Seismic Velocities under Dynamic Pressure via Stimulated Brillouin Scattering

该合同将为受激布里渊散射仪器系统的开发提供三分之二的资金，该系统将使用动态冲击压缩技术来测量地幔温度（高达3500K）和压力（高达130 GPa）条件下地幔矿物中的纵波和横波地震速度。该仪器系统将在加州理工学院地质与行星科学系的冲击压力实验室开发。加州理工学院承诺提供剩余的三分之一的资金来实施这个项目。迫切需要对被认为存在于地球深部地幔中的物质进行地震速度的直接实验室测量。从地震和其他地震信号重建的地震速度-深度剖面的地质解释需要这种测量。目前的高压技术不允许在静压条件下进行这种测量，而在本项目中开发的冲击波技术提供了获得这种测量的唯一手段。

This award will provide two-thirds funding for the development of a stimulated Brillouin scattering instrumentation system that will use dynamic shock compression techniques to measure compressional and shear wave seismic velocities in minerals of the Earth's mantle under mantle conditions of temperature (up to 3500K) and pressure (up to 130 GPa). The instrument system is to be developed in the shock pressure laboratory in the Division of Geological and Planetary Sciences at the California Institute of Technology. Caltech is committed to providing the remaining one- third funding necessary to carry out the project. There is a strong need for direct laboratory measurements of seismic velocities in the materials considered to exist in the Earth's deep mantle. Such measurements are required for the geological interpretation of seismic velocity-depth profiles reconstructed from earthquake and other seismic signals. Current high-pressure technology does not permit such measurements under conditions of static pressure, and shockwave techniques to be developed in this project offer the only means of obtaining them.