New study on the 1941 Gloria Fault earthquake and tsunami
The M ∼ 8.3–8.4 25 November 1941 was one of the largest submarine strike-slip earthquakes ever recorded in the Northeast (NE) Atlantic basin. This event occurred along the Eurasia–Nubia plate boundary between the Azores and the Strait of Gibraltar. After the earthquake, the tide stations in the NE A...
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ftdoajarticles:oai:doaj.org/article:404d4e0d22d04eaa9f59b8adfcb19946 2023-05-15T17:41:31+02:00 New study on the 1941 Gloria Fault earthquake and tsunami M. A. Baptista J. M. Miranda J. Batlló F. Lisboa J. Luis R. Maciá 2016-08-01T00:00:00Z https://doi.org/10.5194/nhess-16-1967-2016 https://doaj.org/article/404d4e0d22d04eaa9f59b8adfcb19946 EN eng Copernicus Publications http://www.nat-hazards-earth-syst-sci.net/16/1967/2016/nhess-16-1967-2016.pdf https://doaj.org/toc/1561-8633 https://doaj.org/toc/1684-9981 1561-8633 1684-9981 doi:10.5194/nhess-16-1967-2016 https://doaj.org/article/404d4e0d22d04eaa9f59b8adfcb19946 Natural Hazards and Earth System Sciences, Vol 16, Iss 8, Pp 1967-1977 (2016) Environmental technology. Sanitary engineering TD1-1066 Geography. Anthropology. Recreation G Environmental sciences GE1-350 Geology QE1-996.5 article 2016 ftdoajarticles https://doi.org/10.5194/nhess-16-1967-2016 2022-12-31T12:31:37Z The M ∼ 8.3–8.4 25 November 1941 was one of the largest submarine strike-slip earthquakes ever recorded in the Northeast (NE) Atlantic basin. This event occurred along the Eurasia–Nubia plate boundary between the Azores and the Strait of Gibraltar. After the earthquake, the tide stations in the NE Atlantic recorded a small tsunami with maximum amplitudes of 40 cm peak to through in the Azores and Madeira islands. In this study, we present a re-evaluation of the earthquake epicentre location using seismological data not included in previous studies. We invert the tsunami travel times to obtain a preliminary tsunami source location using the backward ray tracing (BRT) technique. We invert the tsunami waveforms to infer the initial sea surface displacement using empirical Green's functions, without prior assumptions about the geometry of the source. The results of the BRT simulation locate the tsunami source quite close to the new epicentre. This fact suggests that the co-seismic deformation of the earthquake induced the tsunami. The waveform inversion of tsunami data favours the conclusion that the earthquake ruptured an approximately 160 km segment of the plate boundary, in the eastern section of the Gloria Fault between −20.249 and −18.630° E. The results presented here contribute to the evaluation of tsunami hazard in the Northeast Atlantic basin. Article in Journal/Newspaper Northeast Atlantic Directory of Open Access Journals: DOAJ Articles Natural Hazards and Earth System Sciences 16 8 1967 1977 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental technology. Sanitary engineering TD1-1066 Geography. Anthropology. Recreation G Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental technology. Sanitary engineering TD1-1066 Geography. Anthropology. Recreation G Environmental sciences GE1-350 Geology QE1-996.5 M. A. Baptista J. M. Miranda J. Batlló F. Lisboa J. Luis R. Maciá New study on the 1941 Gloria Fault earthquake and tsunami |
topic_facet |
Environmental technology. Sanitary engineering TD1-1066 Geography. Anthropology. Recreation G Environmental sciences GE1-350 Geology QE1-996.5 |
description |
The M ∼ 8.3–8.4 25 November 1941 was one of the largest submarine strike-slip earthquakes ever recorded in the Northeast (NE) Atlantic basin. This event occurred along the Eurasia–Nubia plate boundary between the Azores and the Strait of Gibraltar. After the earthquake, the tide stations in the NE Atlantic recorded a small tsunami with maximum amplitudes of 40 cm peak to through in the Azores and Madeira islands. In this study, we present a re-evaluation of the earthquake epicentre location using seismological data not included in previous studies. We invert the tsunami travel times to obtain a preliminary tsunami source location using the backward ray tracing (BRT) technique. We invert the tsunami waveforms to infer the initial sea surface displacement using empirical Green's functions, without prior assumptions about the geometry of the source. The results of the BRT simulation locate the tsunami source quite close to the new epicentre. This fact suggests that the co-seismic deformation of the earthquake induced the tsunami. The waveform inversion of tsunami data favours the conclusion that the earthquake ruptured an approximately 160 km segment of the plate boundary, in the eastern section of the Gloria Fault between −20.249 and −18.630° E. The results presented here contribute to the evaluation of tsunami hazard in the Northeast Atlantic basin. |
format |
Article in Journal/Newspaper |
author |
M. A. Baptista J. M. Miranda J. Batlló F. Lisboa J. Luis R. Maciá |
author_facet |
M. A. Baptista J. M. Miranda J. Batlló F. Lisboa J. Luis R. Maciá |
author_sort |
M. A. Baptista |
title |
New study on the 1941 Gloria Fault earthquake and tsunami |
title_short |
New study on the 1941 Gloria Fault earthquake and tsunami |
title_full |
New study on the 1941 Gloria Fault earthquake and tsunami |
title_fullStr |
New study on the 1941 Gloria Fault earthquake and tsunami |
title_full_unstemmed |
New study on the 1941 Gloria Fault earthquake and tsunami |
title_sort |
new study on the 1941 gloria fault earthquake and tsunami |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/nhess-16-1967-2016 https://doaj.org/article/404d4e0d22d04eaa9f59b8adfcb19946 |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_source |
Natural Hazards and Earth System Sciences, Vol 16, Iss 8, Pp 1967-1977 (2016) |
op_relation |
http://www.nat-hazards-earth-syst-sci.net/16/1967/2016/nhess-16-1967-2016.pdf https://doaj.org/toc/1561-8633 https://doaj.org/toc/1684-9981 1561-8633 1684-9981 doi:10.5194/nhess-16-1967-2016 https://doaj.org/article/404d4e0d22d04eaa9f59b8adfcb19946 |
op_doi |
https://doi.org/10.5194/nhess-16-1967-2016 |
container_title |
Natural Hazards and Earth System Sciences |
container_volume |
16 |
container_issue |
8 |
container_start_page |
1967 |
op_container_end_page |
1977 |
_version_ |
1766143113928114176 |