Good afternoon,
The Raspberry 3D Station is successfully connected, but the ground motion signal is bad >=150 micrometers/s and we don’t get values for displacement, velocity and acceleration. The station is connected to Kinemetrics SS-1 seismometer’s sensor. In addition we are sending the log files. Can you tell us what should we do? Thanks for your help!
Have a good day,
Ljubcho
RSH.R6497.2021-07-08T11_24_34.logs.tar (2.8 MB)
Hello Ljubcho, welcome to the community!
Thank you for the logs from your RJAM. From them, nothing particularly strange appears, except for a couple of hard resets of the unit which I assume you have done manually.
Did you configure your RJAM by yourself or was it done by us for you?
In which location have you put the RJAM? That value is usually associated with a not “silent” location, so if you can (and haven’t already done), please follow our advice on the subject:
The best location for your Shake is the “quietest” place possible. In some cases, this could be on a concrete slab of the lowest floor of your building, near a foundation wall, and away from washing machines, air conditioners, and similar “noisy” things. Also, a shed out in your yard or a corner in your garage would be good places. The best ones are naturally quiet locations far away from people and traffic and with an internet connection.
To see live values for counts, displacement, velocity, or acceleration, you have to use other software, such as our RSUDP, or SWARM, or a different one. We provide a list on our manual here: How to visualize the waveforms in real time — Instructions on Setting Up Your Raspberry Shake
The seismometers SS-1(velocity) are placed on a rock with three components (professionally connected). The length of the cable which distribute the data is 9 m + 20 m. The RJAM is placed in the work room one floor above the sensors. The sensors have registered earthquakes last couple of days which were analyzed with Seismic Handler program but the RJAM station haven’t registered peaks on helicorder.
http://rs.local/heli/R6497_EHZ_AM_00.2021070900.gif?v=1625818435 - link to helicorder.
The configuration of the RJAM was done by you except the location which was done by us.
Thanks for your help and thanks for your suggestions for the software!
Hello Ljubcho,
Thank you for all the further information that you have provided. Two things for you:
- We recommend the cable that connects the RJAM board to the sensors to not be longer than 10-20 cm since beyond that length it will start to act as an antenna of sorts, and capture all kinds of unwanted signals. If possible, I think you should move the RJAM station closer to the sensors. This is, however, just a suggestion, and if you see that what you record is not ruined by spurious signals, then there’s no problem.
- Since you have connected non-OSOP sensors to the RJAM board, the instrument response is not known to us, and thus, it is not possible for StationView to visualize the data in a proper and correct way. This is why you were seeing all those >150 um/s values.
Lastly, thank you for noticing this since it will allow us to correct our station display code and avoid these misunderstanding in the future.
Can you please, tell us what are the Raspberry Shake sensors and where could we buy them to make our stations to produce usable data. Thanks in advance!
Hello jovanovlj,
You can find a list of usable sensors in the “Examples” section of the RJAM page on our manual: Raspberry Jam (RJAM) Universal Digitizer — Instructions on Setting Up Your Raspberry Shake
Or, you can also write an email to sales@raspberryshake.org, explaining that you only need a number of geophone sensors for your installation, and they will be able to help you.
You’re welcome!