Two earthquakes of magnitude 2.5 and 2.6 on the Richter scale were felt Tuesday on the island of Terceira, the Azores Center for Volcano Seismic Information and Observation (CIVISA) said.
According to CIVISA, the earthquakes were recorded at 12:55 local time (13:55 Lisbon).
The epicenter of the first event, at magnitude 2.6 on the Richter scale, was about three kilometers north-northeast of Santa Barbara, and the epicenter of the second, at magnitude 2.5, was about 0.5 kilometers east of the Twelve Rivers.
“According to the information currently available, earthquakes were felt with maximum intensity IV (modified Mercalli scale) in Dose Ribeiras, Santa Barbara, Cinco Ribeiras, San Bartolomeu, San Mateus, Terra Chan, San Pedro, Santa Luzia and Conceican (municipality of Angra do Heroismo, Terceira Island),” CIVISA said in a statement.
In a note, CIVISA recalls that the earthquakes are part of the “ongoing seismic volcanic crisis on Terceira since June 2022.”
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 (40-4.9), 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 more 10).
The modified Mercalli scale measures “degree of intensity and corresponding description”.
At intensity IV, which is considered moderate, “parked cars shake,” “windows, doors, and crockery shake,” “glasses and crockery rattle or tinkle,” and walls or wooden structures may creak, the Sea and Atmospheric Institute describes. (IPMA) on its website.
Author: Portuguese
Source: CM Jornal
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