[Yamamura, Yuzurihara, Yokozawa]

We performed the tapping test at various places around OMC area.
The detail is placed in JGWDoc15370.

1. Bottom side of OMC chamber
As you can see, there are some excess in the spectrum of geophone inside the vacuum, but it seemed not critical vibration.
Beam duct tapping between OMC and OMM chamber is larger.
(But I couldn't control the tapping power)

2. OMC chamber +Y side
We performed the various placed at the +Y side of the OMC chamber, the vibration would be larger.

3. White structure for the vacuum pumps
Surprisingly, we can see the excess of spectrum when we tapped the white structure for the vacuum pump.

4. Cable floor
When we tapped the cable on the floor, some excess can be seen.

Also, we performed the tapping test at various places with checking the spectrum, but we could not find the critical point at this time.