Mars boulder falls marsquake is a fascinating discovery that relates the movement of boulders on the surface of Mars to the seismic activity under the surface. New studies have uncovered an intriguing connection between marsquakes and boulder falls on Mars. Scientists have concluded that a marsquake recorded by NASA’s InSight lander in 2019 may have caused brand-new boulder falls on Mars.
This finding is significant since Mars is not an inactive planet. It does experience occasional marsquakes, landslides, and surface movements. The study used both seismological and satellite images to come to the conclusion that a marsquake triggered these boulder falls. The researchers, in their work published in the journal Nature Geoscience in September 2026, identified the S0235b marsquake and found 27 different fresh boulder-fall ejecta clusters near its epicenter in Cerberus Fossae. They stretched for a total distance of about 2.75 km.
Scientists Just Found a Vast Magma System on Mars Hidden Deep Beneath the Surface
What Happened During the Mars Boulder Falls Marsquake Event?
The story picks up on July 25, 2019, when NASA’s InSight lander picked up the largest marsquake ever recorded and scientists just realized what it was. InSight has a Seismic Experiment for Interior Structure (SEIS), the first-ever seismometer to successfully touch down on another planet. It can sense miniscule vibrations traveling through the surface of Mars. Scientists named it as S0235b and scientists estimated its magnitude about 3.6, and thought to be caused by tectonic shifting in Mars’ crust. It came from the area of Cerberus Fossae, which has been linked to some recent Martian geology. However, when it occurred, scientists hadn’t seen any proof that it had done any shifting on the surface. But they did not have to wait long because researchers went back over old photos and saw something incredible.
Mars has been photographed several times over the past couple of years by orbiting spacecraft. This is very valuable information because scientists are able to compare images of the same areas taken at different times. For the Mars boulder falls marsquake investigation, scientists analyze many images took by NASA’s Mars Reconnaissance Orbiter and particularly observations from its extremely powerful HiRISE camera. Scientists spotted some fresh looking tracks on the northern wall of a graben in the region of Cerberus Fossae. A graben is a long, narrow depression between faults, and the walls of the graben can be very slippery, making it easy for rocky material to come loose and tumble down the slopes.
The researchers found 27 fresh boulder-fall ejecta tracks that appeared after the 2019 S0235b event. The tracks have a combined mapped length of approximately 2.75 kilometers. The location was particularly important. The place where the tracks were found was very significant. They were found in a roughly 4-kilometer area along the northern graben wall, with 96% of them clustering in a 2 km section. That’s unlikely to be a coincidence. The location and time of the new tracks become a crucial clue that supporting the idea that the Mars boulder falls marsquake event was responsible for disturbing the Martian surface.
Why Can a Marsquake Cause Boulder Falls?
The process for a Mars boulder falls marsquake event is similar to what we see here on Earth with seismic activity. Large rocks sitting on a hillside can be poised to fall for long periods of time due to cracks, changes in surrounding temperature, and erosion to the ground on which the rock sits. These forces can loosen the bonds keeping the rock in place so that it can be moved by the vibrational forces sent out by an marsquake. When the rock moves, gravity will play its role. It can move the rock down the hill or bounce it from its resting spot with enough force to leave behind a trail. Then this trail can be used to find boulder tracks because unlike on Earth, Mars does not have consistent weather and water to clean away such markings. This is useful information as it allows scientists to recreate and comprehend events on the planet that have happened below the surface.
The team performing research on the Mars boulder falls marsquake events were able to do this by analysing thousands of images. They began by estimating what ground accelerations would be necessary to set off the instability of Martian rock. Then, they compared these estimations to the measured accelerations of the ground at the approximate location of the boulder tracks. The results of these calculations showed that the ground accelerations would be sufficient to move unconsolidated rock and debris on the surface of mars.
The Evidence Linking Marsquakes to Boulder Falls
One interesting question in planetary science is if two events occurring at same time then could they related to each other. Since a boulder can fall from gradual processes such as weathering or unstable slope. So the fact is discovering new boulder tracks after a marsquake cannot show that they have been triggered by it.
