Abstract
The thinning of the ice sheet in the Mizuho Plateau observed by the Japanese Antarctic Research Expedition was considered using a equation of mass continuity. It led us to the conclusion that the thinning was caused by the basal slide due to the basal melting. This conclusion is different from Thomas' consideration that the thinning of the West Antarctic ice sheet was caused by the increase in the tensile strain rate.The thickness change of the Khumbu glacier was analyzed by the same method. The result showed that the thickening observed at middle part of the glacier was not caused by the increase in mass balance but by the increase in compressive strain rate due to the propagation of the kinematic wave.
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