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The 23 April 1909 Benavente earthquake (Portugal): macroseismic field revision

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Abstract

The 23 April 1909 earthquake, with epicentre near Benavente (Portugal), was the largest crustal earthquake in the Iberian Peninsula during the twentieth century (M w = 6.0). Due to its importance, several studies were developed soon after its occurrence, in Portugal and in Spain. A perusal of the different studies on the macroseismic field of this earthquake showed some discrepancies, in particular on the abnormal patterns of the isoseismal curves in Spain. Besides, a complete list of intensity data points for the event is unavailable at present. Seismic moment, focal mechanism and other earthquake parameters obtained from the instrumental records have been recently reviewed and recalculated. Revision of the macroseismic field of this earthquake poses a unique opportunity to study macroseismic propagation and local effects in central Iberian Peninsula. For this reasons, a search to collect new macroseismic data for this earthquake has been carried out, and a re-evaluation of the whole set has been performed and it is presented here. Special attention is paid to the observed low attenuation of the macroseismic effects, heterogeneous propagation and the distortion introduced by local amplifications. Results of this study indicate, in general, an overestimation of the intensity degrees previously assigned to this earthquake in Spain; also it illustrates how difficult it is to assign an intensity degree to a large town, where local effects play an important role, and confirms the low attenuation of seismic propagation inside the Iberian Peninsula from west and southwest to east and northeast.

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Authors and Affiliations

  1. IDL—Instituto Dom Luiz, University of Lisbon, Campo Grande, Edifício C8, 1749-016, Lisbon, Portugal

    Paula Teves-Costa & Josep Batlló

  2. FCUL-DEGGE, Faculty of Sciences, University of Lisbon, Campo Grande, Edifício C8, 1749-016, Lisbon, Portugal

    Paula Teves-Costa

Authors
  1. Paula Teves-Costa
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  2. Josep Batlló
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Correspondence to Paula Teves-Costa.

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Teves-Costa, P., Batlló, J. The 23 April 1909 Benavente earthquake (Portugal): macroseismic field revision. J Seismol 15, 59–70 (2011). https://doi.org/10.1007/s10950-010-9207-6

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