TY JOUR TI Deformation precursors of large earthquakes derived from long term GNSS observation data KW Earthquake precursors KW Earth's surface deformation KW GNSS observation KW San Andreas fault KW least square method KW seismic cycle related deformations KW earthquake interaction KW forecasting and prediction JO Russian Journal of Earth Sciences AU Kaftan, V.. AU Melnikov, A.. PY 2016 IS 16 PB Geophysical Center of the Russian Academy of Sciences