By Mehdi Zare, professor at earthquake prediction center, IIEES

6.2 earthquake in the Sea of Marmara and warning of a major earthquake in Istanbul

TEHRAN - A strong earthquake with a magnitude of 6.2 in the Sea of Marmara, 40 km from Istanbul, Turkiye, shook at 12:49 pm local time on April 23, 2025. All thirty-three stations of the IIEES Iranian broadband seismic network of the International Institute of Seismology and Earthquake Engineering throughout Iran recorded this earthquake. The mechanism of the earthquake is strike-slip, and the epicenter of the earthquake is located at a depth of approximately 10 km and about 40 km southwest of Istanbul within the Sea of Marmara.