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A reanalysis of the AD 365 tsunami impact along the Egyptian Mediterranean coast

Hamouda A.

Acta Geophysica

2010

Vol. 58, no. 4

687-704

The historical tsunamigenic event of 21 July AD 365 destroyed several coastal locations in the Eastern Mediterranean region. The foremost destructive impacts were recorded in Crete and Egypt. The present study re-examines the effect of location, direction, height and time of travel of the tsunami towards the Egyptian coast. Evidently, this tsunamigenic event is related to an earthquake which is identified with a Hellenic Arc subduction-zone event of great magnitude, M > 8, as manifested by up to 9 m uplift in western Crete. The maximum run-up height distribution in the front of the Nile Delta was about 9.5 m in Alexandria, while those of the neighboring cities were 7.1 m, 4.9 m, and 1.9 m at Rashid, Damietta and El-Arish, respectively. Data obtained from this study is essential to evaluate the tsunami hazards along the Egyptian coast.

Seismic hazard of the Eastern Mediterranean

Hamouda A.

Acta Geophysica

2006

Vol. 54, no. 2

165-176

Earthquake hazard parameters such as maximum magnitude, annual mean seismic activity rate, and the Gutenberg¨CRichter parameter, have been evaluated for the Hellenic and Cyprean Arc regions of the Eastern Mediterranean. The applied maximum likelihood procedure permits the combination of both historical and instrumental data. The collected data from different sources cover earthquakes with magnitude 3.5 throughout the last two centuries. The historical part of the catalogue only contains the strongest events, whereas the complete part can be divided into several subcatalogues, each assumed complete above a specific threshold of magnitude. The hazard parameters assessment is performed for the two study regions. The Hellenic Arc region was found to be of higher seismicity level than the Cyprean Arc region. The number of annually expected earthquakes with magnitude 3.5 is much larger in the Hellenic Arc (56) than in the Cyprean Arc (35). The maximum magnitude calculated in the Hellenic Arc zone is 7.8 for the time period equal to the length of the catalogue, i.e., 210 years. For the Cyprean Arc zone, the maximum possible magnitude is 6.8ˇŔ0.4 for the time span of 330 years.