Table 1 Medvedev seismic intensity scale.

From: Application of CO₂ fracturing blasting in mountain tunnel construction adjacent to existing structures

Intensity Grade

V(cm/s)

Vibration Characteristics

Ⅰ

<0.2

Detectable only by instruments. No structural damage.

Ⅱ

0.2ཞ0.4

Felt by few individuals at rest. No structural damage.

Ⅲ

0.4ཞ0.8

Perceptible to some individuals (or those anticipating vibration). No structural damage.

Ⅳ

0.8ཞ1.5

Felt by many occupants. Audible rattling of doors/windows. No structural damage.

Ⅴ

1.5ཞ3.0

Distinctly perceptible to all. Plaster shedding, furniture displacement, damage to aged earthen structures.

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