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Testing the Earthquake Early-Warning Parameter Correlations in the Southern Iberian Peninsula

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Abstract

The south of the Iberian Peninsula is of especial interest for the application of Earthquake Early Warning System (EEWS) technologies due to the past occurrence of damaging earthquakes such as the 1755 Lisbon earthquake. However, there are several critical issues that need to be addressed in order to develop an EEWS in this area. The first is the magnitude scale inhomogeneity of the available catalogues. A second is that most of the available broad-band seismograms for this area correspond to earthquakes with magnitudes less than 6.0, recorded at distances greater than 100 km, and sometimes with a low signal-to-noise ratio. And third, the occurrence of large earthquakes in this area means that the standard EEWS time window normally used needs to be tested in order to check whether it is long enough. Our paper describes the results of homogenizing the catalogue magnitudes by using empirical relationships to obtain the moment magnitude Mw. A criterion based on a threshold value for the signal-to-noise ratio is applied in order to avoid noise-contaminated seismogram data. An important part of the study is a check of whether the correlations previously obtained for south Iberia are valid for other neighbouring areas such as Algeria, and for larger earthquakes. Finally, since recent studies have shown that the larger the earthquake the longer the time window needed to properly estimate the magnitude, the window was increased progressively from 0 to 20 s in order to study the behaviour of the EEWS parameters for the largest earthquakes in the database.

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Acknowledgments

The authors would like to thank to Robert Chatwin for revising and correcting the English text on the manuscript. This work was financially supported by Spain’s Ministerio de Educación y Ciencia CGL2010-19803-C03-01 project, by the ALERTES-RIM CGL2013-45724-C3-1-R project, by the INNOCAMPUS project (supported by the Spain’s Ministerio de Economía y Competitividad, Orden CIN/1934/2010) and by the NERA project which financed a three-month stay at the RISSC Laboratory (University of Naples, Italy). The contribution of AZ has been partly funded by REAKT Project (Strategies and tools for Real-Time EArthquake RisK ReducTion) founded by the European Community via the Seventh Framework Program for Research (FP7), Contract No. 282862.

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Correspondence to M. Carranza.

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Carranza, M., Buforn, E. & Zollo, A. Testing the Earthquake Early-Warning Parameter Correlations in the Southern Iberian Peninsula. Pure Appl. Geophys. 172, 2435–2448 (2015). https://doi.org/10.1007/s00024-015-1061-6

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