Figure 1. Millikan Library. (a) View from the northeast. The two dark walls in the foreground comprise the 30.5-cm-thick east shear wall, which is somewhat narrower on the ground floor because of walkway openings. The wall panels and concrete moment frame are visible on the north face. (b) North–south section. Walkway openings on the ground floor, which cut through the shear walls, are represented by crosses. (c) Typical plan view. The dark circle is the approximate position of SCSN Station MIK on the ninth floor, the arrows are the approximate positions and orientations of the three USGS channels on each floor (from first floor to roof).