| Autor: |
Chen, Jianquan, Liu, Chang, Dal Zilio, Luca, Cao, Jianling, Wang, Hui, Yang, Guangliang, Göğüş, Oğuz H., Zhang, Hang, Shi, Yaolin |
| Předmět: |
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| Zdroj: |
Journal of Geophysical Research. Solid Earth; Oct2024, Vol. 129 Issue 10, p1-21, 21p |
| Abstrakt: |
Earthquake interaction across multiple time scales can reveal complex stress evolution and rupture patterns. Here, we investigate the role of static stress change in the 2023 Mw 7.8 and 7.6 earthquake doublet along the East Anatolian Fault (EAF), using simulations of 19 historical earthquakes (M ≥ 6.1) and the 2023 earthquake doublet from 1822 to 2023. Focusing on six cascading sub‐events during the 2023 Kahramanmaraş earthquake doublet, we reveal how one sub‐event's stress alteration can impact the emergence and rupture of subsequent sub‐events. Our analysis unveils that the 2023 Mw 7.8 earthquake was delayed due to stress shadow effects from historical events, while the 2023 Mw 7.6 earthquake was accelerated as a result of stress increases from historical events and ultimately triggered by the 2023 Mw 7.8 earthquake. This study underscores the importance of grasping earthquake preparation, rupture initiation, propagation, and termination in the context of intricate fault systems worldwide. Based on these results, we draw attention to increased seismic hazards in the Elazig‐Bingol seismic gap of the EAF and the northern section of the Dead Sea Fault (DSF), necessitating increased monitoring and preparedness efforts. Plain Language Summary: On 6 February 2023, a doublet of earthquakes (Mw 7.8 and 7.6) struck the borders between southeastern Turkey and northern Syria. Aiming to discover the influence of past earthquakes on the initiation, propagation, and termination of the doublet, as well as the prospective seismic hazards of the seismic gaps in the targeted region, we demonstrated spatiotemporal variations in stress along the EAF before, during, and after 2023 using the earthquake data during the past two centuries. We revealed how the stress changes induced by one sub‐event can influence the occurrence and behavior of subsequent sub‐events, and consequently on how the rupture process evolves over time and space. Our research is crucial for gaining insights into underlying mechanisms governing earthquake preparation, rupturing and propagation in earthquake sequences, and migration within the EAF. We also suggest special attention should be paid to the raised seismic hazards between the Palu and Ilica cities in the Elazig‐Bingol seismic gap of the EAF and the northern section of the DSF due to stress loading. This might be helpful in the development of effective strategies for disaster prevention and relief in the regions of southeastern Turkey, northern Syria, and Lebanon. Key Points: The 2023 Mw 7.8 earthquake was delayed due to stress shadow caused by historical earthquakes between 1822 and 2023The 2023 Mw 7.6 earthquake was promoted caused by historical earthquakes and finally triggered by the 2023 Mw 7.8 earthquakeSpecial attention should be paid to the raised seismic hazards in the seismic gap of the northeastern EAF and the northern DSF [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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