福建永安石林地貌的现代生物喀斯特侵蚀营力

本文以永安石林为例，阐述分析了石林地貌的现代生物喀斯特侵蚀现象的类型及形态特征。结果表明，地表及地下的生物喀斯特侵蚀营力是石林现代侵蚀过程的主要因素，石林表面的大部分均有微生物覆盖并起侵蚀作用，形成明显的微观及超微溶蚀形态，石林表面的溶蚀作用性质不同于传统认识。对石林地貌发育提出了新的思考。     

工程勘察中稳态瑞利面波法解释理论的探讨

工程勘探中稳态瑞利波法的实测曲线与介质性质有着密切的对应关系.传统的解释理论以自由表面瑞利面波的传播为基础.然而源检距很小时,漏能型面波（或多次复合反射波）的形成能更合理地解释记录曲线上的特征点.解释理论的正确性将有利于扩展该方法的实际应用.     

Simple analytical Green's functions for ray perturbations in layered media

The total Green's function for two-point boundary-value problems can be related to the propagator for initial-value problems. A very simple expression for the Green's function is obtained when the unperturbed medium may be described by material with a constant gradient in quadratic slowness. The derivation requires a correct understanding of assumptions made in the propagator solution. Expressions are also obtained for Green's function in multilayered media.