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Table 5 Observation period, data period, and initial water pressure for the trials of permeability estimation using natural recovery of background water pressures in both Holes 1 and 2

From: In-situ permeability of fault zones estimated by hydraulic tests and continuous groundwater-pressure observations

Hole

Observation period in JST

Data period for estimating permeability in JST

Initial water pressure above the well head (m)

Hydraulic conductivity (10−11 m s−1)

Permeability (10−18 m2)

Beginning

Ending

Beginning

Ending

Duration (h)

1

January 13, 2010, 6:00

January 24, 2017, 6:00

May 19, 2010, 6:00

April 20, 2014, 6:00

34,368

24.3883

0.42

0.43

GL + 0.578 m

GL + 24.388 m

2

May 19, 2008, 6:00

November 26, 2008, 6:00

June 3, 2008, 6:00

August 4, 2008, 6:00

1488

71.9245

7.5

7.7

GL + 12.826 m

GL + 71.925 m

  1. All times are Japan Standard Time