Abstract
In the present paper, three of the main seismic parameters, maximum magnitude -Mmax, b-value, and annual rate -AR, have been studied for the Pyrenees range in southwest Europe by a Geographic Information System (GIS). The main aim of this work is to calculate, represent continuously, and analyze some of the most crucial seismic indicators for this belt. To this end, an updated and homogenized Poissonian earthquake catalog has been generated, where the National Geographic Institute of Spain earthquake catalog has been considered as a starting point. Herein, the details about the catalog compilation, the magnitude homogenization, the declustering of the catalog, and the analysis of the completeness, are exposed. When the catalog has been produced, a GIS tool has been used to drive the parameters’ calculations and representations properly. Different grids (0.5 × 0.5° and 1 × 1°) have been created to depict a continuous map of these parameters. The b-value and AR have been obtained that take into account different pairs of magnitude–year of completeness. Mmax has been discretely obtained (by cells). The analysis of the results shows that the Central Pyrenees (mainly from Arudy to Bagnères de Bigorre) present the most pronounced seismicity in the range.
Highlights
In seismicity studies, some parameters have a important role
Some parameters have a important role. These are the maximum magnitude, the b-value of the Gutenberg–Richter (GR) frequency-magnitude (FMD) relation, and a parameter related to the seismic activity [1,2,3,4,5,6,7,8,9,10,11,12,13]
The size of the earthquakes is usually given in moment magnitude (Mw) [35], as it has a direct relation with the released energy through scalar seismic moments and does not get saturated for larger events
Summary
These are the maximum magnitude (recorded, possible, expected), the b-value of the Gutenberg–Richter (GR) frequency-magnitude (FMD) relation, and a parameter related to the seismic activity (mean seismic activity rate or the a-value of GR) [1,2,3,4,5,6,7,8,9,10,11,12,13] Some of these studies are based on seismic zonations [1,2], and others are found in a purely geographical grid division [7,11,14,15]. The size of the (non-small) earthquakes is usually given in moment magnitude (Mw) [35], as it has a direct relation with the released energy through scalar seismic moments and does not get saturated for larger events To this end, both global and regional parameters can be found in the literature to convert both intensities and different magnitude types into Mw [35,36,37].
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