A magnitude 6.9 earthquake shook Philippines' Moro Gulf and followed by at least four consecutive strong aftershocks that shook the same area on Saturday morning, according to the Philippine Institute of Volcanology and Seismology.
In May 2010, a 6.0 magnitude earthquake also shook the Moro Gulf that had a 21 miles depth, but today, it was 376 miles below the surface.
The first quake occurred at 6.08 a.m. (local time) at magnitude 6.9, followed by the first aftershock at 6:51 a.m with a magnitude of 6.7. The epicenter of the quakes were around 62 miles (100 km) southwest of Cotabato and 590 miles (950 km) southeast of Manila.
The second aftershock was recorded at 7:15 a.m with a magnitude of 7.1.
Possible cause of powerful quakes might be the deformation of the subducted slab of the Molucca Sea Plate, according to Phivolcs.
Rona Faeldin, of the Philippine Coast Guard, said that there were no reports of damage or injuries.
The United States Geological Survey (USGS) records the aftershocks.
USGS measured the second aftershock at magnitude 7.4; the third was recorded at 9:44 a.m., with a magnitude of 5.3; and the fourth was recorded at 1:35 p.m., with a magnitude of 6.2.
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