Basin-related effects on ground motion for earthquake scenarios in the Lower Rhine Embayment

Details Basin-related effects on ground motion for earthquake scenarios in the Lower Rhine Embayment Basin-related effects on ground motion for earthquake scenarios in the Lower Rhine Embayment

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006geoji.166..197e&link_type=abstract

Geophysical Journal International, Volume 166, Issue 3, pp. 197-212.

Astronomy and Astrophysics

Astronomy

2

Deterministic Shaking Hazard, Earthquake Scenarios, Numerical Wave Propagation, Seismic Intensities, Site Effects

Scientific paper

The deterministic calculation of earthquake scenarios using complete waveform modelling plays an increasingly important role in estimating shaking hazard in seismically active regions. Here we apply 3-D numerical modelling of seismic wave propagation to M 6+ earthquake scenarios in the area of the Lower Rhine Embayment, one of the seismically most active regions in central Europe. Using a 3-D basin model derived from geology, borehole information and seismic experiments, we aim at demonstrating the strong dependence of ground shaking on hypocentre location and basin structure. The simulations are carried out up to frequencies of ca. 1 Hz. As expected, the basin structure leads to strong lateral variations in peak ground motion, amplification and shaking duration. Depending on source-basin-receiver geometry, the effects correlate with basin depth and the slope of the basin flanks; yet, the basin also affects peak ground motion and estimated shaking hazard thereof outside the basin. Comparison with measured seismograms for one of the earthquakes shows that some of the main characteristics of the wave motion are reproduced. Cumulating the derived seismic intensities from the three modelled earthquake scenarios leads to a predominantly basin correlated intensity distribution for our study area.

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