摘要 : The Great Lisbon earthquake has the largest documented felt area of any shallow earthquake and an estimated magnitude of 8.5-9.0. The associated tsunami ravaged the coast of SW Portugal and the Gulf of Cadiz, with run-up heights r... 展开 The Great Lisbon earthquake has the largest documented felt area of any shallow earthquake and an estimated magnitude of 8.5-9.0. The associated tsunami ravaged the coast of SW Portugal and the Gulf of Cadiz, with run-up heights reported to have reached 5-15 m. While several source regions offshore SW Portugal have been proposed (e.g.- Gorringe Bank, Marquis de Pombal fault), no single source appears to be able to account for the great seismic moment as welt as all the historical tsunami amplitude and travel time observations. A shallow east dipping fault plane beneath the Gulf of Cadiz associated with active subduction beneath Gibraltar, represents a candidate source for the Lisbon earthquake of 1755. 收起