The earthquake, whose epicentre was close to Montemor-o-Novo, was felt with maximum intensity III, on the Modified Mercalli scale, indicates the IPMA.

Earthquakes are classified according to their magnitude as micro (less than 2.0), very small (2.0-2.9), small (3.0-3.9), slight (4.0-4. 9 ), moderate (5.0-5.9), strong (6.0-6.9), large (7.0-7.9), important (8.0-8.9), exceptional (9, 0-9.9) and wing (above 10).

Grade III on the Mercalli scale corresponds to effects considered weak. “It’s felt at home. Hanging objects swing. The vibration is similar to that caused by the passage of heavy vehicles”, describes IPMA.