Review of the 1755 Lisbon Earthquake Based on Recent Analyses of Historical Observations - Historical Seismology: Interdisciplinary Studies of Past and Recent Earthquakes - page 283

Fig. 18 Aqueduto das Aguas Livres: a) 2-D model and b) in-situ testing to determine frequencies
and modal shapes (Oliveira, 1986)
section, to the right, the soil layer is thinner, and the damage is observed at the upper
floors and might be due to fire, and not so much due to shaking.
Complementary studies are being performed to clarify the behaviour of the
“Torreao” by:
Determining the structural alterations introduced in the present structure along
the times in order to obtain the geometry when the earthquake occurred.
Develop a non-linear finite element model to analyze damage and be able to
foreseen what really has happened.