3D simulation of earthquakes and seismic hazard in the Grenoble’s basin (Western Alps).

摘要

The town of Grenoble (Western Alps) is characterized by a localization on a deepsediment-filled basin and the proximity of active faults. We have used a 3D finite differencemethod to simulate ground motion in the Grenoble area. Simulation are carried out for hypotheticalearthquakes on potential active faults in the Grenoble area. Results show that sites with the largestparticle velocities and durations time of motion overlie the deepest part of the basin (Grenobledowntown). Peak velocity and motion duration in the Gresivaudan and Voreppe Valleys arestrongly dependent on the location of the earthquake. As a check of the validity of our simulationswe compare our 3D synthetic seismogram to observed records of the magnitude 2.5 Lancey earthquake.