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Accueil > Public-Presse > Ressources documentaires > Anciens thèmes de recherche > Manteau, noyau > Structure et dynamique du manteau > Chantiers sismologiques

Global P-polarization seismic coverage

Number of P events, Mb > 6.0, 10°

On a five degree grid has been calculated the number of P-waves waves that could be potentially recorded by using the real seismicity for the year 2002. Events are selected with magnitude larger than 6.0, occurring at distances between 10 and 70 degrees. The pattern observed for the year 2002 indicate that the eastern eurasia, SW pacific, Australia are the best places to use the P waves, with more than 100 events recordable by year. Africa, Americas and Europe are badly placed relative to the global seismicity to have good P-coverage.

P-wave backazimuthal coverage, year 2002

The potential backazimuthal coverage of the P waves is calculated at each five degree grid at the Earth’s surface. Each segment on this map represents the backazimuth of an incoming P wave of magnitude larger than 6.0 and occurring at epicentral distance between 10 and 70 degrees. America and Africa are characterized by poor coverages whereas the Pacific, South-East Asia and South America have good backazimuthal coverages.

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