The source of the 1722 Algarve earthquake: evidence from MCS and Tsunami data |
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| Authors: | M A Baptista J M Miranda Fernando C Lopes Joaquim F Luis |
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| Institution: | (1) Instituto Superior de Engenharia de Lisboa, CGUL, IDL, Campo Grande, C8, Lisbon, 1749-016 Lisboa, Portugal;(2) University of Lisbon, CGUL, IDL, Lisbon, Portugal;(3) Departamento de Ciências da Terra, CGUC, University of Coimbra, Coimbra, Portugal;(4) University of Algarve, CIMA, Faro, Portugal |
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| Abstract: | The 27 December 1722 Algarve earthquake destroyed a large area in southern Portugal generating a local tsunami that inundated
the shallow areas of Tavira. It is unclear whether its source was located onshore or offshore and, in any case, what was the
tectonic source responsible for the event. We analyze available historical information concerning macroseismicity and the
tsunami to discuss the most probable location of the source. We also review available seismotectonic knowledge of the offshore
region close to the probable epicenter, selecting a set of four candidate sources. We simulate tsunamis produced by these
candidate sources assuming that the sea bottom displacement is caused by a compressive dislocation over a rectangular fault,
as given by the half-space homogeneous elastic approach, and we use numerical modeling to study wave propagation and run-up.
We conclude that the 27 December 1722 Tavira earthquake and tsunami was probably generated offshore, close to 37°01′N, 7°49′W. |
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| Keywords: | Tsunamis Historical seismicity Modelling |
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