Clustered Microearthquake Swarm Recorded South of Istanbul's Princes' Islands

 

Clustered Microearthquake Swarm Recorded South of Istanbul's Princes' Islands

Between August 18 and August 20, 2026, Boğaziçi University’s Kandilli Observatory and Earthquake Research Institute (KRDAE) along with the Disaster and Emergency Management Presidency (AFAD) registered a microearthquake swarm in the Sea of Marmara. Kandilli identified 117 seismic events ranging from magnitude 0.7 to 3.1 within a 20-kilometer radius south of the Princes' Islands. Concurrently, AFAD documented over 30 tremors in a 24-hour window, with the peak event measuring magnitude 3.2 at focal depths ranging between 7 and 17 kilometers.

According to seismological assessments, the recorded events exhibited normal-component oblique strike-slip mechanisms consistent with the active geometry of the North Anatolian Fault system under the Sea of Marmara. Geologists have noted that microearthquake clusters are typical in active tectonic settings, and 24/7 monitoring continues via regional observation centers.

Sources:

• Turkish Minute: Turkish observatory records 117 microearthquakes south of İstanbul in 55 hours

• Türkiye Today: Kandilli records 117 earthquakes south of Istanbul's Princes' Islands in 2 days

• Türkiye Today: Quake swarm shakes Istanbul with over 30 tremors in 24 hours

Six Buildings Evacuated as Heavy Rains Trigger Istanbul Landslide

 

Six Buildings Evacuated as Heavy Rains Trigger Istanbul Landslide

Severe weather conditions in Istanbul have resulted in a localized landslide. Following intense and heavy rainfall, the structural integrity of several residential foundations was threatened, prompting immediate intervention by local emergency services.

As a strict precautionary measure, authorities successfully evacuated and sealed a total of six buildings in the affected zone to prevent potential casualties. The incident underscores the city's ongoing vulnerability to extreme weather events and highlights the importance of the region's flood and landslide risk mapping.

Source:

• Türkiye Today