In some areas, small and medium earthquakes occur intensively around the epicenter of a major earthquake in the future, and the central part forms a seismic space. Some medium and small earthquakes are arranged in stripes, or two crosses are formed. Of the large earthquakes may occur near the intersection of the stripes. Japan Motegi Qingfu found that in a series of earthquakes have occurred in some seismic zone, if there is no large earthquake has not been empty, the future of the earthquake may be in the empty zone of this event occurred. In some areas, epicenters of major earthquakes are interconnected and tend to form some form of network-like distribution. In other areas, epicenters of large earthquakes have migrated in a certain direction or occur in a vacant part. These seismic activity images are related to their tectonic setting, which may reflect the process of tectonic stress, and the trend of these seismic images may also provide information for earthquake prediction.
Source: Atlas of China's Natural Disaster System
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