Jakarta, Oct. 10 -- Indonesia's tsunami early detection system effectively recorded sea level changes in North Sulawesi following a 7.4-magnitude earthquake in the Philippine Sea on Friday, confirming the system's accuracy in monitoring tsunami activity.

Daryono, Director of Earthquakes and Tsunamis at the Meteorology, Climatology, and Geophysics Agency (BMKG), said the agency's tsunami gauge network detected sea level changes minutes after the quake struck at 8:43 a.m. Western Indonesian Time (UTC+7).

Within 30 minutes, gauges in Essang, Beo, Melonguane, Ganalo, Sangihe, Morotai, and West Halmahera recorded anomalies ranging from 5 to 17 centimeters.

"The event is categorized as a minor tsunami, and the system successfully verified th...