Seismic structure across central Myanmar from joint inversion of receiver functions and Rayleigh wave dispersion

The active tectonics in Myanmar is governed by the ongoing northward indentation and obliquely-eastward subduction of India into Eurasia. So far, detailed seismic structure crust uppermost mantle at eastern flank India-Eurasia collision zone remains highly debated. With waveforms recorded 79 broadband stations Myanmar, we build a regional shear velocity model depth range 0–80 km joint inversion ambient noise derived Rayleigh wave dispersion P-wave receiver functions. Common conversion point stacking was performed along two representative profiles. We observe clear variations discontinuity structures beneath this region. 1) A sedimentary layer covers fore-arc trough Central Basin, with less than 2.5 km/s thickness increasing from ~8 22°N to ~18 23°N. Chindwin basin evidently thicker back-arc Shwebo basin, an abrupt drop sediment towards east appears immediately below Wuntho-Popa magmatic arc. 2) Crustal low-velocity (LV) anomalies (<3.3 km/s) Indo-Burma Ranges probably reflect Bengal sediments accreted toe overlying Burma plate, 3) underlying LV over 20 Moho (30–40 depth) indicative eastward Indian continental crust, top boundary which imaged dip angle ~20°. 4) Upper filling majority domain depths greater 60 display connection small-scale, subcrustal body Monywa volcano, possibly forming fluid- or melt-rich channel. • Complex under central present. Thickness contrast forearc (~8–18 km) clear. Accretionary materials possess low velocities. East-dipping subducted ~25 imaged. bodies basins imply fluids/melts accumulation.