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Effects of Random Small-Scale Heterogeneities in 1D, 2D and 3D Modeling of Earthquake Ground Motion in a Halfspace and in a Local Sedimentary Basin

Description: 

The effect of random small-scale heterogeneities in lithosphere and crust has been well recognized for more than a half of century. There is an increasing number of indications that random heterogeneities can play an important role also in modelling earthquake ground motion especially in local surface sedimentary and topographic structures. The problem is being addressed recently in observational and numerical-modeling studies.

We present results of comparison of effects of Random Small-scale Heterogeneities in 1D, 2D and 3D Modeling of Earthquake Ground Motion in two very different macroscopic models - a halfspace and a local sedimentary basin in Colfiorito, Italy.

The main reason for the analysis of results of extensive finite-difference simulations of seismic motion was to look at differences in seismic motions due to reduced dimensionality of the 3D problem. While it is obvious that 3D modeling would be a prime wish and approach, the real practice often restricts numerical-modeling approach to 2D or, even worse, to 1D case due to a variety of reasons, e.g., high computational demands, practical limitations in data and/or knowledge of a local structure.

Our analysis is thus related also to a practical aspect/question in earthquake ground motion analysis and prediction – the possibility to estimate 3D effects of random small-scale heterogeneities based on 2D or even 1D numerical simulations.

Session: Numerical Modeling in Seismology: Developments and Applications [Poster]

Type: Poster

Date: 4/20/2023

Presentation Time: 08:00 AM (local time)

Presenting Author: Martin Galis

Student Presenter: No

Invited Presentation: 

Authors