Sensors that are installed in several locations, including the ground, in the middle of the building, and the rooftop, detect seismic motions and tremors at the ground and in the building. The control computer analyzes each signal and issues a drive order. The actuator follows the order and drives the added mass. The added mass moves to counteract the seismic motion and tremors. The duration of the above response is short, lasting approximately 1/100 of a second.

The weight of the added mass is about 1% of the building's weight. By driving this added mass, the shaking and tremors caused by medium-sized and minor earthquakes and by strong winds can be reduced by 1/2 to 1/3. This system is controlled by a highly reliable computer system and can counteract complex shaking and tremors. Therefore, the use of this seismic response system is eagerly anticipated for super high-rise and ultra super high-rise buildings and other tall, narrow buildings, which are easily affected by wind.