TY  - JOUR
A1  - Pilz, Marco
A1  - Parolai, Stefano
A1  - Stupazzini, Marco
A1  - Paolucci, Roberto
A1  - Zschau, Jochen
T1  - Modelling basin effects on earthquake ground motion in the Santiago de Chile basin by a spectral element code
T2  - Geophysical journal international
N2  - Simulations of strong ground motion within the Santiago de Chile Metropolitan area were carried out by means of 3-D deterministic wave propagation tool based on the spectral element method. The simulated events take into account the pronounced interface between the low-velocity sedimentary basin and the bedrock as well as topography of the area. To verify our model we simulated a regional earthquake recorded by a dense network installed in the city of Santiago for recording aftershock activity after the 2010 February 27 Maule main shock. The results proof the alluvial basin amplification effects and show a strong dependence of spectral amplification in the basin on the local site conditions. Moreover, we studied the seismic response due to a hypothetical M(w) = 6.0 event occurring along the active San Ramon Fault, which is crossing the eastern edge of the city. The scenario earthquakes exhibit that an unfavourable interaction between fault rupture, radiation mechanism and complex geological and topographic conditions in the near-field region may give rise to large values of peak ground velocity in the basin. Finally, 3-D numerical predictions of ground motion are compared with the one computed according to ground motion prediction equations selected among the next generation attenuation relationships, in terms of ground motion peak values and spectral acceleration. The comparison underlines that the 3-D scenario simulations predict a significantly higher level of ground motion in the Santiago basin, especially over deep alluvial deposits. Moreover, also the location of the rupture nucleation largely influences the observed shaking pattern.
KW  - Earthquake ground motions
KW  - Site effects
KW  - Wave propagation
KW  - South America
Y1  - 2011
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/36526
SN  - 0956-540X
VL  - 187
IS  - 2
SP  - 929
EP  - 945
PB  - Wiley-Blackwell
CY  - Malden
ER  -