In the lead up to the sinkhole that appeared in Hakata last November, warning signs that a sinkhole might occur were not communicated to Fukuoka City. The Taisei Corporation JV, which was measuring rock pressure at the time, failed to report significant increases in pressure in the lead up to the sinkhole. The rock pressure began to rise the day before the sinkhole occurred, with a level 1 warning (caution) at 6pm the evening before, level 2 (warning) by 1am on Nov. 8 and a level 3 pressure reading (strong warning) thirty minutes before the sinkhole occured. The warnings were passed to the city four minutes after the sinkhole formed. Source: Asahi Shinbun, 1/24
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