摘要
地震动参数是评定地震时地震烈度的参考依据,是烈度表的重要组成部分,尤其是在缺乏某些地震灾害判别现象的地区,地震动参数就成为非常有效的判别标准之一。对岷漳地震震区及周边获取的地震动记录进行处理和计算分析,得到水平向、三分向合成地震动参数和地震仪器烈度值;分别开展基于水平向地震动参数、三分向合成地震动参数和地震仪器烈度的烈度评定;探讨三种烈度评定方法对烈度评定结果的影响规律,从地震动参数定量参考指标角度验证现行地震烈度表与原有烈度表的一致性与差异性。结果表明:基于三分向合成地震动参数和地震仪器烈度的评定过程更为规范,结果更加具体和准确;基于三分向合成地震动参数和地震仪器烈度的烈度评定结果与实际宏观地震烈度符合良好,相差±1度以内的占比55%,相差±2度以内的占比91%,完全吻合率较之水平向地震动参数的烈度评定结果提高了18%。研究对于更加客观和科学地评定地震烈度具有重要意义和实用价值。
With the accumulation of earthquake damage experience,the deepening understanding of earthquakes,and the development of seismic observation instruments,researchers have persistently pursued the continuous modification of intensity standards to make intensity evaluations more objec-tive and scientific.Ground motion parameters serve as a reference basis for assessing the seismic inten-sity of an earthquake and are an important component of seismic intensity scales.They are particularly effective in regions lacking certain seismic disaster discrimination phenomena.This paper processed and analyzed ground motion records obtained from the Minxian-Zhangxian Earthquake region and its surroundings to obtain horizontal,three-component synthetic ground motion parameters and seismic instrument intensity values.They study conducted seismic intensity evaluations based on horizontal ground motion parameters,three-component synthetic ground motion parameters,and seismic instru-ment intensity.It explored the influence of the three intensity evaluation methods on the results,veri-fying the consistency and differences between the current seismic intensity scale and the original inten-sity scale from the perspective of quantitative reference indicators of ground motion parameters.The results showed that:(1)The evaluation process based on three-component synthetic ground motion pa-rameters and seismic instrument intensity was more standardized,with results being more specific and accurate.(2)The intensity evaluation results based on three-component synthetic ground motion pa-rameters and seismic instrument intensity closely matched the actual macroseismic intensity,with 55%of the evaluations differing by±1 degree and 91%differing by±2 degrees.(3)The complete match rate improved by 18%compared to the intensity evaluation results based on horizontal ground motion parameters.This research holds significant importance and practical value for more objective and scientific seismic intensity evaluations.
作者
夏坤
肖雪
董林
吴平川
崔赞涛
XIA Kun;XIAO Xue;DONG Lin;WU Pingchuan;CUI Zantao(School of Civil Engineering,Hebei University of Engineering,Handan 056038,China)
出处
《防灾减灾工程学报》
CSCD
北大核心
2024年第4期960-968,共9页
Journal of Disaster Prevention and Mitigation Engineering
基金
国家自然科学基金(52278171)资助。
关键词
地震烈度评定
地震动参数
仪器地震烈度
宏观地震烈度
岷漳地震
seismic intensity evaluation
ground motion parameter
instrumental seismic intensity
mac-roseismic intensity
Minxian-Zhangxian Earthquake
作者简介
夏坤(1985-),女,副研究员,硕导,博士。主要从事防震减灾等方面的研究。E-mail:xiakunxiakun@163.com。
