Study on the characteristics of earthquake’s impact on cities |
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| Authors: | Pan Hua Zhao Feng-Xin and Gao Meng-Tan |
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| Institution: | (1) Institute of Geophysics, China Earthquake Administration, 100081 Beijing, China |
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| Abstract: | Firstly, the impact of historical earthquakes on 34 China province-level capital cities is evaluated by using historical earthquake
catalog. The distribution of affected intensity shows, about 53% of cities have even not been affected by earthquake intensity
VI, and 44% of cities have been hit by earthquake intensity VII to IX. For most of the cities, occurrence frequency of affected
intensity VI is usually higher than that of affected intensity larger than VI, and the value of affected intensity with maximal
occurrence frequency may be very different among cities. So both the maximal affected intensity and the affected intensity
with maximal occurrence frequency should be taken into account when the prevention seismic intensity needs to be determined.
Secondly, considering the incompleteness of records of historical earthquakes, a method of earthquake catalog computer simulation
is introduced to study the features of affected intensity of big cities. 69 county-level cities of Fujian Province are selected
to be statistical objects. The statistical result shows, for different risk levels the seismic intensity changes greatly among
cities, the seismic intensity of 2% probability of exceedance in 50 years can be regarded as the characteristic affected intensity
of city, and can be the basis of determining the city special earthquake prevention level and a proper indicator of future
earthquake’s impact on cities.
Foundation item: A Public Benefit Foundation of the Ministry of Science and Technology of China. Contribution No. 04FE1005,
Institute of Geophysics, China Earthquake Administration. |
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| Keywords: | city group affected intensity characteristics earthquake probability of exceedance |
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