Three major earthquakes have struck the Moro Gulf in the Philippines this morning.
Saturday 24th July 2010
Three deep magnitude 7 earthquakes have struck beneath the Moro Gulf off the southern coast of Mindanao this morning.
The first event was a magnitude 7.3 quake which struck at 10:08 this morning, New Zealand time. The quake was located 100 km south-west of Cotabato, Mindanao (120 km south of Pagadian) at a depth of 605 km according to the U.S. Geological Survey.
Geoscience Australia reports this quake as magnitude 7.2 at a depth of 610 km. It estimates that the quake would have caused damage within 120 km of the epicentre, which includes south-western parts of Mindanao, and would have been felt up to 1500 km away.
At 10:51 New Zealand time, a magnitude 7.4 quake struck the same area. This event was centred 115 km south-west of Cotabato (150 km south of Pagadian) at a depth of 575 km according to the U.S. Geological Survey.
Geoscience Australia reports this earthquake as magnitude 7.5 at a depth of 585 km. It estimates that damage would have been caused within 160 km of the epicentre and the event would have been felt up to 2000 km away.
Another major quake struck the area at 11:15 this morning. The U.S. Geological Survey reports that this magnitude 7.4 quake was located 121 km west-south-west of Cotabato (123 km south-south-west of Pagadian) at a depth of 617 km..
Geoscience Australia reports this event as magnitude 7.4 at a depth of 620 km. Their calculated epicentre is closer to shore than the previous quakes indicating damage, expected within 150 km of the epicentre, would have been experienced on the Moro Gulf coast south of Pagadian and on the gulf-facing south-western parts of Mindanao. This quake would have been felt up to 1850 km from the epicentre.
The Pacific Tsunami Warning Centre reported the quakes as magnitude 7.1, 7.3 and 7.2 respectively. In bulletins issued for each event it advised that, based on the nature of the quakes and historical data, a destructive tsunami was not generated by any of the quakes.
The Japan Meteorological Agency has not issued warnings or advisories based on these earthquakes.
Traces from all three events showed clearly on New Zealand’s seismograph network.
[Compiled from data supplied by the U.S. Geological Survey, Geoscience Australia the Pacific Tsunami Warning Centre, and their contributing agencies.]