报告人简介（续）：

他在Science、Tectonics、Journal of Geophysical Research等发表论文百余篇Google scholar被引5000多次。曾受邀在斯坦福大学、哥伦比亚大学、北京大学、麻省理工学院、耶鲁大学，爱丁堡大学，乌普萨拉大学等十多个国家的上百所高校做学术报告。 Liu，Zoback，Segall 利用现代GPS观测技术和传统的大地测量技术来研究板内地震震间应变积累并由此估算大地震重发周期的研究是在这一领域最早的开创性工作，其结果在Science(《科学》)期刊上发表并引起广泛关注。刘澜波关于电磁波在复杂地形条件传播的成果获得了美国陆军工程兵研发成就奖、美国陆军部技术卓越研发成就奖。刘澜波教授现在韩国釜山国立大学作为韩国自然科学基金会邀请的客座研究员进行地震地质灾害方面的研究。

报告简介：

Most mineral and energy resource exploration and geotechnical engineering projects are conducted in the shallow depth (above 10 km) of the earth where both material property and physical condition are highly heterogeneous. Undoubtedly, the stress state variation caused by the topography is one of the heterogeneities and significant enough to be neglected. We adopted the perturbation approach and proposed an approximation algorithm (Liu and Zoback, 1992, JGR) to account for the topographic effect on the stress state in the shallow depth of the earth. The algorithm summarizes the zero-order effect generated by the gravitational vertical load and the first-order effect generated by the secondary horizontal basal shear induced by the vertical load. The zero-order problem can be solved by the convolution of the topographic elevation and the Green’s function of the Boussinesq’s Problem, while the first-order problem can be accounted by the solution of the zero-order problem and the Green’s function of the Cerruti’s Problem. By this approach we can estimate the stress due to the topographic load at any field point in the ground. With the superposition of the regional tectonic stress, we can estimate the hypothetic ‘in-situ’ stress state for any given region. I applied this method to estimate the topography effect on stress state in the Cajon Pass Scientific Drilling Project in South California, and the Sichuan-Tibet region, where the great Sichuan-Tibet Railway (STR) passes through with many tunneling projects along the route, to illustrate the theory and application.