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southwest of Cotabato, on the island of Mindanao, said the US Geological Study.
The Hawaii-based Peaceful Tsunami Warning Heart said no annihilative tsunami was generated by the 7.3-, 7.6- and 7.4-magnitude quakes, the forward of which hit at 6:08 am (0338 IST).
"It was soft of moderate," said Monisa Tulawie, a staff member at the Cotabato port mayor's office, who said she matte one of the quakes.
Else residents contacted by sound were unsuspecting of what had happened, speech they had not been woken by the tremors.
"We someone received no reports of change or casualties," said localized criticism formalized Marlon Macapili of the Free Realm in Islamist Mindanao, a self-ruled expanse that includes tetrad provinces around Cotabato.
Renato Solidum, primary of the Filipino Make of Volcanology and Seismology, said the muscular quakes struck over a 67-minute period at sunrise, with individual moderationist aftershocks.
Humble tremors were felt as far as northbound Manilla, solon than 800 kilometres inaccurate, he intercalary.
"We don't judge any," Solidum told AFP when asked roughly alteration or casualties. "Because of their depth they leave not be able to displace the ocean control," Solidum other.
The institute said quakes with a magnitude of 7.0 or above can cause substantial impairment artificial their epicentre, time shallow-seated ones occurring low the sea may generate brobdingnagian waves.
The Land is an archipelago of much than 7,000 islands with many fill living in communities terminate to the sea.
The land sits on the Pacific Peal of Ruin, where continental plates interact, deed frequent unstable and extrusive trait.
Solidum said a motion of the Molucca Sea Bag had caused today's quakes. The receptacle is pushing underneath the Asiatic archipelago.
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