Raspberry shake clipping out

Technical Support
#1

Hello!
I have 2 raspberry shakes at the same place, and im evaluating how much noice goes up to a cabin that is above a raspberry shake:
Shake in ground:
https://dataview.raspberryshake.org/#/AM/RCF68/00/EHZ

Shake in cabinet:
https://dataview.raspberryshake.org/#/AM/R2AD2/00/EHZ

Now i am thinking about buying a shake 3d and having that in the cabinet aswell somewhere else.
But i was thinking about when the shake will clip out. As we can see now, the shake that is in the cabinet has a value of 1.5 M^^S. Can i have a 3d shaker that manage the levels of that or am i best off with the already bought 4d shake?
https://dataview.raspberryshake.org/#/AM/RCF68/00/ENN

Question nr 2. There is an arrow on the shake that has an error and N ---->, is that the ENN value? and the ENE is side to side?

Where can i read up more on seismology?

1 Like
#2

Regarding your first question: I would say that this is a practical example of geophone (weak motion detection) clipping vs accelerometer (strong motion detection) non-clipping: https://twitter.com/GeoGinger/status/1426580715416825861/photo/1

Clipping happens a bit above/below ±0.02 M/S for a geophone. You can explore this by going here Data View: Raspberry Shake Data Visualization Tool and selecting August 14th, 2021 as a date.

The event at ~12:29 UTC is clearly clipped on the EHZ (geophone) channel, but is not on the EN* (accelerometers) channels.

For your question #2: The arrow is required as our 3D and 4D models have to be oriented with the arrow pointing towards the North, so that the horizontal geophones/accelerometers (North-South and East-West) can detect waves in the correct orthogonal orientation. So, as you correctly said, ENN will be along the NS axis, and ENE will be along the perpendicular EW axis.

There are a lot of threads on the forum about general knowledge: Notes on how I use my Raspberry-shake but I also encourage you to check our Educational resources: https://edu.raspberryshake.org/ and the pages from the old IRIS (now EarthScope Consortium): Education and Public Outreach | IRIS

#3

https://dataview.raspberryshake.org/#/AM/R2AD2/00/ENE
Can you make the dataview use the same M/S on both graphs at the same time?

#4

Hello Rower,

Which graphs you are interested in? If these “two graphs” are plots of different channels (for example, EHZ and ENZ), then it is not possible to display the same units, as the two sensors that detect the data in the same channels measure different things (here, velocity and acceleration, respectively).