To investigate this, researchers decided to compare the formation of new boulder tracks before and after the S0235b event. They looked at the new boulder tracks that fell during approximately 1.5 years after the marsquake, S0235b. After comparing they found that the rate had jumped more than 10 times higher than the average background rate. Statistical analysis even showed a probability of less than 10-4, that the formation of new boulder tracks is because of random variation. It means that the explanation of the Mars boulder falls marsquake is much stronger than a random coincidence.
Researchers also estimated the ground acceleration at the boulder sites. Their calculations resulted a possible range of peak ground accelerations between approximately 3 × 10-4 m/s2 and 10-2 m/s2. On Mars, such accelerations would be enough to disturb and trigger rock falls on unstable slopes.
Why Cerberus Fossae Is So Important?
The Mars boulder falls marsquake discovery was a significant find because the boulder falls were discovered in Cerberus Fossae. It is one of the most seismically active areas on Mars. Cerberus Fossae is a region of Mars characterized by large scale fissures and elongated depressions. It has been the site of recent tectonic and volcanic activity, making it a region of particular interest to seismologists. The region has also an escarpment-studded surface which proved to be ideal for detecting seismic induced rock falls. The researchers were surprised to find 27 fresh rock fall tracks were actually concentrated in one area. In fact, about 96 percent of the identified tracks were found along one narrow section of the northern wall of the graben. This concentration was too large to have occurred randomly, as the probability for such an event would be minuscule. The pattern suggests that the tracks were formed by a single process, which could only happen if they were located close to the source of a marsquake. That theory became even more suspecting when the majority of the tracks were found near the epicenter of the S0235b marsquake.
This spatial pattern provides another important clue supporting the Mars boulder falls marsquake connection.
Mars Has More Than One Way to Move Rocks
Marsquakes are not the only things that can move rocks on Mars. Impacts from meteorites can also launch material on the surface and push around nearby boulders. Temperature fluctuations, surface weathering, and slope slides may also contribute in the movement of rocks. Therefore, researchers should look closely at each boulder-fall track. The shape of the track can give us information about how the boulder moved. The boulder could roll or bounce down the track and leave a trail of disturbance behind it. Scientists look at the direction, length, location, and even appearance of the tracks to determine how the rock moved. That’s why the timing and location of the tracks is so important for the Mars boulder falls Marsquake study.
The researchers were not just looking at random rocks that had rolled down a slope. They were looking for something that correlated to the timing and location of a marsquake.
What NASA’s InSight Lander Taught Us About Mars?
Mars boulder falls marsquake discovery would not have been possible without NASA’s InSight mission. InSight spacecraft landed on Red Planet in November 2018. Its main objective was to understand what goes on Mars’ interior. For example, the SEIS instrument detected vibrational waves which travelled through the planet, and using this information, scientists were able to identify and analyze different marsquakes. The first possible marsquake was detected in April 2019, just a few months after InSight touched down on Mars.
During the entire mission, over a thousand seismic disturbances were spotted by InSight. Some marsquakes were simply small and hard to pinpoint, while others provided valuable information about the geology of the planet. The mission was officially ended in December 2022 due to dust covering the solar panels of the spacecraft, which prevented the solar panels from generating enough electricity. However, InSight’s seismic data continues to be analyzed. The Mars boulder falls marsquake is a fine example of how planetary science often involves long periods of time. By looking at old seismic readings alongside more recent pictures taken by spacecraft orbiting Mars, researchers were able to find new information which was not available to them in the early 90s.
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Conclusion
The Mars boulder falls marsquake discovery provide us the secrets of the Red Planet.
A marsquake in 2019 could have created 27 new boulder tracks on Mars’ Cerberus Fossae. With the timing, location, increased frequency of rock falls and estimated ground motion all support the idea that seismic shaking played a major role. Most importantly, the discovery proves that Mars is not a completely dead planet. While much of its surface appears to be barren but it still supports geological processes beneath the surface. Some vibration deep inside the planet has the potential to result a rockfall on the surface, leaving behind a trail. That disturbance would still be visible to a satellite years later. Each new boulder track could reveal just a bit more about the interior of Mars.