U.S., April 23 -- Today's massive earthquake beneath the Sea of Marmara sent tremors throughout the region, including Turkiye's largest city, Istanbul.

Turkiye's Disaster and Emergency Authority (AFAD) reported that two seismic events were recorded after midday local time, with the more intense quake registering a magnitude of 6.2 - marking the most substantial seismic activity to affect the city of over 15 million residents in several years.

Although there were no immediate reports of damage or injuries, videos shared online seemingly depict the quake's disturbing impact from distances of up to 80km (50 miles) away.

Some footage from interior cameras reveals lanterns swaying and decorations falling from shelves as the surroundings sho...