防灾减灾工程学报2025，Vol.45Issue(2)：338-348,11.DOI:10.13409/j.cnki.jdpme.20240417003
2023年2月6日土耳其MW7.8和MW7.5地震序列近断层速度脉冲变化特征及震源影响分析
Analysis of Variation Characteristics of Near-Fault Velocity Pulses and Source Effect in MW 7.8 and MW 7.5 Turkey Earthquake Sequence on February 6,2023
摘要
Abstract
On February 6,2023,two strong earthquakes with magnitudes of MW7.8 and MW7.5 oc-curred along the East Anatolian Fault Zone in southeastern Turkey.Large near-fault velocity pulses were observed during both major earthquakes occurring on the same fault zone within one day.This study investigated the characteristics of pulse-type ground motions and the effects of the source of the Turkish earthquake sequence.First,horizontal-component ground motions recorded during the two earthquakes were collected,and 28 and 8 velocity pulse records were extracted,respectively,using a wavelet-based identification algorithm.The spatial distribution characteristics of the pulse records,as well as the variations in parameters such as velocity pulse period and response spectrum amplification factors,were analyzed.By comparing these results with empirical relationships for pulse parameters,the individual characteristics of the Turkish earthquakes were discussed.Subsequently,velocity pulses observed at the same stations during both earthquakes were compared to explore the effect of source rupture process on velocity pulses.The results showed significant variations in velocity pulses of the two earthquakes,with pulse periods notably differing from previous empirical relationships due to complex source effects.The response spectrum amplification factors by pulses ranged from 1.8 to 7.5.Most pulse-recording stations were located in areas adjacent to the fault,and pulse periods exhibited increasing trends with fault distance.Source slip distribution had a significant effect on the characteris-tics of near-fault velocity pulses.These findings contribute to a deeper understanding of the relation-ship between near-fault velocity pulses and source,providing scientific references for establishing pre-diction models for near-fault velocity pulses and determining seismic inputs for pulse-type ground mo-tions in earthquake-resistant engineering.关键词
土耳其地震/脉冲型地震动/震源/脉冲周期/反应谱放大系数Key words
Turkey earthquake/pulse-type ground motion/earthquake source/pulse period/response spectrum amplification factor分类
地球科学引用本文复制引用
党志颖,曹泽林,王可意,孙志宇..2023年2月6日土耳其MW7.8和MW7.5地震序列近断层速度脉冲变化特征及震源影响分析[J].防灾减灾工程学报,2025,45(2):338-348,11.基金项目
河北省地震灾害防御与风险评价重点实验室开放基金项目(FZ247102)、河北省自然科学基金(E2022402077)、国家自然科学基金(52308495)、河北省教育厅科学研究项目(BJK2023062)资助 （FZ247102）
