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Table 4 Amplitudes of the tidal components with associated frequencies observed on BDB-1 pore pressure time series between 01/09/2014 and 10/03/2015

From: Comparative study of methods to estimate hydraulic parameters in the hydraulically undisturbed Opalinus Clay (Switzerland)

Formation/associated chamber

Amplitude on the RMS spectrum [bars]

Form ratio

O1

(1.076 × 10−5 Hz)

K1

(1.161 × 10−5 Hz)

S2

(2.315 × 10−5 Hz)

M2

(2.236 × 10−5 Hz)

Staffelegg formation/I1

5.886 × 10−4

6.326 × 10−4

3.606 × 10−4

8.353 × 10−4

1.02

OPA-shaly facies/I2

1.054 × 10−3

1.230 × 10−3

6.848 × 10−4

1.696 × 10−3

0.96

OPA-shaly facies/I2–3

1.041 × 10−3

1.192 × 10−3

7.390 × 10−4

1.823 × 10−3

0.87

OPA-carbonate-rich facies/I3

7.905 × 10−4

9.553 × 10−4

5.014 × 10−4

1.255 × 10−3

0.99

OPA-shaly facies/I4

9.560 × 10−4

1.133 × 10−3

6.838 × 10−4

1.701 × 10−3

0.88

OPA-shaly facies/I5

8.591 × 10−4

1.084 × 10−4

6.546 × 10−4

1.670 × 10−3

0.84

OPA-sandy facies/I6

8.637 × 10−4

1.205 × 10−3

5.329 × 10−4

1.278 × 10−3

1.04

Passwang formation/I7

5.200 × 10−4

7.206 × 10−4

2.825 × 10−4

6.360 × 10−4

1.35