基金This research is financially supported by the Key National Research Project of China （Nos. 2016YFC0303100 and 2017YFC0601900）, the Key Program of National Natural Science Foundation of China （Nos. 41530320 and 41774125）.
基金This paper is financially supported by the Key Natural Science Foundation （No. 41530320）, Natural Science Foundation （No. 41274121）, Natural Science Foundation for young scientist （No. 41404093）, and the Projects on the Development of the Key Equipment of Chinese Academy of Science （No. ZDYZ2012-1-03）.Acknowledgments We thank Dr. Chen Tianyou of CGG for providing the MULTIPULSE system. We also like to thank Tan Handong and Wang Shuming for their helpful comments that improved the quality of the manuscript.