That just means I've got it mounted on the concrete slab and it is giving the general noise of the house. I can do very light taps on the floor and it registers them as a surface wave. You don't bother with more sensitivity in the city. If we had any earthquakes, it would register them. But I don't.
Next effort is to get a continuous velocity screen, which is more like a seismometer. Right now, that running squiggle is acceleration.
In a world with physics, we'd be using a lot of these to stop earthquake deaths. But we don't.
ps. I've now got continuous velocity. Sensitive to a tap anywhere in the house.
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