Philippine authorities are scrambling to map out previously unknown fault lines across the archipelago after a powerful 6.9 magnitude quake flattened villages, twisted roads and killed dozens in the country's central island of Negros earlier this month. Experts believe the quake on 6 February was caused by the movement of a "blind fault line" - or a previously unknown fault line - under a narrow strait between Negros and the island of Cebu, catching disaster response officials by surprise. Read More

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