This morning, we installed an accelerometer near the velocimeter (Guralp) in the CEB hall, Figure 1 and Figure 2:

TCS room - CEB_ADC7674_1, SN 56, channel 10
name: ENV_CEB_ACC_V

The purpose is to monitor the vibration of the floor during the acoustic injections at high frequency (above ~200 Hz).
A comparison between the spectra of the velocimeter (red curve) and the accelerometer (blue curve), as well as their coherence, is shown in Figure 3.