Here we further improve the resolution of the AMC image by employing a 2-D time-domain elastic full waveform inversion (FWI) method. These results suggest the presence of partial melt within the lower crust (>4 km bsf). Under the ultraslow spreading environment, we have previously reported the discovery of a large lower-crustal low-velocity zone at the Southwest Indian Ridge at 50☂8'E from 3-D travel time tomography of refraction data registered by an ocean bottom seismometer (OBS) array. multichannel seismic data), showing that the depth of the top reflector increases from 1 km to ~3 km below the seafloor, when the spreading rate decreases from fast to slow spreading. They have been extensively imaged with seismic reflection data (e.g. The existence of axial magma chambers (AMC) is indicative of the magmatic crustal accretion at Mid-Ocean Ridges.
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