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A number of big intermittent aftershocks often follows a great earthquake. Even if a certain building escapes from the collapse due to the first main quake, there is no guarantee that the building can survive from the aftershocks. If it is possible to monitor the condition of the buildings constantly using some faint random vibration caused by background vibration such as wind, weak earthquakes and traffic vibration, the safety will be more secured. The authors have proposed cumulative harmonicdoi:10.18154/rwth-conv-239531 fatcat:gxb7ovro2bedba4yba24o2yeta