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Table 1 P-wave velocities (average ± standard deviation) in the three principal stress directions and the porosities for each sample

From: Cooling-induced permeability enhancement for networks of microfractures in superhot geothermal environments

Sample

Measurement direction

P-wave velocity (m/s)

Porosity (%)

Sample 1

σ1 direction

2220 ± 141

1.5%

σ2 direction

1854 ± 33

σ3 direction

2275 ± 38

Sample 2

σ1 direction

1920 ± 53

1.5%

σ2 direction

1973 ± 34

σ3 direction

2248 ± 53

Sample 3

σ1 direction

2001 ± 67

1.3%

σ2 direction

2081 ± 32

σ3 direction

2360 ± 48