Progress in studies on the structure and physical properties of the mantle in China

The studies on the structure and physical properties of the mantle by Chinese geophysicists from 2003 to 2007 are reviewed in this report. It mainly contains studies on the seismic velocity structure of the mantle,anisotropy of the mantle,mantle discontinuities,mantle convection and the physical properties of mantle. The review concerns mainly the contents,the methods used and the results of the studies. It can be found that new progress in the study on the structure and physical properties of mantle has been made in the last four years in China. In some preexis-tent areas much progress has been made,advanced methods have been adopted,extensive international co-operation has been conducted in many ways,and the scope of the co-operation has gradually expanded. More-over,some new fields appear as well.     

Inversion of Q value structure beneath the Tibet Plateau

ＩｎｖｅｒｓｉｏｎｏｆＱｖａｌｕｅｓｔｒｕｃｔｕｒｅｂｅｎｅａｔｈｔｈｅＴｉｂｅｔＰｌａｔｅａｕＪＩＡＮ－ＰＩＮＧＷＵ（吴建平）ａｎｄＲＯＮＧ－－ＳＨＥＮＧＺＥＮＧ（曾融生）（ＩｎｓｔｉｔｕｔｅｆｏＧｅｏｐｈｙｓｉｃｓＳｔａｔｅＳｅｉｓｍｏｌｏｇｉｃ...     

用振幅衰减系数和卓越频率衰减系数测定Q值的探讨

云南地区小震活动频繁,为充分利用这些小震所提供的信息,我们讨论了小震地震波振幅衰减系数和卓越频率衰减系数的变化,并探讨了这两个系数和Q值的关系。     

地面核磁共振找水仪及其在水文地质调查工作中的应用研究

本文概要介绍了地面核磁共振找水方法的原理和世界上最新的直接探查地下水的仪器设备--地面核磁感应系统的特点,并以实例说明了NMR找水方法的应用效果,提出了关于提高NUMIS系统抗干扰能力、完善解释方法、研制系列仪器等方面的建议.