Determining marsquake magnitudes is essential for assessing seismic activity on Mars, yet previous estimates neglect three‐dimensional (3D) scattering effects. The exceptionally long‐lasting coda of the largest recorded marsquake, S1222a, provides a unique opportunity to quantify how crustal heterogeneities affect waveform propagation and magnitude estimation. Here, we perform full 3D waveform simulations for S1222a, incorporating surface topography, lateral crustal thickness variations, and heterogeneous random media. By fitting waveform envelopes in the 0.04–0.08 Hz frequency band, crustal heterogeneities with 20–50 km correlation lengths and 30%–40% maximum velocity perturbations are required to reproduce the observed long‐period scattered surface waves. Accounting for these 3D scattering effects increases the estimated moment magnitude of S1222a to 4.7–4.9, higher than one‐dimensional (1D) estimates and consistent with normal mode observations. Our results demonstrate that neglecting 3D scattering can systematically underestimate marsquake magnitudes by 0.2–0.3, biasing estimates of seismic energy release on Mars.
Reliable estimates of seismic source size on Mars are critical for interpreting tectonic activity and impact processes, constraining the planet's interior evolution, and informing the design of future Martian seismic experiments. However, because InSight observations are limited to a single station, magnitude estimates...
Jung-Hun Song, Doyeon Kim, G. S. Collins et al.· Journal of Geophysical Resea...· 0 citations
Seismic attenuation in lunar lower mantle can provide critical constraints on thermal state and composition of the deep interior; however, previous estimates based on path-integrated amplitudes are strongly influenced by near-surface scattering, especially for narrow-band waveforms recorded by Apollo’s sparse seismic...
Seismic radiated energy is fundamental to earthquake physics, yet its scaling remains debated. Two conflicting views—magnitude‐invariant apparent stress and systematically increasing apparent stress—have persisted partly because source spectral estimates are poorly constrained. Poorly constrained source spectra also cr...
S. Shimmoto, F. Cotton· Geophysical Research Letters· 0 citations
Seismic attenuation is a key indicator of crustal heterogeneity and energy dissipation, yet the physical mechanism of coda‐wave attenuation remains unclear due to the combined influence of scattering and intrinsic absorption. In this study, we analyze multi‐frequency S‐wave coda attenuation using the seismic recordings...
Yu-Tong Liang, Wei Wang, Juan Li et al.· Journal of Geophysical Resea...· 0 citations
Using a numerical modeling scheme, we evaluate the azimuthal source-to-site dependence of the horizontal-to-vertical spectral ratio (HVSR) by comparing wavefields propagated through a horizontally layered velocity structure and more complex velocity structures. We choose the best combination of the radial, tangential...
Camilo I. Pinilla-Ramos, D. Dreger, A. Pitarka et al.· Bulletin of The Seismologica...· 0 citations
We introduce a new 1D model of shear attenuation in the mantle (QM1D) constructed from measurements of differential attenuation of S and ScS body waves. We build a dataset of over 90,000 measurements of $\delta t^*_{\text{ScS-S}}$ from seismograms with high-quality S and ScS waveforms from deep earthquakes between 20...
C. Martin, S. Talavera-Soza, A. Deuss· Geophysical Journal Internat...· 0 citations
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