Earthquake energy can travel vast distances, shaking the ground far from its origin. This energy moves even more swiftly along tectonic plate boundaries and across their intersections. When powerful earthquakes struck along the East Anatolian Fault in February 2023, between Syria and Turkey, their impact was expected to extend along the Dead Sea Fault, from the Red Sea to Turkey, and affect its surrounding regions. These significant faults are well-known as intersecting plate boundaries.
Nonetheless, the anticipated strong earthquakes did not occur along the Dead Sea Fault.
While this may seem like an anomaly, researchers from the School of Environmental Sciences at the University of Haifa and the Geological Survey of Israel claim that the initial perception was wrong, claiming that the plate boundaries are not connected.
“Our study shows that the strong earthquakes of the East Anatolian Fault were not channeled along the Dead Sea Fault since they are not tectonically connected, as most scientists assume. The seismic energy produced by the source is absorbed through small aftershocks in the intermediate regions – i.e., in Syria and Lebanon, but not preferably channeled along the Dead Sea Fault ” explained Prof. Uri Schattner of the University of Haifa, one of the authors of the study.
In February 2023, some of the strongest earthquakes in the history of the Middle East occurred in southeast Turkey, killing tens of thousands of people. The current study, published recently in the journal Tectonophysics, was conducted jointly with Dr. Amit Segev and Dr. Nadav Wetzler from the Geological Survey of Israel. The researchers sought to examine why the major earthquakes in Turkey did not cause significant aftershocks along the Dead Sea Fault and the countries along its 1000+ km trace.
They gathered the earthquake data from the Israeli and Turkish seismic monitoring networks, collected between 2000-2022 from Eilat to Turkey and in all the neighboring countries, and analyzed all their seismological components. The researchers also reviewed all previous geological, geophysical, volcanic and tectonic studies to better understand the Dead Sea fault development in the past millions of years. “We wanted to go back to square one and re-examine if these two major fault systems are actually connected,” explained Dr. Segev.
The findings confirm the northward development of the Dead Sea Fault, gradually separating between the Sinai and the Arabian plate over millions of years. However, they show an interesting trend. The modern earthquakes are concentrated along the southern portion of the fault, from the Red Sea to the Sea of Galilee, where the cumulative displacement is 105 km between Sinai and Arabia (the east side is moving north relative to the western side). From Lebanon northwards, earthquakes occur across a much wider area, including the Syrian Palmyra and Aleppo regions. In these areas, displacement along the Dead Sea Fault diminishes significantly—around 16-4 km in northwestern Syria—and is absent at its supposed junction with the East Anatolian Fault.
“This finding enhances our understanding of how seismic energy dissipates in earthquake-prone areas. It may help improve our preparedness for seismic events by showing that the Dead Sea Fault is not directly connected to the East Anatolian Fault. This finding is critical in managing seismic risk in our region and raises new questions concerning the type of earthquakes that may occur in northern Israel,” noted Dr. Wetzler from the Seismological Division of the Geological Survey of Israel.
The researchers add that the meeting area between the Dead Sea and East Anatolian Faults may be considered a natural laboratory for studying the processes in which tectonic junctions are formed between plate boundaries. “A plate boundary such as the Dead Sea Fault can be found in many other places, such as the San Andreas Fault in California. They are part of the global tectonic network of plate boundaries. Our study shows how a plate boundary junction is created,” Dr. Segev explained.
“Our findings enhance our understanding of crustal structures across the Middle East,” concluded the researchers. “This knowledge provides better tools for assessing earthquake distribution and propagation, marking a significant step towards improving regional seismic risk and hazard assessment”.
