Water drainage from Kushiro Coal Mine decreased on the day of all M ≥ 7.5 earthquakes and increased thereafter

Fujii, Yoshiyuki; Ichihara, Yoshihisa; Matsumoto, Hiroyuki; Kodama, Junichi; Fukuda, Daisuke; Dassanayake, Anjula Buddhika Nayomi

doi:10.1038/s41598-018-34931-5

Cited by 2 publications

(1 citation statement)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…is is observed because of the persistent variation in the permeability of rock mass, which is due to the variation in strain; this variation is in turn caused by fault movement. Such variations may also occur in an intermediate field (from one to multiple fault lengths) [3]. However, it was shown that those persistent modifications in the groundwater level may even occur in the far field (many fault lengths), up to thousands of kilometers from the epicenter [4,5].…”

Section: Introductionmentioning

confidence: 99%

Variation in the Permeability of Intact and Fractured Rocks due to Transient Disturbances in Axial Stress or Pore Pressure

Boeut

Oshima

Fujii

et al. 2019

Advances in Civil Engineering

Self Cite

View full text Add to dashboard Cite

A persistent increase in the permeability of rock mass caused by transient stress disturbances, if present, could explain the variation in the groundwater level in far fields, increase in petroleum production caused by earthquakes or artificial vibrations in enhanced oil recovery, and induction of earthquakes by seismic waves in intermediate and far fields. However, it has not been verified whether the transient stress disturbances induce an increase or decrease in the rock permeability. In this study, the permeability values of intact and triaxially fractured Kushiro Cretaceous sandstone and Shikotsu welded tuff were measured before and after transient axial stress or pore pressure disturbances to clarify the effects of transient stress disturbances on rock permeability. According to the experimental results, the stress disturbances showed either decreasing or increasing effects on the permeability depending on the rock type and experimental conditions. However, when focusing on the fractured rocks rather than the intact ones, which would be more important in field applications, the argillaceous Kushiro Cretaceous sandstone mainly exhibited decreasing effects and the glassy Shikotsu welded tuff mainly exhibited increasing effects.

show abstract

Section: Introductionmentioning

confidence: 99%