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1954 Chlef earthquake
The 1954 Chlef earthquake struck Chlef Province in Algeria on September 9. Measuring 6.8 on the Richter scale, it killed 1,250 people and injured 3,000, destroying Chlef, then named Orléansville. It was followed by multiple aftershocks. Algeria faces annual earthquakes and has undergone several changes to its earthquake building codes since its first earthquake engineering regulations from 1717.
== Geology ==
Powerful earthquakes strike Algeria annually, ranging in Mercalli intensity scale intensity from VI (Strong) to XI (Extreme).〔 Chlef was hit by another major earthquake in 1980 which killed 3,500 people.〔 The Atlas Mountains area faces aseismic deformation (change in shape not originating from movement of faults), with only marginal plate shifting each year. Both Chlef earthquakes originated from the same reverse fault zone.
The 1954 earthquake measured 6.8 on the Richter scale according to the United States Geological Survey〔 and had a depth of .〔El-Robrini, Gennesseaux, and Mauffret, pg 171.〕 There is evidence of crustal shortening along a NW-SE trend near the epicenter, but the structure of any faults is poorly understood.〔 Because Algeria has a thin shelf and a steep coastal slope, submarine landslides are quite common, especially during earthquakes.〔El-Robrini, Gennesseaux, and Mauffret, pgs 171-2.〕 During the 1954 earthquake, five underwater telephone cables in the Mediterranean Sea〔 were cut by an avalanche, three recording the exact time of impact.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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