A semi technical question re my RS4D

I have my shake in the closet of my house, which sits on a large concrete pad. The RS also sits on this same 4000 sq foot floor (concrete pad). Would I see any differences in the sensitivity of the RS if I placed a standard sized brick on top of the RS, to ensure better physical connectivity with the concrete slab?
Would sensitivity be increased, or would there be damping or no change? Just curious.

Hello Gary,

it is indeed a very interesting question! The placement on a concrete pad is already one of the best for our Shake, ensuring good quality data, keeping in mind that there is no strict need of an anchor: https://manual.raspberryshake.org/commonlyAskedQuestions.html#anchoring-how-do-i-anchor-my-raspberry-shake-to-the-floor

To answer your question, there shouldn’t be any negative effects for your RS4D of putting a standard brick weight on top of it, other users have done something similar for their seismic vaults (like here: https://manual.raspberryshake.org/_downloads/Kinabalu-downloadedSept252018.pdf).

However, regarding the eventual positive effects, going by theory, the sensors work at their best when they don’t have any other movement than the one produced by the shaking of the Earth, as you can easily imagine, because everything else would be only unwanted noise (in the case of wanting to measure earthquakes).

So, adding a weight, or anchoring it to the ground, would pose a possible advantage, especially with stronger motions. On this, we encourage you to experiment in the coming days/weeks/months, and if you want, keep us posted with your results!

To close, a great example of a Shake anchor, realised by Steve Caron for his instrumentation: https://raspberryshake.org/diy-guide-for-a-home-raspberry-shake-vault/


The best thing is to anchor it to the slab as Stormchaser said, if you can’t, the solution you propose works.
Regarding damping, this does not change. It adds damping in the case that you put it on carpets or wooden floors

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