九寨沟M7.0地震仪器烈度计算比较分析

地震发生后,强震动观测台网可以获取灾区分布式台站位置的强震动记录,通过基于这些强震动记录得到的地震动参数可以快速地评估地震烈度的空间分布,以迅速判定不同地区的受灾程度,尤其是地震极震区的分布范围,为政府开展应急救援并合理地分配救援力量、物资等提供依据,以保证救援人员及时、准确地到达极震区展开搜救工作,减少人民群众的生命财产损失。本文介绍了国内外7种地震仪器的烈度计算方法,基于四川九寨沟M7.0级地震获取的强震动记录,对这7种方法的计算烈度值进行了对比分析。结果表明,各方法计算的仪器烈度与宏观烈度的差值均在1度误差范围以内,均显示了良好的实用性,且行业标准法和综合判别法两者的计算结果较为一致。

Comparison of Different Methods Used to Calculate Instrumental Intensities of the Jiuzhaigou MS7.0 Earthquake

After occurrence of an earthquake, strong motion observation network can record ground motion at distributed observation stations. Based on the ground motion parameters from these records, the spatial distribution of seismic intensity can be quickly determined, and then the damage degree in different areas can be estimated. This kind of information provides the technical basis for the emergency despondence, in order to ensure that rescue workers reach the extreme earthquake area with search and rescue operations timely and accurately, and to reduce the casualties and property loss. In this paper, we introduced 7 intensity algorithms and compared the results from the records of Jiuzhaigou M_S7.0 earthquake. We found that the differences between the instrumental intensities calculated by each method and the macro intensities were within 1-degree range, which suggested good practicality of these different methods. The results calculated by the calculation code method and the integrated test showed good consistence.