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. Here we use the Matched Filter technique and Benford’s Law to detec...

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Bibliographic Details
Published in:Nature communications 2022-03, Vol.13 (1), p.1695-1695, Article 1695
Main Authors: Sun, Weijia, Tkalčić, Hrvoje
Format: Article
Language:English
Subjects:
639/33/445/508
704/445/210
704/445/508
Algorithms
Earthquakes
Geophysics
Heat transfer
Humanities and Social Sciences
Magma
Magnetic fields
Mars
Matched filters
multidisciplinary
Phobos
Planetary interiors
Planetary mantles
Science
Science (multidisciplinary)
Seismicity
Signal to noise ratio
Upper mantle
Volcanic activity
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Summary: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. Here we use the Matched Filter technique and Benford’s Law to detect hitherto undetected events. Based on nine marsquake templates, we 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. We 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. The authors detect 47 hitherto unreported low-frequency marsquakes originating from Cerberus Fossae at all times of the Martian day. The matched filter technique confirms repetitive events implying that the Martian mantle is dynamically active.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-022-29329-x