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Wood-Stove Sparks Seen as Likely Trigger in Ōfunato Wildfire but Cause Remains Unconfirmed

Despite detailed field analysis accompanied by reconstruction tests, the investigation could not confirm a precise ignition mechanism after eliminating multiple potential causes

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Overview

  • The Fire and Disaster Management Agency published its official report on July 15 regarding the February Ōfunato forest fire.
  • Investigators identified a heavily charred stump in the Akasaki-cho Attari area as the likely point of origin.
  • The agency dismissed electrical equipment, wiring faults, on-site bonfires and discarded cigarette remnants as ignition sources due to lack of burn traces.
  • A reproduction experiment involving a wood-burning stove chimney located about 20 meters from the stump indicated the highest relative likelihood for spark-driven ignition.
  • The wildfire claimed one life and damaged 222 buildings, including 87 houses, marking one of the most severe recent wildfires in the region.