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10
+
+
Zemmouri 2003 earthquake
Villebourg 1891 earthquake
Djidjelli 1856 Earthquake
+
8
+
Fit attenuation using the three offshore
comparative earthquakes
I
=
a+b*D+c*Log(D)
(a
=
13.58, b
=
-0.0034, c
=
-3.99)
Coef of determination
=
0.918042
+
6
+
+
4
+
+
2
0
100
200
300
400
Fig. 8
Attenuation regression curve computed for the Djidjelli, Villebourg and Zemmouri earth-
quakes, using isoseismals
which should be expected in the future, accompanied by geodetic effects and
tsunamis. The comparison between the three reviewed earthquakes shows the poten-
tial for destructive seismic events and the presence of seismogenic sources along the
coastline.
Acknowledgments
This article is dedicated to Jean Vogt who showed a constant interest in the
historical seismicity of Algeria. Anonymous reviewers are gratefully acknowledged for critically
reading the manuscript and helpful suggestions. This research is supported by CRAAG and bene-
fited from the ICTP-OEA (Trieste) Programme in the framework of the North African Seismologi-
cal Group (NASG). The field investigations were also supported by the INSU research project ACI
Cat-Nat “Risque sismique de la region d'Alger”.
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