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Title: Maximum Observed Intensity Map for the Azores Archipelago (Portugal) from 1522- 2012 seismic catalogue
Authors: Fontiela, João
Bezzeghoud, Mourad
Rosset, Philippe
Rodrigues, Francisco Cota
Editors: Zhigang, Peng
Keywords: Earthquakes
Atlantic Ocean Islands
Plate tectonics
Issue Date: Jul-2017
Publisher: Seismological Society of America
Citation: Fontiela J., M. Bezzeghoud, Rosset P., Rodrigues F.C., 2017. Maximum Observed Intensity Map for the Azores Archipelago (Portugal) from 1522- 2012 seismic catalogue, 2017. Seismological Research Letter, 88, 4
Abstract: The Azores archipelago is a seismically active region composed of nine islands and located at the triple junction of the American, Nubian, and Eurasian plates. Since its settlement in the fifteenth century, 33 earthquakes with intensity higher than VII have been reported. This article shows areas that experienced strong ground shaking using maximum observed intensity (MOI) mapping. For this purpose, 323 records from 167 earthquakes in the period 1522–2012 have been compiled, and MOI values are interpolated on a regular grid of points using the kriging method. The comparison of observed and calculated MOI for four damaging and deadly earthquakes indicates a good calibration of the procedure relative to the available dataset. For the islands of the central group, which comprises Terceira, Graciosa, São Jorge, Pico, and Faial, the highest calculated intensities (XI) are located in the eastern part of São Jorge Island. Intensities (X) are observed on Faial along a northwest–southeast stripe. For Graciosa, Terceira, and Pico, the estimated maximum intensities are IX, VIII, and VII, respectively. For the eastern group of islands, the highest intensities (X) are located in the southeastern part of São Miguel Island, and on Santa Maria Island the maximum intensity of VI is observed in its eastern part. Finally, Flores and Corvo Islands, located on the American plate, have a very low seismicity.
ISBN: 0895-0695
ISSN: 1938-2057
Type: article
Appears in Collections:FIS - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica
CGE - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica

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