报告摘要：

A standard procedure for modeling a 3-D seismic velocity structure in Japan has been proposed by the Headquarter for Earthquake Research Promotion, The revised procedure shows the modeling a regional 3-D seismic velocity structure of shallow and deep sedimentary layers for broad-band ground motion estimation using various kind of geophysical and geological datasets such as extensive refraction/reflection explorations, gravity surveys, surface geology, borehole logging and microtremor survey. A detailed 3-D seismic velocity structure in the Kanto region, Japan, was generated in accordance with this procedure. This speech will explain the results of this modeling of the velocity structure including background and engineering needs of the velocity structures.

报告人简介：

Prof. Hiroaki Yamanaka received the Ph.D. degree in Tokyo Institute of Technology in 1989. He is now a professor of Environment and Society Yamanaka Laboratory of Tokyo Institute of Technology, specialized in the investigation of artificial earthquakes and their micro-motions in underground structures, evaluation of strong vibration characteristics and numerical simulation of wave propagation.

报告摘要：

Large inland earthquakes sometimes accompany surface ruptures which affects infrastructure and buildings along the fault line by the permanent deformation; typical damage of this kind occurred during the 1999 Kocaeli and Chi-Chi earthquakes. Even though the surface rupture is well-recognized phenomena associated with inland earthquakes, there are very few seismic codes stating specific provisions against the rupture. The report briefly introduces observations about the surface ruptures and affected infrastructures associated to the 2016 Kumamoto earthquake (Mw=7.0), central Kyushu Island, Japan. The ruptures crossed a lot of infrastructures. Some bridges suffered severe damage due to the surface rupture: they resulted in long recovery time of the route. An earth-filled dam and a box culvert underpass deformed by the ruptures survived. Although the general location of the ruptures matched well with the pre-known fault traces, some surface ruptures that caused structural damage are difficult to predict.

报告人简介：

Prof. Masayuki Yoshimi received his Ph.D. degree in civil engineering from Tokyo University in 2001. He is now director of the researchers in the Comprehensive Center for Geological Survey of the National Institute of Advanced Industrial Science and Technology(AIST), mainly engaged in natural disaster science and disaster mitigation research, presided over the basic research on earthquake disaster prevention for nuclear power stations and other important facilities, and has rich research achievements and experience in such aspects as seismic microzoning, earthquake simulation and disaster prediction, as well as underground structure survey method research.