Repetitive marsquakes in Martian upper mantle

Marsquakes excite seismic wavefield, allowing the Martian interior
structures to be probed. However, the Martian seismic data recorded
by InSight have a low signal-to-noise ratio, making the identification
of marsquakes challenging. In this research sciencists use the
Matched Filter technique and Benford’s Law to detect hitherto
undetected events. Based on nine marsquake templates, they report
47 newly detected events, >90% of which are associated with the
two high-quality events located beneath Cerberus Fossae. They
occurred at all times of the Martian day, thus excluding the tidal
modulation (e.g., Phobos) as their cause. Scientists attribute the
newly discovered, low-frequency, repetitive events to magma
movement associated with volcanic activity in the upper mantle
beneath Cerberus Fossae. The continuous seismicity suggests that
Cerberus Fossae is seismically highly active and that the Martian
mantle is mobile. Full research: https://go.nature.com/3JbDIF2