Bai Zhiming, born in 1971, is an associated researcher at the Institute of Geology and Geophysics, Chinese Academy of Sciences. He obtained his doctorate from the Institute of Geophysics, CEA. He is mainly engaged in the study of crustal and mantle structure related to geodynamics, and processing and interpretation of deep seismic sounding data. E-mail: bbzzmm @ mail. iggcas, ac. cn