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Table 4 Observation periods, test specifications, and estimated permeabilities from slug, recovery, and pumping tests at both boreholes

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

Hole 1

   

Slug test

Observation period in JST

Data period for estimating permeability in JST

Initial water level from GL (m, estimated)

Hydraulic conductivity (10−9 m s−1)

Permeability (10−16 m2)

Beginning

Ending

Beginning

Ending

Duration (h)

1

April 6, 2008, 18:00

April 9, 2008, 8:00

April 7, 2008, 8:00

April 8, 2008, 19:00

35

25

2.4

2.5

2

April 9, 2008, 8:30

April 10, 2008, 7:30

April 9, 2008, 8:30

April 10, 2008, 7:30

23

21.53

0.76

0.78

3

April 10, 2008, 8:30

April 11, 2008, 7:30

April 10, 2008, 8:30

April 11, 2008, 7:30

23

21.53

0.81

0.83

4

April 11, 2008, 8:30

April 12, 2008, 7:30

April 11, 2008, 8:30

April 12, 2008, 7:30

23

21.53

0.71

0.73

5

April 12, 2008, 8:30

April 13, 2008, 7:30

April 12, 2008, 8:30

April 13, 2008, 7:30

23

21.53

0.60

0.61

6

April 13, 2008, 15:00

May 12, 2008, 8:00

April 13, 2008, 15:00

April 15, 2008, 14:00

47

21.53

0.52

0.53

Recovery test

Initial water pressure above the wellhead (m)

Hydraulic conductivity (10−8 m s−1)

Permeability (10−15 m2)

1

August 28, 2011, 15:00

August 30, 2011, 15:00

August 28, 2011, 21:00

August 29, 2011, 20:00

23

14.5

1.1

1.2

2

February 23, 2012, 22:00

February 25, 2012, 22:00

February 24, 2012, 4:00

February 24, 2012, 22:00

18

15.8

1.7

1.7

3–1

February 19, 2015, 12:00

February 21, 2015, 11:00

February 19, 2015, 16:00

February 20, 2015, 3:00

11

22.1

4.8

5.0

3–2

February 19, 2015, 12:00

 February 21, 2015, 11:00

February 20, 2015, 11:00

February 21, 2015, 11:00

24

 22.1

1.1

1.1

Hole 2

  

Pumping test

Observation period in JST

Initial water level from GL (m)

Transmissivity (m2 s−1)

Length of gravel filter pack outside casing (m)

Hydraulic conductivity (10−8 m s−1)

Permeability (10−15 m2)

Beginning

Ending

1

January 8, 2008, 15:00

January 10, 2008, 14:15

95

2.5 × 10−7

17.2

1.5

1.5

Recovery test

Observation period in JST

Data period for estimating permeability in JST

Initial water pressure above the well head (m)

 Hydraulic conductivity (10−8 m s−1)

 Permeability (10−15 m2)

Beginning

Ending

Beginning

Ending

Duration (h)

1–1

October 1, 2008, 10:00

October 4, 2008, 9:00

October 1, 2008, 10:00

October 1, 2008, 21:00

11

69

1.0

1.1

1–2

October 1, 2008, 10:00

October 4, 2008, 9:00

October 3, 2008, 10:00

October 5, 2008, 22:00

60

69

0.43

0.44

  1. All times are Japan Standard Time