Unfortunately this is not the kind of early warning system you can put in place on any kind of official basis.

I’m pretty sure I’m related by marriage to President and Sister Laycock, serving as mission presidents in Chile.  They had an interesting experience prior to the earthquake there in 2010.

President Larry Laycock and his wife, Sister Lisa Laycock head the Santiago Chile East Mission and had spent the two weeks prior to the 8.8 earthquake visiting each missionary apartment and preparing them for an earthquake.

Article about it from Meridian Magazine here.