The US Geological Survey registered the two strongest of the quakes at 5.6 magnitude.

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The US Geological Service measured the quakes at magnitude 6.4 and 6.3.

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Two major quakes in Iran on Saturday killed at least 300 and left widespread destruction with thousands injured.

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The study also said the "likely cause" of the quakes was an "unusual combination of geology at the well site" and said conditions which caused the minor earthquakes were "unlikely to occur again".

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At a depth of less than 10 kilometers (6 miles), both quakes were shallow.

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