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Although the guidelines [HAF0101 (1)] relatively Guide (HAF0101), the dispersion of the earthquake has taken one step further discussed, but the concept of dispersion earthquake, the domestic academic engineering in theory there are still different perceptions. According to China's actual seismic geological data, a detailed analysis of the control [HAF0101 (1)] on the relevant guidelines, in practical work, the diffusion by the earthquake two different types of earthquake to deal with, would enable the dispersion of the seismic issues have been smooth Solution.
In fact, the diffusion earthquake contains two types earthquake, and is a known earthquake structure, indicating the relationship between small and medium-sized earthquake, calling it a "dispersion-type earthquake" and the other is known of the tectonic earthquake are not relevant or not To identify its structure to those of the earthquake history of strong earthquakes, earthquakes of this type known as "special type of dispersion of the earthquake," We usually dispersion of the above two types of seismic collectively referred to as the diffusion earthquake.
(1) diffusion of earthquake
Comparing the earthquake spatial distribution of such discrete, and it is very uncertain, even if a substantial number of small and medium-sized earthquake along the distribution of certain structural zone, but also a number of small and medium-sized earthquake occurred in the absence of the surface structure or even deep structure is not clear the area. These earthquakes are often distributed in a larger regional context, this earthquake use of the existing seismic and geological data also does not recognize its tectonic earthquake, there was no obvious sign of the structure, the greater dispersion of uncertainty, mainly for small and medium-sized Earthquake, earthquake of such a large number, but the magnitude smaller. It is precisely because of such seismic activity of the dispersion characteristics, guidelines and some member countries proposed to use the earthquake zone to evaluate this type of tectonic earthquakes on the impact of the nuclear power plant project and to consider nuclear safety from the assumption that this type of tectonic earthquake in the earthquake throughout the region Are possible.
(2) special type of dispersion earthquake
Diffusion is a special type of earthquake that occurred on the difficult history of the earthquake, the spatial distribution of uncertainty, or despite investigations, but the structure of the earthquake are still not found, but also with the earthquake has confirmed no structure, no such number of earthquake , But the magnitude larger, the site may have a greater impact. Such earthquakes are often more complex, perhaps because the past, not enough in-depth investigation related to history or imperfect and uncertain, may also be using the existing seismic and geological data also does not recognize its tectonic earthquake, or because some of the tectonic earthquake There is no recognition of the existence of underground or surface phenomenon, it might experience a time scale (that is, to repeat the fault displacement interval) than the earthquake observation of the long cycle. On the assumption that such historical earthquake in the region where the earthquake had the same tectonic earthquake potential is obviously wrong, otherwise it will over-exaggerate the risk of earthquakes, therefore, identified in the application of this method to evaluate the impact of earthquakes on the site , The following guidelines on appropriate, "and the site of the earthquake in the region of the specific structure of the tectonic earthquake unrelated to the greatest potential earthquakes, should be assumed that occurred in a specific distance from the site, this distance in research and investigation On the basis of recognition to ensure that the distance is not the tectonic earthquake. "
According to China's seismic activity characteristics of the research results, the above two types of dispersion earthquake are there.