The quake, initially reported as a magnitude 6.0, struck at 5:21 a.m. on Wednesday (2121 GMT on Tuesday). It was very shallow, at a depth of 4 miles (6 km), which would have amplified its effect. Its epicentre was 47 miles (75.5 km) northeast of Cotabato on the large southern island of Mindanao.
A magnitude 5.6 quake is considered moderate and is capable of causing considerable damage.
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