Indonesia built its government seat in mapped volcano hazard zone: Now it must move
Indonesia's national geological authority has formally recommended that Solok Regency move its entire government campus away from the path of an active volcano's debris flows — nineteen years after the agency's own hazard maps placed that campus squarely inside a lahar danger zone.
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The finding that now runs through the geological agency's October 5 PVMBG investigation report is not that a freak disaster struck a well-sited city. It is that Indonesia built — and kept operating — a regional seat of government in the direct path of a hazard its own scientists had documented and mapped two decades earlier.
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According to the Badan Geologi investigation, rainfall had been saturating the slopes since September 19. Debris accumulated at the confluence of two main drainage valleys on Gunung Talang's western flank. A natural dam formed. Then it failed. The resulting torrent reached Arosuka at approximately 7:53 PM local time,
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The relocation recommendation is significant in its own right. But the larger implication of the Arosuka disaster is one the report does not fully articulate: relocation alone does not eliminate the underlying risk if the upstream watershed continues to lose forest cover and deliver increasing volumes of debris material into the drainage system.
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