It seems possible that a sinking current of cooled mantle material on the upper side of the plate might be the cause of such deep basins.
看来，板块上侧冷却的地幔物质的下沉流可能是造成这种深盆地的原因。
"There could have been a massive change in the distribution of mantle," Perron said, "which would have caused the planet to shift into its current position."
佩伦说：“地表覆盖物可能经历过大规模的变化，致使火星变成了目前的地形。”
The current inference of mantle flow is largely based on seismic tomography and anisotropic analysis.
地震波速度结构层析成像和地震各向异性分析，是推测现今地幔流动的主要观测依据。
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