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the algerian shocks till 1969 using the various documents and publications
found in the Seismological Center of Algiers. Various methods used for the
near shocks ( < 700 km) first and for the farther events later, show that:
— The velocities are: Pg = 5,55 km/s, Sg = 3,22 km/s, Pn = 7,77 km/s,
Sn = 4,32 km/s at least for the smaller distances; these velocities, relatively
little, become greater for distances above 800 km, which means certainly
a great increase of velocity in the upper mantle.
— There is no significant variations of velocity between the regions
of Algiers and Sótif.
— The algerian shocks are shallow: most of them have a depth less
than 15 km.
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