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Wang Hui,Cao Jianling,Shen Xuhui
Author NameAffiliation
Wang Hui Institute of Earthquake Science, China Earthquake Administration, Beijing 100036,China 
Cao Jianling Institute of Earthquake Science, China Earthquake Administration, Beijing 100037,China 
Shen Xuhui Institute of Earthquake Science, China Earthquake Administration, Beijing 100038,China 
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Background Seismicity and Its Application to Seismic Hazard Assessment in the North China Region
Wang Hui,Cao Jianling,Shen Xuhui
Abstract:
The historical earthquake activity is intense in the North China region. However, no middle-sized earthquakes have occurred in the last decades in the region since the MS6.2 earthquake in the Zhangbei region in 1998. The quiescence of moderate and strong earthquakes is quite prominent in North China. In this paper, we use small earthquake records in 1970~2009 to study background seismic activity in the North China region. The spatial distributions of seismic parameters are presented, including b-value, the maximum magnitude and annual occurrence probability of earthquakes of M≥6.0. Our results show regions with low b-value that include the Yuncheng region in the Shanxi rift, the Suqian region located in the Tancheng-Lujiang fault zone and the Shijiazhuang region in the Taihangshan block. Our analysis on the synthetic spatial pattern of seismicity indicate that seismicity in the North China region is mainly affected by the regional dynamic factors of deep structures.
Key words:  North China  Seismicity  b-value  Seismic hazard