According to IPMA, the first earthquake measuring 3.9 on the Richter scale was registered at 6.52 a.m. with the epicentre about 55km west-southwest of Sines, in the Setúbal district.

The second one, measuring 3.3 in the Richter scale, was registered at 6.58 a.m. and also had its epicentre about 55km west-southwest of Sines.

In a statement, IPMA said, “no information has been received confirming that his earthquake was felt.”

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), significant (8.0-8.9), exceptional (9, 0-9,9) and extreme (more than 10).