Vibration Sensors D7S The World s Smallest Class Size, High-precision Seismic Sensor. IoT Friendly.Vibration Sensors D7S Compact & High-precision Seismic Sensors - - Reducing Secondary Disasters from Earthquakes 9.8mm 10.9mm D7S Relationship between SI Value and What Is an SI Value Measured Seismic Intensity Equivalent Value 7 The SI value (or spectral intensity) is equivalent to the magnitude of Seismic intensity scale of Japan the destructive energy imposed by seismic motion on structures. 6 The SI value, which is the average value of the integrated velocity response spectrum, is an index that expresses the destructive force of 5 seismic motion and is highly correlated with the damage to structures. 4 2.5 1 SI value SI value (kine): Logarithmic axis SI = Sv ( T,h)dT formula 3 2.4 0.1 1.0 10.0 100.0 2