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The Great Lisbon Earthquake and Tsunami of 1 November 1755 - by Dr. George Pararas-Carayannis (3493 words) |
 | Also, the first wave in 1755 was negative, which indicates that the wave originated from a region of subsidence, while the 1969 wave was positive from an area of upthrust. |
| It is believed that the tsunamigenic efficiency of the 1755 Lisbon earthquake was greater because of large scale subsidence caused by continent to continent convergence and compression. |
| Although the Lisbon earthquake of 1755 was a rare and unusual combination of seismic and tsunami events, a recurrence in the future is a certainty. |
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