2023年2月6日土耳其双震地震动显著持时特征  

Ground-motion Significant Duration Characteristic of the Double Earthquakes on February 6, 2023 in Turkey

作　　者：李培旭 胡进军[1,2] 赵一男 丁龙兵 刘巴黎 Li Peixu;Hu Jinjun;Zhao Yinan;Ding Longbing;Liu Bali(Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;Key Laboratory of Earthquake Engineering and Engineering Vibration of China Earthquake Administration,Harbin 150080,China)

机构地区：[1]中国地震局工程力学研究所,哈尔滨150080 [2]中国地震局地震工程与工程振动重点实验室,哈尔滨150080

出　　处：《震灾防御技术》2024年第3期446-456,共11页Technology for Earthquake Disaster Prevention

基　　金：国家重点研发计划(2022YFC3003503、2021YFC3100701)。

摘　　要：2023年2月6日土耳其东安纳托利亚断裂带连续发生2次M_(W)7.8、M_(W)7.5强震,震害调查表明地震序列下工程结构更易发生破坏。本研究选取2次强震中台站记录的311组地震动数据,通过随机效应回归方法给出了土耳其双震下水平及竖直方向5%~75%显著持时D_(S5-75)和5%~95%显著持时D_(S5-95)回归模型,与现有研究结果进行比较,验证了本研究回归模型的合理性。研究结果表明,土耳其2次地震竖直方向D_(S5-75)和D_(S5-95)均明显高于水平方向,断层距>10 km时显著持时回归结果随断层距增大速率大于其他模型。本研究得到的地震动水平和竖直方向显著持时特征可为此次土耳其双震部分震害特征提供合理解释,同时表明了地震动竖向显著持时研究的重要性,可为序列型地震显著持时研究提供参考。On February 6,2023,two major earthquakes with magnitudes M_(W)7.8 and M_(W)7.5 struck the East Anatolia fault zone in Turkey.Engineering structures are more susceptible to failure during earthquake sequences,as observed in seismic damage investigations.In this study,we developed a ground-motion regression model that incorporates duration parameters for the 5%~75%significant duration(D_(S5-75))and the 5%~95%significant duration(D_(S5-95)),using 311 datasets and applying the random effects regression method.The validity of the prediction equations was verified by comparing them with existing research results.Our findings indicate that the D_(S5-75) and D_(S5-95) values for the vertical component are significantly higher than those for the horizontal component in both earthquakes.Additionally,the growth rate of the predicted results increases more rapidly with rupture distance beyond 10 km when compared to other models.The developed prediction equations and comparative results offer insights into the seismic damage assessments for the Turkey earthquakes.The characteristics of significant duration in both horizontal and vertical ground motions presented in this paper help explain some aspects of the observed seismic damage.These findings also underscore the importance of studying the vertical significant duration of ground motion,providing a valuable reference for future research on significant duration in earthquake sequences.

关 键 词：土耳其双震 地震动 显著持时 断层距 剪切波速 回归模型 

分 类 号：P315[天文地球—地震学]