Seismic scattering and absorption properties of Mars estimated through
coda analysis on a long-period surface wave of S1222a marsquake
Abstract
On May 4th 2022, the seismometer on Mars observed the largest marsquake
(S1222a) during its operation. One of the most specific features of
S1222a is the long event duration lasting more than 8 hours from the
occurrence, in addition to the clear appearance of body and surface
waves. As demonstrated on Earth, by modeling a long-lasting and
scattered surface wave with the radiative transfer theory, we estimated
the scattering and intrinsic quality factors of Mars (Qs and Qi). This
study especially focused on the frequency range between 0.05 - 0.09 Hz,
where Qs and Qi have not been constrained yet. Our results revealed that
Qi = 1000 - 1500 and Qs = 30 - 500. By summarizing the Martian Qi and Qs
estimated so far and by comparing them with those of other celestial
bodies, we found that, overall, the Martian scattering and absorption
properties showed Earth-like values.