Table 1 Parameters and numbers of red sandstone.

From: Crack evolution and fractal characteristics of fractured red sandstone based on acoustic emission parameters

Sample numbering

Quality /g

volume /cm3

Angle of fracture /°

Sample numbering

Quality /g

volume /cm3

Angle of fracture /°

1–1

598.91

252.040

/

4 − 1

592.58

252.558

45

1–2

598.67

252.507

/

4 − 2

592.95

252.457

45

1–3

598.66

252.055

/

4 − 3

592.04

252.502

45

2 − 1

592.34

252.406

0

5 − 1

593.40

251.678

60

2–2

592.81

252.522

0

5 − 2

593.00

252.407

60

2–3

592.52

251.861

0

5 − 3

593.06

253.001

60

3 − 1

592.97

251.926

30

6 − 1

592.15

251.859

90

3 − 2

592.98

251.904

30

6 − 2

592.65

251.955

90

3–3

592.62

252.256

30

6 − 3

592.69

252.307

90