Abstract: Based on the tidal theory, this paper discussed the method to calculate the tidal and non-tidal parameters, and analyzed the short-term anomaly characteristics before the Shihezi and Bachu earthquakes using the observed digital deformation data in Xinjiang region. Finally, we have preliminary obtained the threshold value for determining the anomalies and short-term anomaly images before strong earthquakes.

Key words: Digital deformation observation, Short-term anomaly, Earthquake