![]() As such, they account for path effects incurred during propagation of the waves from the earthquake to the receiver site. For each asperity, records from a small or moderate earthquake were used as proxies for the Green’s functions. We distributed asperities where large surface fault displacements have been inferred from paleoseismic studies. ![]() Large accelerations are generated from localized asperities while the ground motions resulting from the rest of the fault rupture area are negligible. Calculations for synthetic seismograms are based on a validated algorithm for large crustal earthquakes. We subsequently superimposed the effects of soft soil condition on the modelled ground motions. We computed the ground motion for generic rock sites in Christchurch. ![]() By using conservative parameters, we are attempting to model maximum possible ground shaking intensity. In this preliminary study, we chose conservative values for all source parameters based on our current understanding of large crustal earthquake source mechanics. We have computed broadband synthetic seismograms in Christchurch for a large possible Alpine fault earthquake. ![]() Preliminary broadband modelling of an Alpine Fault earthquake in Christchurch. ![]()
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