GPS technology and seismic monitoring earthquake

For earthquake monitoring and prediction, this urgency is particularly significant, because our seismic network, especially in earthquake precursor network, there are serious defects in the three main: 

First, from 1988 to 1999, mainland China there were 53 earthquakes above 6, 7 of 9 earthquakes, if east longitude 105 ° as the boundary, the western region 8, the eastern region to 1 for 8 : 1. However, in longitude 105 ° west, the sparsely populated and inaccessible Network layout is extremely rare. A release of more than 90% of seismic energy areas, stations and networks too thin, no doubt a waste of valuable natural resources, seismic information, which greatly delayed the practice of human beings, thereby delaying the process of improving the level of earthquake prediction. 

Second, the national seismic precursor network is to "point measured" relative change of the form of daily observation, the observation stations are relatively independent of station no relationship between the data. Once an exception, because it is the Observation Point, there is no surface contact, it is difficult to judge its authenticity.

Third, the seismic activity is a regional and global, while the precursor observation is independent, not relevant, it is difficult to study its relationship with the global seismic activity. 

Can be encrypted for the western observer, with a global framework for meaning, and "surface structure" to contact the high-precision observation system, only the use of space measurement techniques (Very Long Baseline Interferometry - VLBI, human health ranging - SLR, GPS systems - GPS, satellite remote sensing - RS, synthetic aperture radar interferometry - INSAR). GPS technology, especially the past 10 years, in particular the development of fast, accurate observations increased almost three orders of magnit