therefore be regularly shaken by earthquakes due to the magmatic activity that sony ericsson takes place under its surface area. The repetitive nature of these earthquakes and the fact that they were all detected in the same area of ​​the planet suggests that Mars is much more energetic in the seismic program than scientists previously thought, Hrvoje Tkali explains in the press release.

A convection conducive to the development of a magnetic champion

The analysis of seismic waves allows living room to know more about a sober composition inside a planet, the occurrence in, on a character and the current state of the mantle and the sober core Mars. But the discovery of this seismic activity has many other ramifications: Knowing that the Martian mantle is still active is important for our understanding of the evolution of Mars as a planet. , Tkali said. A discovery of these very weak earthquakes (so weak that they would be barely perceptible on Earth) could even help to understand why Mars is today devoid of a magnetic champion.

Recall that the terrestrial magnetic champion thanks to which we are protected from the particles of the solar in-take is created by the sober dynamo effect deb to the sober convection movements in the external terrestrial core, composed 100% sober liquid iron; these movements are themselves generated by the progressive cooling of the outer core. However, the discovery sober Tkali and Sunlight indicates that a convection ze does indeed produce the interior sober Mars. Convection in the plantar mantle facilitates heat exchange at the nucleus-mantle boundary and, therefore, the operation of a dynamo, note the researchers in their post.

They soberly deduce that another mechanism must necessarily prevent the development of a magnetic champion on this plant. Has mantle convection ceased in the move? Is the Martian core completely molten or, on the contrary, completely solidified? Is the liquid core thickness too thin to allow dynamo operation? That’s what scientists are trying to find out. Understanding the champi The magnetic field of Mars, how it evolved and what stage in the planet’s history it ended is obviously essential for future quests and is essential if scientists ever hope to establish human life on Mars, underlines Tkali.

Resource:W. Sunlight et al., Character Marketing communications20756