Hi Shan. Not a tilt meter. Now I’m at a complete loss as to how your data works. That could be a problem. If no one understands what it is that you are doing then they can’t duplicate it.

A tilt meter doesn’t measure changes in gravity. It measures the changes of the Earth’s surface. A magnetometer measures the changes in gravity. In 1993 here was a drop in the magnetics in the area of the Parkfield M=6.0 quake. That would be on the southwest side of the fault. At the same time there was an increase in the magnetics on the northeast side of the fault. Nothing occurred that could be said to be related to the changes unless you want to say the recent M=6.0 was the results of the change. I suppose that could be possible, but highly improbable. Take Care…Don in creepy town