Empirical model for rapid macroseismic intensities prediction in Guadeloupe and Martinique | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

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  Empirical model for rapid macroseismic intensities prediction in Guadeloupe and Martinique

Type de publication:

Journal Article

Source:

Comptes Rendus Geoscience, Volume 343, Ticket 11-12 (2011)

ISBN:

1631-0713

Numéro d'accès:

WOS:000299196600001

Mots-clés:

UMR 7154 ; Volcanologie ; Earthquake; Ground motion; Macroseismic intensity; Lesser Antilles; Peak ground acceleration ; Séisme; Mouvements du sol; Intensité macrosismique; Petites Antilles; Accélérations maximales du sol

Résumé:

We describe a simple model for prediction of macroseismic intensities adapted to Guadeloupe and Martinique (Lesser Antilles), based on a combination of peak ground acceleration (PGA) predictive equation and a forward relation between acceleration and intensity. The PGA predictive equation is built from a 3-parameter functional form constrained by measurements from permanent accelerometer stations, mostly associated with Les Saintes crustal earthquake (21/11/2004, Mw=6.3) and its many aftershocks. The forward intensity model is checked on a database of recent instrumental events of various origins with magnitudes 1.6 to 7.4, distances from 4 to 300 km, and observed intensities from I to VIII. Global sigma residual equals 0.8 in the MSK scale, suggesting a larger applicability range than the intermediate PGA predictive equation. The model is presently used by the French Lesser Antilles observatories to produce automatic reports for earthquakes potentially felt.