That sounds fairly simple. I thought that the gravity part of his forecasting routine might be more complex.

Regarding human and animal sensitivity to approaching earthquakes,

My own data indicate to me that some of the signals which they are detecting may be linked with geomagnetic storm related "resonance" effects which are taking place between fault zones around the world. One interpretation of those data is that an approaching earthquake can be about to occur in fault zone A. But at times its warning signals will instead be generated in fault zone B which could be 1000 miles away. People living near fault zone B who are watching the animals for behavior which might signal the approach of an earthquake would then encounter a “false alarm.”