From: Slope mass rating-based analysis to assess rockfall hazard on Yogyakarta Southern Mountain, Indonesia
Description
Compressive Strength (MPa)
RMRb value
Extremely strong
> 250
15
Very strong
100–250
12
Strong
50–100
7
Moderate
25–50
4
Weak
10–25
2
Very weak
2–10
1
Extremely weak
1–2
0