Abstract
The amount of water drainage from Kushiro Coal Mine in Hokkaido, Japan decreased on the day of all M ≥ 7.5 earthquakes with epicenters within 300 km of the mine during the monitoring period and increased after these earthquakes. This is a valuable finding which would give us a clue to understand pre- and post-seismic rockmass behaviors and contribute for progress in earthquake prediction in future.
Highlights
Kushiro Coal Mine is located on the coast of the Pacific Ocean, where the mining of Paleogene bituminous coal occurs under the ocean bottom
The variation in water drainage can be roughly regarded as the variation in water inflow because only a small, relatively constant amount of collected water is used for machinery cooling and showers to prevent rock dust
It gradually decreased with time and, after the sudden decrease due to the abandonment of the drainage from Cretaceous, became almost constant
Summary
Kushiro Coal Mine is located on the coast of the Pacific Ocean, where the mining of Paleogene bituminous coal occurs under the ocean bottom (see Fujii et al.[3], for details of the geology, mining method, etc.). Data recorded by Taiheiyo Coal Mine are presented. The water flowing into Taiheiyo Coal Mine was not seawater, but was fossil water from holes drilled in Cretaceous rock for water drainage and groundwater from the land[4]. The water flowing into Kushiro Coal Mine is only groundwater from the land. Water inflow itself was not measured, but the amount of daily water drainage from 7 am to 7 am JST (Japan Standard Time, UTC (Coordinated Universal Time) +9 hours) on the day from the No 2 pump pit (N42.96°, E144.41°, Fig. 1) located 152 m below sea level was recorded. The variation in water drainage can be roughly regarded as the variation in water inflow because only a small, relatively constant amount of collected water is used for machinery cooling and showers to prevent rock dust
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