What’s inside an STS-2 Seismometer? Ants!

I am starting a new section on the OSOP page. It will be called What’s Inside. It will mostly be seismometers but surely not limited to that. You just never know that the things you learn dissembling that Mikrotik Groove radio will come in handy when you are building a borehole accelerometer.

I will start with what is inside the industry standard the Streckeisen STS-2, just photos for now but as I have time I will draw arrows and make comments. Most of these photos are looking from the bottom into the insides. I have misplaced all of my photos of looking from the top into the insides but when I find them I will add them the post.

Well how did the ants get in???

seismometer full of ants

seismometer full of ants

STS-2 seismometer no ants

STS-2 seismometer no ants

The STS-2 has a warp-less base plate, that would be the thick stainless plate between the green pressure covers. The three identical sensors are bolted to the warp-less base plate and then the green covers are bolted together separated by some spacers. The bolts and spacers do not touch the warp-less plate. There is an orange o-ring between which the warp-less plate floats, pressure on the bottom of the plate and top of the plate are always equal. The o-rings seal out many things like water and air, but must have had something yummy to ants. They ate a hole in the ring and them found the insides to be nice and dry and warm.

In future additions to the What’s Inside section I will have 3D-lite, L4, Guralp, Trillium 40, and more. Please send me photos of what you have discovered inside: angel at osop dot com dot pa.

The ants photo came to me via the IRIS/Passcal Instrument center, the rest I took myself.

For more photos of What’ s Inside an STS-2 (without the ants!) visit the What’s Inside an STS-2 Page

– Angel

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