Combination of image-sound-vibration integrated sensing and robust data transfer is used to construct a change detection system of building group in urban areas in preparation for unexpected events. The field test under severe condition has been performed in the remote island, Gunkanjima. Nine buildings on the island are selected to monitor the long-term evolution of damage and deterioration through sensor fusion of MEMS acceleration sensor network for vibration sensing, microphone array for sound sensing and surveillance camera network for image sensing. The overall framework and current situation of the Gunkanjima monitoring are reported and future perspective is presented.
Dynamic behaviors of building 70 during a moderate typhoon are reproduced by processing acceleration data acquired by the vibration sensor network in Gunkanjima. Almost half of the ground supporting the building has been lost by erosion and scour in the past severe typhoon. The effects of ground vibration induced by high waves and strong winds on structural responses are investigated. Action of wave and wind on the island changes every moment during a typhoon. It is concluded that different vibrational modes of the building are excited by different load combinations of wave and wind.