List of Figures

• Half of 3-D unstructured mesh, moon-shaped basin region (yellow), surrounded rock region (blue and red), element shape: tetrahedra.
• Comparison of results from BEM and FEM simulations for a same case in the Moon basin. Each individual plot represents time history of a certain displacement component along axis x or y on the surface, e.g., u(0,y) is the displacement E-W component along y-axis at x = 0.
• For the transparency case, the comparison of results from our FEM computation with those from the Green function shows basically identical responses at a observation locations. The first, second and third rows show the velocity components at a given location on the ground in north-south(N-S), east-west(E-W) and vertical(U-D), respectively.
• Surface distribution of S-wave velocity in the San Fernando basin. Epicenter of the aftershock is indicated by an x.
• Distribution of maximum surface horizontal velocity in the San Fernando basin.