INVESTIGATION AND ANALYSIS OF MACROSCOPIC ANOMALIES BEFORE AND AFTER YUTIAN M_S7.4 EARTHQUAKE ON MAR.21,2008

In this paper,we summarize general characteristics of anomalies from a large number of earthquake-related macroscopic phenomena.After Yutian MS7.4 earthquake on Mar.21,2008,we investigate and collect a lot of reliable macroscopic phenomena.By sorting out and analyzing those data,we conclude that macroscopic anomalies associated with the earthquake appeared mostly in several days before the earthquake occurred,which suggested that these have certain short-imminent term anomalies.The spatial pattern of the anomalies was nonuniform,which concentrated on the region near epicenter and high-intensity zone.