Scientists Map a Previously Invisible Fault Structure That May Trigger a Major Earthquake

Key Points:

• A new 3D electromagnetic model of the Marmara Sea region reveals detailed underground rock properties, highlighting zones of stress accumulation along the North Anatolian Fault (NAF) that could indicate where future major earthquakes might start.
• Türkiye's location at the convergence of four tectonic plates has historically caused destructive earthquakes, with a notable westward progression of quakes along the NAF, making the Marmara Sea segment a critical area of concern after over 250 years without a large quake.
• The model, developed using data from over 20 magnetotelluric stations, identifies contrasting zones of electrical resistivity that correspond to mechanically weak, fluid-rich areas and stronger, locked fault segments where stress is likely building.
• Stress concentration appears strongest at boundaries between weak and strong rock zones, suggesting these areas as probable initiation points for future earthquakes, information that could improve disaster preparedness in Istanbul and surrounding regions.
• While the study advances understanding of fault mechanics and potential earthquake locations, it does not provide precise predictions on the timing of the next major seismic event, reflecting ongoing challenges in earthquake forecasting.