1956 Amorgos earthquake

Earthquake and tsunami centered near the Greek island of Amorgos 1956 Amorgos earthquake 1956-07-09 03:11:45 888445 iscgem888445 1956 07 09 05:11:45 Greece 7.7 w y 20 km on 36.6664 25.957 inline,title Greece, Santorini and Amorgos IX 30 m on 53 The 1956 Amorgos earthquake occurred at 03:11 UTC on July 9. It had a magnitude of 7.7 on the moment magnitude scale and a maximum perceived intensity of IX on the Mercalli intensity scale. The epicentre was to the south of the island of Amorgos, the easternmost island of the Cyclades in the Aegean Sea. There was significant damage on Amorgos and the neighbouring island of Santorini. It was the largest earthquake in Greece in the 20th century.https://www.researchgate.net/publication/226437052 Seismicity Variations in the Southern Aegean, Greece, Before and After the Large (M7.7) 1956 Amorgos Earthquake Due to Evolving Stress Papadimitriou E., Sourlas G. & Karakostas V. Pure and Applied Geophysics 2005 162 5 783–804 10.1007/s00024-004-2641-z 2005PApGe.162..783P 140605036 It was followed 13 minutes later by a magnitude 7.2 earthquake near Santorini. It triggered a major tsunami with a maximum run-up of 30 m. The combined effects of the earthquake shaking and the tsunami caused the deaths of 53 people with a further 100 injured.http://www.ngdc.noaa.gov/nndc/struts/results?eq_0=4100&t=101650&s=13&d=22,26,13,12&nd=display https://web.archive.org/web/20170113094404/https://www.ngdc.noaa.gov/nndc/struts/results?eq_0=4100&t=101650&s=13&d=22,26,13,12&nd=display dead January 13, 2017 Comments for the Significant Earthquake National Centers for Environmental Information 22 February 2016Okal EA The 1956 earthquake and tsunami in Amorgos, Greece Geophysical Journal International 178 3 1533–1554 2009 10.1111/j.1365-246X.2009.04237.x 2009GeoJI.178.1533O free Tectonic setting The Cyclades island group lies within a zone of extensional tectonics in the Aegean Sea plate, between the South Aegean Volcanic Arc to the south and the continuation of the North Anatolian Fault to the north. The extension is a result of the bulging out of the Hellenic arc due to flat-slab subduction of the African plate.ten Veen J.H. Kleinspehn K.L. 2003 Incipient continental collision and plate-boundary curvature: Late Pliocene–Holocene transtensional Hellenic forearc, Crete, Greece Journal of the Geological Society 160 2 161–181 10.1144/0016-764902-067 http://jgs.geoscienceworld.org/cgi/content/abstract/160/2/161 2003JGSoc.160..161T 219542417 subscription Earthquake The earthquake's focal mechanism is consistent with normal faulting, trending SW-NE. From the distribution of aftershocks, it is possible to discriminate between the two nodal planes implied by the focal mechanism, indicating that the fault plane dips to the southeast at about 25°. The rupture area is estimated to be about 110 km along strike and 26 km in depth, extending into the upper mantle.https://www.researchgate.net/publication/248516017 Crustal rheology of the Santorini–Amorgos zone: Implications for the nucleation depth and rupture extent of the 9 July 1956 Amorgos earthquake, southern Aegean Konstantinou K.I. Journal of Geodynamics 2010 50 5 400–409 10.1016/j.jog.2010.05.002 2010JGeo...50..400K Tsunami The tsunami affected a large part of the Aegean Sea. The variable distribution of the observed run-ups, combined with inconsistent timing of the wave arrivals at different locations, suggest that earthquake-triggered underwater landslides were the main cause of the observed tsunami. Damage Damage was severe, particularly on Santorini. The earthquake demolished 529 houses and left many others damaged. Fifty-three people were killed as a result of the earthquake, with another three killed by the associated tsunami.http://www.ngdc.noaa.gov/nndc/struts/results?eq_0=4100&t=101650&s=18&d=99,91,95,93&nd=display https://web.archive.org/web/20170113095251/https://www.ngdc.noaa.gov/nndc/struts/results?eq_0=4100&t=101650&s=18&d=99,91,95,93&nd=display dead January 13, 2017 Comments for the Tsunami Event National Centers for Environmental Information 22 February 2016 See also List of earthquakes in 1956 List of earthquakes in Greece 2025 Santorini earthquakes References Further reading Leclerc Frédérique Palagonia Sylvain Feuillet Nathalie Nomikou Paraskevi Lampridou Danai Barrière Paul Dano Alexandre Ochoa Eduardo Gracias Nuno Escartin Javier Large seafloor rupture caused by the 1956 Amorgos tsunamigenic earthquake, Greece Communications Earth & Environment 5 1 2024 2662-4435 10.1038/s43247-024-01839-0 free External links 888445 Category:Earthquakes in Greece Category:1956 earthquakes Category:1950s tsunamis Category:1956 in Greece Category:July 1956 in Europe Category:Amorgos Category:Tsunamis in Greece Category:1956 disasters in Greece