I was merely pointing out that this method is in use with scientific instruments. Just because the land has shifted or tilted isn't cause to consider an earthquake is imminent.

Shan's method is simply a crude tilt meter. And yes, it could work in poorer countries but it needs a year's worth of sun position before it can be used... whereas GPS readings daily are immediate. Another thing to consider is the continents are always on the move... take a look at how california is moving at SCIGN.ORG

Canie