An earthquake measuring 2.7 on the Richter scale was felt on the island of Terceira in the Azores on Tuesday after two tremors were recorded on the same day, one measuring 2.8 and the other measuring 2.5.
According to the Portuguese Institute of the Sea and Atmosphere (IPMA), an earthquake measuring 2.7 on the Richter scale was recorded at 22:57 (23:57 in Lisbon) at stations of the seismic network of the Azores archipelago, and its epicenter was in an area four kilometers to south of Raminho (Terceira).
This earthquake did not cause any personal or property damage and was felt at maximum intensity II/III (modified Mercalli scale) in the parishes of São Bartolomeu de Regatos and Terra Chan in the municipality of Angra do Heroismo.
Earlier, at 22:16 local time (23:16 in Lisbon), an earthquake measuring 2.8 on the Richter scale was recorded, the epicenter of which was approximately three kilometers from Serreta, on the island of Terceira.
According to the Azores Center for Seismovolcanic Information and Observation (CIVISA), this earthquake with maximum intensity IV (Modified Mercalli scale) was felt in the parishes of Serreta, Raminho, Altares Doze Ribeiras and Santa Barbara (municipal of Angra do Heroísmo, Terceira Island) . .
The shock was also felt with intensity III/IV in the parish of Biscoitos (municipality of Praia da Vitória, Terceira island) and III in the parish of Terra Chan (municipality of Angra do Heroísmo, Terceira island).”
According to CIVISA, the event “is part of the ongoing seismovolcanic crisis on the island of Terceira since June 2022.”
Also on Tuesday, an earthquake measuring 2.5 on the Richter scale was felt on the island of Terceira.
According to CIVISA, the earthquake was felt at 16:39 local time (17:39 in Lisbon) and had an epicenter approximately three kilometers north-northeast of Santa Barbara, felt at maximum intensity III/IV (Modified Mercalli Scale) . ) in the parishes of Santa Barbara and Doze Ribeiras (municipality of Angra do Heroísmo, Terceira island).
On the Richter scale, earthquakes are classified by magnitude into micro (less than 2.0), very small (2.0-2.9), small (3.0-3.9), weak (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 extreme (when higher 10).
The Modified Mercalli Scale measures “degree of intensity and corresponding description.”
At intensity III, considered weak, the shock is felt inside the house and hanging objects sway, feeling “a vibration similar to that caused by the passage of heavy vehicles,” the Portuguese Institute of the Sea and the Atmosphere (IPMA) said on its webpage. .
At intensity IV, considered moderate, parked cars shake, windows, doors, and utensils shake, “glasses and utensils rattle or clank,” and walls or woodwork may creak.