Attenuation of Intensity for the Zemmouri Earthquake of 21 May 2003 (Mw 6.8): Insights for the Seismic Hazard and Historical Earthquake Sources in Northern Algeria - Historical Seismology: Interdisciplinary Studies of Past and Recent Earthquakes - page 326

(E)

Fit attenuation in the azimuth perpendicular to the fault
azimuth using isoseismals:
Coef of determination = 0.88

I = I 0 +0.159-0.004 D-2.325 log( D)

-

-

-

-

Distance

Blida mounts (hardrock) Atlas ranges. (1) (2) External zones (hardrock) (3)

River gravels, alluvium, quaternary gravels and Terraces (crumbly)

Plio-quaternary sedimentary basin

(Neogene gravels and marls (soft rock) (4)

(F)

0.6

The mean empirical Ambraseys (1995) Attenuation law

The 2003 earthquake recorded PGA (Laouami et al, 2004)

0.4

0.2

0

0 40 80 120 160 200

Distance

(G)

0.8

Zemmouri
Boumerdes
Corso

0.7

?

0.6

Dar le beida

0.5

P
G
A

0.4

Keddara

Kouba

0.3

H. Dey

Tizi ouzou

0.2

EI Affroun

Azazga

0.1

Blida
Tipaza

Miliana

4 5 6 7 8 9 10

Intensity