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modeling for a vertically incident plane SH wave. Computations indicate that the southern part of the Colosseum
may be exposed to a seismic ground motion with significantly larger amplitudes, differential motion and
longer duration than the northern part. because the southern part of the Colosseum is underlain by a sedimentfilled
valley created by sedimentary filling of the former tributary of the River Tiber. A 2-D resonance may
develop in the valley. Unlike the previous theoretical studies on 2-D resonance in sediment-filled valleys, an
effect of heterogeneous valley surroundings on the resonance is partly investigated. A very small sensitivity of
the maximum spectral amplifications connected with the fundamental and first higher modes to the presence of
a horizontal surface layer (with an intermediate velocity) in the valley surroundings is observed in the studied
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