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| Titel |
Earthquakes and tsunami in November 1755 in Morocco: a different reading of contemporaneous documentary sources |
| VerfasserIn |
P.-L. Blanc |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 9, no. 3 ; Nr. 9, no. 3 (2009-05-14), S.725-738 |
| Datensatznummer |
250006781
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| Publikation (Nr.) |
 copernicus.org/nhess-9-725-2009.pdf |
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| Zusammenfassung |
| Tsunami seldom strike the European Atlantic shores. The great Lisbon
Earthquake of 1 November 1755 is the main destructive tsunamigenic event
recorded. Since the mid-1990's, many simulations of propagation of tsunami
waves from variants of the possible seismic source have been conducted.
Estimates of run-up in Morocco are seldom included in publications, maybe
for want of reliable historical data to control the simulations. This paper
revisits some early accounts, transmitted as translations to European
Chanceries, Scientific Societies and Newspapers. A critical analysis of the
documents leads us to conclude that the Lisbon earthquake was overestimated
because of amalgamation with a later Rifian earthquake. Then, the
overestimation of the tsunami through worst interpretation of the scant data
available appeared only reasonable, while the moderate measurements or
interpretations were not given their due attention. In Morocco the amplitude
of the tsunami (i.e. height at shoreline minus expected tide level) may not
have exceed the measurement given by Godin (1755) for Cadiz, 2.5 m above the
calculated astronomical tide, a crest-to-trough amplitude of 5 m at most.
This age-old overestimation of both the earthquake and tsunami is
detrimental to the evaluation of the risk for coastal people and activities. |
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