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Geoenvironmental Disasters

Table 6 Rock Mass Rating basic (RMRb) (Bieniawski 1989)

From: Slope mass rating-based analysis to assess rockfall hazard on Yogyakarta Southern Mountain, Indonesia

RMRb value

81–100

61–80

41–60

21–40

<  20

Rock quality

Very good

Good

Moderate

Bad

Very bad

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