New study on the 1941 Gloria Fault earthquake and tsunami
The M similar to 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...
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ftunivalgarve:oai:sapientia.ualg.pt:10400.1/9337 2023-05-15T17:41:28+02:00 New study on the 1941 Gloria Fault earthquake and tsunami Baptista, Maria Ana Miranda, Jorge Miguel Batllo, Josep Lisboa, Filipe Luis, Joaquim Macia, Ramon 2016-08 http://hdl.handle.net/10400.1/9337 https://doi.org/10.5194/nhess-16-1967-2016 eng eng info:eu-repo/grantAgreement/EC/FP7/603839/EU WOS:000383795800001 1561-8633 AUT: JLU00339; http://hdl.handle.net/10400.1/9337 doi:10.5194/nhess-16-1967-2016 openAccess article 2016 ftunivalgarve https://doi.org/10.5194/nhess-16-1967-2016 2022-05-30T08:47:34Z The M similar to 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 degrees E. The results presented here contribute to the evaluation of tsunami hazard in the Northeast Atlantic basin. Article in Journal/Newspaper Northeast Atlantic Universidade do Algarve: Sapienta Natural Hazards and Earth System Sciences 16 8 1967 1977 |
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Universidade do Algarve: Sapienta |
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language |
English |
description |
The M similar to 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 degrees E. The results presented here contribute to the evaluation of tsunami hazard in the Northeast Atlantic basin. |
format |
Article in Journal/Newspaper |
author |
Baptista, Maria Ana Miranda, Jorge Miguel Batllo, Josep Lisboa, Filipe Luis, Joaquim Macia, Ramon |
spellingShingle |
Baptista, Maria Ana Miranda, Jorge Miguel Batllo, Josep Lisboa, Filipe Luis, Joaquim Macia, Ramon New study on the 1941 Gloria Fault earthquake and tsunami |
author_facet |
Baptista, Maria Ana Miranda, Jorge Miguel Batllo, Josep Lisboa, Filipe Luis, Joaquim Macia, Ramon |
author_sort |
Baptista, Maria Ana |
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 |
publishDate |
2016 |
url |
http://hdl.handle.net/10400.1/9337 https://doi.org/10.5194/nhess-16-1967-2016 |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_relation |
info:eu-repo/grantAgreement/EC/FP7/603839/EU WOS:000383795800001 1561-8633 AUT: JLU00339; http://hdl.handle.net/10400.1/9337 doi:10.5194/nhess-16-1967-2016 |
op_rights |
openAccess |
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_ |
1766143053881409536 |