Characteristics of strong ground motion from the 2023 Mw 7.8 and Mw 7.6 Kahramanmaraş earthquake sequence

Jinjun Hu*, Mingji Liu, Tuncay Taymaz, Longbing Ding, Tahir Serkan Irmak

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

On the 6th February 2023 Mw 7.8 and Mw 7.6 Kahramanmaraş Earthquake Sequence occurred at the East Anatolian Fault Zone (EAFZ) and the Sürgü-Çardak Fault Zone (SCFZ), causing significant damage to buildings and infrastructure in southeast-central Türkiye and northern Syria, and claiming the lives of > 50,000 of people. We use the strong ground motion records provided by the Disaster and Emergency Management Presidency of Türkiye (AFAD) to discuss the characteristics of response spectra of interested stations, to identify and analyze the pulse-like ground motion records in the earthquake doublet, and compare the PGA, PGV, spectral acceleration and significant duration with the relevant prediction models. It is found that pulse-like ground motions are mainly distributed on the fault zone, and the velocity pulses are characterized by short-duration, short-period, and high-amplitude. The smaller pulse period may be due to the small proportion of low-frequency content energy of pulse-like ground motions. The residuals of the empirical model increase with the increase of VS30, implying that the regional duration model needs to be further studied. The existing models significantly overestimates the significant duration of pulse-like ground motion records, which may be related to the directional effect of pulse-like ground motion. The existing model has well predicted the attenuation of ground motion for short periods, while the ground motion records in Türkiye attenuated faster for the larger distances (> 120 km). Due to the presence of many large-amplitude, long-period velocity pulse-like records in the near-fault, PGV and long-period response spectra of pulse-like ground motion records are underestimated by the existing model. The complex dynamics of the 2023 sequence justify further studies.

Original languageEnglish
JournalBulletin of Earthquake Engineering
DOIs
Publication statusAccepted/In press - 2024

Bibliographical note

Publisher Copyright:
© 2024, The Author(s), under exclusive licence to Springer Nature B.V.

Funding

This study was supported by the Basic Science Research Foundation of the Institute of Engineering Mechanics, China Earthquake Administration (Grant Number 2021EEEVL0103) and National Natural Science Foundation of China (52078470; U1939210). This work was supported by the Basic Science Research Foundation of the Institute of Engineering Mechanics, China Earthquake Administration (Grant Number. 2021EEEVL0103) and the National Natural Science Foundation of China (Grant Number. U1939210). We would like to acknowledge the Disaster and Emergency Management Presidency of Türkiye (AFAD) for setting up a dense near-fault observatories of strong ground motion network and for immediately publishing a huge number of openly accessible accelerometers during the catastrophic times for Türkiye. Tuncay Taymaz acknowledges support by Istanbul Technical University Research Fund (ITU-BAP) as well as Turkish Academy of Sciences (TÜBA-GEBİP) and the Alexander von Humboldt Foundation Research Fellowship Award through the Humboldt-Stiftung Follow-Up Program. TT also thanks Dr. Beyza Taymaz for her phenomenal support and assistance during hectic days dealing with global media requests and organizing international scientific collaborations and for her guidance and discussions during four-weeks of sleepless nights. We wish to thank Berkan Özkan for his help collecting the strong ground motion recordings, the anonymous reviewers and the editors for constructive and judicial comments.

FundersFunder number
Humboldt-Stiftung Follow-Up Program
TÜBA-GEBİP
Alexander von Humboldt-Stiftung
National Natural Science Foundation of China52078470, U1939210
Türkiye Bilimler Akademisi
Istanbul Teknik Üniversitesi
Institute of Engineering Mechanics, China Earthquake Administration2021EEEVL0103
Bilimsel Araştırma Projeleri Birimi, İstanbul Teknik Üniversitesi

    Keywords

    • Pulse-like ground motion
    • Significant duration
    • Spectral acceleration
    • Strong-ground motion records
    • The 2023 Kahramanmaraş earthquake sequence

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