Abstract: The direction of the earthquake disaster affected field determines the spatial distribution of the earthquake disaster scope, and further influences the post-disaster emergency command and decision. The 7.0 magnitude earthquake occurred at 2017-08-08T21:19:00 is taken as an example; the location data of the internet mobile phone before and after the earthquake area are used. The spatial distribution characteristics of the disappearing mobile phone location data and the orientation direction of the distributed discrete point sets are obtained by using the standard deviation ellipse model in the spatial econometric analysis. The direction of the earthquake disaster affected field is determined to be northwest direction, which is consistent with the direction of affecting field released by China Earthquake Administration. This shows that the research ideas and methods have certain reference value for the earthquake disaster information acquisition on the first time.

Key words: mobile phone positioning, earthquake disaster, affecting field, standard deviation ellipse