Seismo Lab Seminar

Apollo seismic experiments have provided unique insights into the Moon's tectonic activity and subsurface structure. In this talk, I revisit Apollo seismic observations to investigate two complementary aspects of the lunar crust: its ongoing deformation and its near-surface heterogeneity. Stress drops of shallow moonquakes reveal diverse source characteristics and suggest multiple tectonic mechanisms associated with global contraction and crustal heterogeneity. Second, I combine thermal moonquake observations with numerical simulations to investigate a potential physical origin of lunar seismic scattering. The results favor a boulder-rich upper megaregolith beneath a thin surface regolith, shedding light on the Moon's impact-driven evolution. Together, these findings offer new perspectives on the tectonic and geological evolution of the lunar crust.