The south-eastern Spain is the most active zone of Iberian Peninsula.
Historical record accounts for a number of destructive or damaging earthquakes in the past.
Table I shows the most important ones in the area of the southern peninsula and its proximity, affecting the region of Andalusia. The bigger was probably the one known as the Lisbon earthquake, occurred in 1755 under the Atlantic ocean, south-west of Cape San. Vicente, with an estimated magnitude 8.5 to 9.0, and with an important tsunami, that produced more than fifty thousands of victims. The map of figure shows the isoseismals of most of these earthquakes, as deduced from the available historical data compiled and analysed up to present. Some important earthquakes occurred in the Middle Age have yet to be studied.