ocr: Mercalli scale and the equivalent Richter scale Very slight: detected by instruments only <3 Feeble: felt by people resting 3-3.4 Slight: like neavytrucks passing 3.5-4 VI Moderate: windows rattle 4.1-4.4 VI Rather strong: wakes sleeping people 4.5-4.8 M Strong: trees sway, walls crack 4.9-5.4 VII Very strong: people fall over, buildings crack 5.5-6 VIII Destructive: chimneys fall, buildings move 6.1-6.5 IX Ruinous: heavy damage to buidings, ground cracks 6.6-7 X Disastrous: most buildings destroyed, landslides 7.1-7.3 XI Very disastrous: rairoads and pipelines break 7.4-8.1 XII Catastrophic: ...
