MANILA, July 11 (Xinhua) -- The Philippine Institute of Volcanology and Seismology revised the magnitude of the offshore earthquake that rattled Sultan Kudarat province in the southern Philippines on Thursday morning to 7.1 from 6.5.
The institute initially reported the earthquake, which occurred at 10:13 a.m. local time, as magnitude 6.5.
In an updated report, the institute said the quake hit at a depth of 722 kilometers, about 133 kilometers southwest of Palimbang, a coastal town.
The tremor was also felt in nearby provinces on Mindanao, the country's second-largest island, including Davao Occidental, Davao Oriental, Sarangani, Davao de Oro, Davao del Norte and Cotabato.
The institute said the tectonic quake will trigger aftershocks but will not cause damage. It added that the earthquake will not trigger a tsunami.
The archipelagic Philippines has frequent seismic activities due to its location along the Pacific "Ring of Fire." ■
