Disclosed are apparatus and methods for seismic imaging which accounts for sea-surface variations. The invention provides players an opportunity to traverse a town or city represented symbolically on the game board by a plurality of landmark buildings and locales that can be found throughout a typical town. A support member supports the edge of the vibration member. % of tackifier resin, 10 to 60 wt. The DFE cooperates with the sampling circuitry to form a feedback path, such that the duobinary decoder is external to the feedback path. A protection film 6 is formed on the first insulating film 4 in the DRAM circuit region 11 and on the logic circuit region 12 except for specific regions 51 of the diffusion layer 5 around certain gate electrodes 3a.