1755 Lisbon Earthquake

Some earthquakes are so big that it can ruin not only a city or region, but an entire economy. Such was the cased for the 1755 Lisbon earthquake that spelled the beginning of the end of Portugal's global empire. In this episode we look at the characteristics of that earthquake, tsunami and fire.
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[@miguelcoelho3877]

The binding material used on the old wall shown at 7:45 is not mud but mortar (sand, water, and lime). That binding material has stood the test of time, seeing that there is an abundance of buildings, including private houses, castles, bridges, churches, chapels, and forts from the Middle Ages that are to be found throughout Portugal, whose walls have remained intact to this day, for the most part. But, of course, what happened in Lisbon on November the first, 1755, is a completely different kettle of fish, so to speak (no pun intended)...
Good video, nonetheless.

[@myScienceBlast]

True. Old binding material was usually some kind of lime mortar which will shrink and harden when dry, and it is amazing how well these strucures have withstood the test of time. However, these are brittle structures which are not seismo-resistant without some kind of internal reinforcement. Damage to buildings of different dimensions also depends on the frequency content of the seismic waves, but that is the topic for another video. Thanks for your comment, Miguel.