Summary:
Magnitude 3.1 earthquake recorded south of Sesimbra
Epicenter located 30 kilometers south of Sesimbra
No reports of the earthquake being felt by residents
Previous magnitude 5.3 earthquake occurred on August 26
Classifications of earthquakes according to the Richter scale
Earthquake Details
A magnitude 3.1 earthquake was recorded this Thursday in Portugal, with its epicenter located approximately 30 kilometers south of Sesimbra, in the Setúbal district. The earthquake occurred at 3:26 AM, as reported by the Portuguese Institute of Sea and Atmosphere (IPMA).
Impact and Previous Events
As of the time of this announcement, there have been no reports confirming that this earthquake was felt by residents. Notably, on August 26, a stronger magnitude 5.3 earthquake was recorded at 5:11 AM, approximately 60 kilometers west of Sines, which was felt in various regions of Portugal, particularly in Setúbal and Lisbon. This earlier quake was noted as the 10th largest earthquake in Portugal since the 16th century, according to IPMA.
Understanding Earthquake Magnitudes
According to the Richter scale, earthquakes are classified as follows:
- Micro: less than 2.0
- Very Small: 2.0 - 2.9
- Small: 3.0 - 3.9
- Light: 4.0 - 4.9
- Moderate: 5.0 - 5.9
- Strong: 6.0 - 6.9
- Major: 7.0 - 7.9
- Great: 8.0 - 8.9
- Exceptional: 9.0 - 9.9
- Extreme: above 10
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