岩土工程学报2026，Vol.48Issue(5)：929-938,10.DOI:10.11779/CJGE20250168
2022年日本福岛Mw7.4级地震的S-net海底场地非线性反应研究
Nonlinear response of S-net sites in 2022 Mw7.4 off-Fukushima earthquake,Japan
摘要
Abstract
To investigate the seismic nonlinear response of seafloor sites,this study analyzes S-net seafloor strong-motion records from the Mw7.4 off-Fukushima earthquake on March 16,2022.Horizontal-to-vertical spectral ratios(HVSR)are compared between strong motions(PGA≥100 cm/s²)and weak motions(20 cm/s²<PGA<100 cm/s²).Three nonlinear site parameters(DNL,ADNL,PNL)are examined to evaluate nonlinearity at 148 ocean bottom stations(OBSs),and regression analysis is conducted on their relations with PGA and PGV for buried and unburied OBSs.Results show that when horizontal PGA exceeded 100 cm/s²,some OBSs exhibit clear nonlinear features,including dominant frequency shift to lower frequencies and spectral ratio reduction at high frequencies.All three parameters correlate well with PGA and PGV;PNL is more suitable for nonlinearity identification at S-net sites,while DNL and ADNL thresholds for offshore sites require reassessment.The setting condition of OBSs significantly affects nonlinearity assessment,suggesting buried and non-buried OBSs should be analyzed separately.关键词
Mw7.4级福岛海域地震/海底地震动/非线性反应/HVSR/S-netKey words
Mw7.4 off-Fukushima earthquake/seafloor ground motion/nonlinear response/HVSR/S-net分类
建筑与水利引用本文复制引用
胡进军,李建华,崔鑫..2022年日本福岛Mw7.4级地震的S-net海底场地非线性反应研究[J].岩土工程学报,2026,48(5):929-938,10.基金项目
国家重点研发计划项目(2021YFC3100701,2022YFC3003503) （2021YFC3100701,2022YFC3003503）
国家自然科学基金项目(52478568)This work was supported by the National Key R&D Program of China(Grant Nos.2021YFC3100701,2022YFC3003503)and National Natural Science Foundation of China(Grant No.52478568) （52478568）
