2 February 1816, an Overlooked North Atlantic M 8 Earthquake
The 2 February 1816 North Atlantic earthquake is virtually unknown to the international scientific community, and the few existing studies—solely based on two or three macroseismic intensities—pointed to a magnitude near 7 and a location at the eastern end of the Gloria fault in the Azores‐Gibraltar...
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Online Access: | https://hdl.handle.net/10216/143344 https://doi.org/10.1785/0220200201 |
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ftunivporto:oai:repositorio-aberto.up.pt:10216/143344 2023-06-18T03:41:56+02:00 2 February 1816, an Overlooked North Atlantic M 8 Earthquake Ribeiro, J Correia, A Ribeiro, AI Instituto de Saúde Pública da Universidade do Porto 2020 application/pdf https://hdl.handle.net/10216/143344 https://doi.org/10.1785/0220200201 eng eng Seismological Society of America Seismol Res Lett 2020 91 (5): 2912–2921 https://pubs.geoscienceworld.org/ssa/srl/article-abstract/91/5/2912/588074/2-February-1816-an-Overlooked-North-Atlantic-M-8?redirectedFrom=fulltext 0895-0695 1938-2057 https://hdl.handle.net/10216/143344 doi:10.1785/0220200201 info:eu-repo/semantics/restrictedAccess info:eu-repo/semantics/article 2020 ftunivporto https://doi.org/10.1785/0220200201 2023-06-06T21:52:03Z The 2 February 1816 North Atlantic earthquake is virtually unknown to the international scientific community, and the few existing studies—solely based on two or three macroseismic intensities—pointed to a magnitude near 7 and a location at the eastern end of the Gloria fault in the Azores‐Gibraltar Fracture Zone (AGFZ). Through careful search, we discovered more than 40 independent macroseismic observations and were able to estimate a total of 26 values of intensity, covering a wide geographical area (Iberian Peninsula, Madeira, and Azores). To apply the Bakun and Wentworth (B&W) method to the macroseismic dataset, we also deduced intensity–distance attenuation equations for the three different Atlantic coasts. The B&W procedure enabled us to conclude that the 2 February 1816 earthquake had a moment magnitude of 8.6±0.3 at the 95% confidence level and an epicentral location of 37.8° N and 19.8° W, near the central part of the Gloria fault. These results place the event as the greatest known earthquake in the Gloria fault domain and as one of the greatest ever seismic events along the AGFZ, probably only surpassed by the 1755 Lisbon earthquake. Article in Journal/Newspaper North Atlantic Repositório Aberto da Universidade do Porto Seismological Research Letters 91 5 2912 2921 |
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Repositório Aberto da Universidade do Porto |
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ftunivporto |
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English |
description |
The 2 February 1816 North Atlantic earthquake is virtually unknown to the international scientific community, and the few existing studies—solely based on two or three macroseismic intensities—pointed to a magnitude near 7 and a location at the eastern end of the Gloria fault in the Azores‐Gibraltar Fracture Zone (AGFZ). Through careful search, we discovered more than 40 independent macroseismic observations and were able to estimate a total of 26 values of intensity, covering a wide geographical area (Iberian Peninsula, Madeira, and Azores). To apply the Bakun and Wentworth (B&W) method to the macroseismic dataset, we also deduced intensity–distance attenuation equations for the three different Atlantic coasts. The B&W procedure enabled us to conclude that the 2 February 1816 earthquake had a moment magnitude of 8.6±0.3 at the 95% confidence level and an epicentral location of 37.8° N and 19.8° W, near the central part of the Gloria fault. These results place the event as the greatest known earthquake in the Gloria fault domain and as one of the greatest ever seismic events along the AGFZ, probably only surpassed by the 1755 Lisbon earthquake. |
author2 |
Instituto de Saúde Pública da Universidade do Porto |
format |
Article in Journal/Newspaper |
author |
Ribeiro, J Correia, A Ribeiro, AI |
spellingShingle |
Ribeiro, J Correia, A Ribeiro, AI 2 February 1816, an Overlooked North Atlantic M 8 Earthquake |
author_facet |
Ribeiro, J Correia, A Ribeiro, AI |
author_sort |
Ribeiro, J |
title |
2 February 1816, an Overlooked North Atlantic M 8 Earthquake |
title_short |
2 February 1816, an Overlooked North Atlantic M 8 Earthquake |
title_full |
2 February 1816, an Overlooked North Atlantic M 8 Earthquake |
title_fullStr |
2 February 1816, an Overlooked North Atlantic M 8 Earthquake |
title_full_unstemmed |
2 February 1816, an Overlooked North Atlantic M 8 Earthquake |
title_sort |
2 february 1816, an overlooked north atlantic m 8 earthquake |
publisher |
Seismological Society of America |
publishDate |
2020 |
url |
https://hdl.handle.net/10216/143344 https://doi.org/10.1785/0220200201 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
Seismol Res Lett 2020 91 (5): 2912–2921 https://pubs.geoscienceworld.org/ssa/srl/article-abstract/91/5/2912/588074/2-February-1816-an-Overlooked-North-Atlantic-M-8?redirectedFrom=fulltext 0895-0695 1938-2057 https://hdl.handle.net/10216/143344 doi:10.1785/0220200201 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1785/0220200201 |
container_title |
Seismological Research Letters |
container_volume |
91 |
container_issue |
5 |
container_start_page |
2912 |
op_container_end_page |
2921 |
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1769007663912321024 |