Simultaneous inversion of hypocentral parameters and structure velocity of the central region of Madagascar as a premise for the mitigation of seismic hazard in Antananarivo

摘要

A layered velocity model is obtained using the arrival-time data of P- and S-waves from local earthquakes for the Central Region of Madagascar. A damped least squares method is applied in the inversion of the data. The data used are 770 P-wave arrival times for 154 events which have epicenters in the region inside the Malagasy network operated by the Institut et Observatoire de Geophysique d'Antananarivo (IOGA). These data are jointly used in the inversion for the earthquake hypocenters and P- and S-wave velocity models. The reference average model used here is a variant of the model given by RAKOTONDRAINIBE (1977). (author). 24 refs, 9 figs, 8 tabs. (Atomindex citation 27:047235)