... (Mei, 2010). The test chooses the sand, gpy- sum and barite as the similar materials, the simailar ratio of materials are shown in Table 2. 3.2 Layout of observation points Displacement observation: Surface displacement was measured by strain displacement sensor and selected automaticlly by data...

... SURVEY A questionnaire survey to estimate seismic intensity in the areas affected by the Wenchuan earthquake was conducted about one month after the main shock. People who had lived near the observation points were interviewed using the questionnaire (Otha and Omote 1977, Otha et al.1979, Otha et al.1986...