中国科学技术大学吴忠庆教授与其合作者研究揭示,下地幔矿物中铁的自旋转变会导致地幔中部的纵波波速对温度变化不敏感,解释了多个地震层析成像观测到的不寻常波速结构的成因,从而为利用自旋转变效应认识地球内部结构打开了一扇门。研究组通过分析自旋转变下的弹性数据,发现自旋转变可在地震层析成像图中留下可观测的多个特征,例如它会导致纵波波速在约1 750公里深度对温度变化不敏感,其后果 A study by Professor Wu Zhongqing and his collaborator at University of Science and Technology of China revealed that the spin-on of iron in the lower mantle minerals causes the longitudinal wave velocity in the middle of the mantle to be insensitive to temperature changes, explaining the unusual wave velocity structure observed by many seismic tomography Cause, thus opening up a door to recognizing the internal structure of the Earth using the spin-transformation effect. By analyzing the elastic data under spin transitions, the team found that spin transitions can leave observable features in seismic tomograms such as the fact that it causes the longitudinal wave velocity to be insensitive to temperature changes at a depth of about 1 750 km The consequences