Spatial-temporal distribution of historical earthquake events in Beijing-Tianjin-Hebei area
Hu Hui-Wen1, Wang Yong-Bo1, Jiang Han-Chao2, Li Zhen1, Hu Xue-Jing1, Han Yu-Jia1
1 College of Resource Environment and Tourism,Capital Normal University,Beijing 100048,China; 2 Institute of Geology,China Earthquake Administration,Beijing 100029,China
Abstract：The North China Plain is located in the Circum-Pacific Seismic Belt where earthquakes occur frequently. The Beijing-Tianjin-Hebei area,which is the capital economic circle,has attracted much attentions. It is of great significance for the reconstruction of earthquake history to obtain the spatial and temporal distribution characteristics in this region,which may provide important reference for the early warning of earthquake events in the future. Therefore,earthquake events recorded in historical documents and seismic stations were collected and analyzed in this study. The results show that 1044 earthquake events were recorded in Beijing-Tianjin-Hebei area between 231 BC and 2018 AD. The felt earthquakes and moderate earthquakes were the main types,while small earthquakes,strong earthquakes and major earthquakes showed rather low frequencies. The seismic record integrity analysis confirms that the earthquake(M>3)records were basically complete since 1400 AD,which could be used for statistical analyses. The historical earthquakes in Beijing-Tianjin-Hebei area represent a T-shape spatial distribution,consisting of a northwest to southeast seismic zone and a northeast to southwest seismic zone. The historical earthquake records presented periodic variations,showing much higher frequencies during the periods of ca. 1480-1680 AD and after 1950 AD. The spectral analysis on the earthquake frequency sequence yields a recurrence period of 45 years,which represents a kind of recurrence time for the high frequent earthquake years. In addition,the earthquake events expressed monthly variations as well,revealing higher frequencies during summer and autumn months,along with a seasonal migration of high frequency region from west to east in the study area. Finally,according to the temporal distribution of the earthquake events,the Beijing-Tianjin-Hebei area will possibly experience a period of high potential of destructive earthquakes in the near future.
Hu Hui-Wen,Wang Yong-Bo,Jiang Han-Chao et al. Spatial-temporal distribution of historical earthquake events in Beijing-Tianjin-Hebei area[J]. JOPC, 2021, 23(2): 435-448.
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