Sismo, dia 28 de Fev. 1969

Sismo sentido em todo o Portugal Continental, 28 de Fevereiro de 1969

A intensidade na costa oeste alentejana e algarvia foi de VII, e em Lisboa de VI (Mercalli modificada)... (IM)

• 1969/02/28 02:40:32.7 35-59.1N 10-48.8W D=20 km M=7.3 (Mezcua e Solares, 1983)

Located west of Portugal, the shock killed 13 people (two in Portugal and eleven in Morocco) and injured scores. It was felt as far as 1,300 kilometers from the epicenter - from Bordeaux, France, to the Canary Islands. There was only light damage to modern structures, and because of its distance from populated centers, overall property damage was moderate. In Morocco, the damage was augmented due to saturated soil conditions, caused by heavy rains, that weakened adobe structures.

Ten or more people were killed in the days following the shock, without the impetus of additional shaking, as the weakened walls continued to fail and collapse. In Lisbon, Portugal, numerous cars were demolished by falling chimneys, balconies, and walls, and many were injured by falling debris. Several buildings collapsed in surrounding towns...
(NEIC, http://neic.usgs.gov/neis/history/his_02_28.html )