Magnitude 3.5 earthquake recorded southeast of Antigua and Barbuda

The University of the West Indies Seismic Research Centre (UWI-SRC), the authoritative regional body monitoring seismic activity across the Caribbean basin, confirmed that a low-magnitude tremor struck offshore the northeastern Caribbean archipelago on the evening of November 6. The minor seismic event registered at magnitude 3.5, with initial automated data placing its epicentre 130 kilometres southeast of St. John’s, the capital city of Antigua and Barbuda, at a shallow depth of just 10 kilometres below the seabed. The exact timing of the quake was logged at 8:36 p.m. local time. Geospatial cross-verification of the preliminary coordinates — 16.72 degrees north latitude and 60.74 degrees west longitude — further situates the tremor site 103 kilometres northeast of Pointe-à-Pitre, the largest city in the French overseas territory of Guadeloupe, and 163 kilometres east of Brades, the de facto administrative capital of the British Overseas Territory of Montserrat. UWI-SRC officials noted in their public advisory that the current location and magnitude readings were generated in real time by the centre’s automated seismic monitoring algorithms, and the data set will be subject to a full manual review by a team of certified seismology analysts in the coming 24 to 48 hours, which may lead to minor adjustments to the published parameters. No immediate reports of structural damage, ground shaking injuries or secondary hazards such as small tsunamis have been filed from nearby coastal communities as of the advisory release, given the event’s low intensity and far-offshore positioning.