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1980 El Asnam earthquake

7.1 magnitude earthquake on the Algerian coast

Field	Value
title	1980 El Asnam earthquake
timestamp	1980-10-10 12:25:23
isc-event	636856
anss-url	usp0001a5w
local-date
local-time	13:25:23
map2	{{Location map+	Algeria
{{Location map~	Algeria	lat	36.77	long=3.22	label=Algiers	label_size=120	mark=Green pog.svg}}
{{Location map~	Algeria	lat	36.2	long=1.37	mark=Bullseye1.png	marksize=40}}
{{Location map~	Algeria	lat	35.7	long=-0.63	label=Oran	label_size=120	position=left	mark=Green pog.svg}}
relief	1
width	250
float	right
caption	}}
image	1980 El Asnam earthquake ShakeMap.jpg
magnitude	7.1
depth	10 km
location
type	Dip-slip
fault	El Asnam
countries affected	Chlef Province
Algeria
duration	35 seconds
intensity
tsunami	0.7 m
aftershocks	6.2 Oct 10 at 15:39 UTC
casualties	2,633–5,000 dead
8,369–9,000 injured

| isc-event = 636856 | anss-url = usp0001a5w | local-date = | local-time = 13:25:23 Algeria 8,369–9,000 injured

The 1980 El Asnam earthquake occurred on October 10 at 13:25:23 local time with a moment magnitude of 7.1 and a maximum Mercalli intensity of X (Extreme). The shock occurred in the Algerian town of El Asnam (now known as Chlef). The shocks were felt over 550 km away, with the initial earthquake lasting 35 seconds. It was the largest earthquake in Algeria, and was followed three hours later by a magnitude 6.2 aftershock. The earthquake created about 42 km of surface rupture and had a vertical slip of up to 4.2 m. No foreshocks were recorded. The earthquake was found to have occurred very close to the epicenter of the 1954 Chlef earthquake using joint epicenter determination techniques.

The earthquake was the largest in the Atlas range since 1790.

In addition to the earthquake, weak tsunami waves were recorded on tide gauges.

The earthquake occurred at a populated region of Algeria, affecting 900,000 people. It destroyed 25,000 houses and made 300,000 inhabitants homeless. The earthquake caused approximately $5.2 billion in damage, which was 22% of Algeria's GDP at the time.

Notes

References

"Comments for the Significant Earthquake".
Ambraseys, Nicolas. (1981). "The El Asnam (Algeria) earthquake of 10 October 1980; conclusions drawn from a field study". Quarterly Journal of Engineering Geology and Hydrogeology.
"Comments for the Significant Earthquake".
"El Asnam Algeria 1980 (CAR)".
ISC. (2015). "ISC-GEM Global Instrumental Earthquake Catalogue (1900–2009)". [[International Seismological Centre]].
National Geophysical Data Center / World Data Service (NGDC/WDS). (1972). "Significant Earthquake Database". [[National Geophysical Data Center]], [[National Oceanic and Atmospheric Administration.
Dewey, J. W.. (1991). "The 1954 and 1980 Algerian earthquakes: Implications for the characteristic-displacement model of fault behavior". Bulletin of the Seismological Society of America.
(September 4, 2009). "PAGER-CAT Earthquake Catalog". United States Geological Survey.
(1997). "The Geology of Earthquakes". [[Oxford University Press]].

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