中国大陆历史地震烈度统计

Statistical analysis of historical earthquake intensity in Chinese mainland

为研究中国地震烈度评定的时空分布特征,对中国大陆1966年以来464个地震的烈度数据进行统计,分析长期以来不同震级的震中烈度及灾区面积评定随时间的变化趋势,并对比中国东部和西部地区间的差异。结果表明:对于震级相同的地震,震中烈度和灾区范围的评定均存在波动,且在不同震级区间和不同时间阶段,波动的显著程度也有所不同。此外,中国东部和西部地区地震烈度评定虽然存在差异,但随着震级增大,差异逐渐减小。

In order to study the temporal and spatial distribution characteristics of intensity assessment in China, 464 earthquakes in Chinese mainland since 1966 were analyzed. We studied the variation trend of epicentral intensity and the area above Ⅵ degree to each magnitude for a long time as well as the differences between eastern and western China. The results show that, for the same magnitude, both the epicentral intensity and the area of the disaster region show a tendency of fluctuation for the observation period. Also, the significance of the tendency is different in each magnitude intervals and time periods. Although there are differences in intensity assessment between eastern and western regions, with the magnitude increasing, the difference decreases gradually.