Table 4 Statistical analysis summary with STL and causality test for creep data of axial strain responses with varying time at various confining pressure level conditions.

From: Salt rock creep deformation forecasting using deep neural networks and analytical models for subsurface energy storage applications

Creep datasets (MPa)

Seasonal/non-seasonal

Causality analysis

p-value (reference value < 0.05)

Stationary/non-stationary

5

Hardly observed any seasonality in the data

There is hardly any causality between strain and temperature data

0.016574

Stationary

15

Same

Same

0.037656

Stationary

25 (in-situ)

Same

Same

0.021693

Stationary

35

Same

Same

0.017894

Stationary

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