Buildings 16-20 are the second oldest building set in Gunkanjima and almost located in the center of the island. Each building is mutually interconnected by a large corridor at one end and fixed to a rock mountain at the other end. Mutual coupling effect among buildings 16-20 is investigated by processing acceleration data acquired by the vibration sensor network using accurate MEMS acceleration sensors. It is shown that vibrational characteristics of each building are strongly influenced through mutual coupling among buildings under ambient vibrations.
