Article detail · 2021
The moderate size 2019 September Mw 5.8 Silivri earthquake unveils the complexity of the Main Marmara Fault shear zone
- Year
- 2021
- Type
- article
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- YÖKSİS YÖKSİS article record
- YÖKSİS venue Geophysical Journal International
- Catalog match (ISSN) Geophysical Journal International
- OpenAlex OpenAlex enrichment (abstract, citations, topics)
Abstract
OpenAlex · English
SUMMARY The unbroken section of the North Anatolian Fault beneath the Sea of Marmara is a major source of seismic hazard for the city of İstanbul. The northern and currently the most active branch, the Main Marmara Fault (MMF), is segmented within a shear zone and exhibits both partially creeping and locked behaviour along its 150 km length. In 2019 September, a seismic activity initiated near MMF, off-coast the town of Silivri, generating 14 earthquakes ≥ Mw 3.5 in a week. The Mw 5.8 Silivri earthquake, is the largest in the Marmara Sea since the 1963 Mw 6.3 Çınarcık earthquake. Our analyses reveal that the activity started in a narrow zone (∼100 m) and spread to ∼7 km following an Mw 4.7 foreshock within ∼2 d. The distribution of relocated aftershocks and the focal mechanisms computed from regional waveforms reveal that the Mw 5.8 earthquake did not occur on the MMF, but it ruptured ∼60° north-dipping oblique strike-slip fault with significant thrust component located on the north of the MMF. Finite-fault slip model of the main shock shows 8 km long rupture with directivity toward east, where the ruptured fault merges to the MMF. The narrow depth range of the slip distribution (10–13 km) and the aftershock zone imply that the causative fault is below the deep sedimentary cover of the Marmara Basin. The distribution of aftershocks of the Mw 5.8 event is consistent with Coulomb stress increase. The stress changes along MMF include zones of both stress decrease due to clamping and right-lateral slip, and stress increase due to loading.
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Citations
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51 citations
OpenAlex cited_by_count (cache / database)
41 publications in the local catalog that cite this work (OpenAlex reference match; not the full global list).
- The Effect of Site-Specific Design Spectrum on Earthquake-Building Parameters: A Case Study from the Marmara Region (NW Turkey) 2020
- The Effect of Site-Specific Design Spectrum on Earthquake-Building Parameters: A Case Study from the Marmara Region (NW Turkey). 2020
- An updated strong-motion database of Türkiye (SMD-TR) 2024
- Stress change generated by the 2019 İstanbul–Silivri earthquakes along the complex structure of the North Anatolian Fault in the Marmara Sea 2022
- Stress change generated by the 2019 Istanbul-Silivri earthquakes along the complex structure of the North Anatolian Fault in the Marmara Sea 2022
- Coseismic Faulting Complexity of the 2019 Mw 5.7 Silivri Earthquake in the Central Marmara Seismic Gap, Offshore Istanbul 2022
- Statistical and seismotectonic analyses of the Marmara region under existing stress regime in the west of the NAFZ 2025
- Statistical and seismotectonic analyses of the Marmara region under existing stress regime in the west of the NAFZ 2025
- Statistical and seismotectonic analyses of the Marmara region under existing stress regime in the west of the NAFZ 2025
- Analyzing the October 16, 2024 MW 5.9 Kale (Malatya) earthquake in relation to the February 2023 Kahramanmaraş earthquake sequence and local tectonic dynamics 2025