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Exercice : Calcul de la profondeur de la discontinuité du Moho Lire ...

Exercice : Calcul de la profondeur de la discontinuité du Moho Lire ...

Exercice : Calcul de la profondeur de la discontinuité du Moho Lire ...

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Correction exercice<br />

36 Km<br />

V = D ÷ T<br />

V = 10 ÷ 1.82 = 5.5 Km/s<br />

D = V × T<br />

Tir <strong>de</strong> mine<br />

D = 5.5 × 13.09 = 72 Km<br />

72 ÷ 2 = 36 Km<br />

A<br />

C<br />

Considérons le triangle ayant pour cotés A ÷2 B C<br />

A ÷ 2 = 5 Km B = 72÷2 =36 km<br />

Triangle rectangle: (a÷2) 2 + c 2 = B 2<br />

C 2 = B 2 - (a÷2) 2 C 2 = (36) 2 – (5) 2 = 1296 – 25 = 1271 C = 35, 65 Km<br />

La <strong>discontinuité</strong> <strong>de</strong> <strong>Moho</strong>rovicic ou <strong>Moho</strong> est localisée sous le massif central à 36.65 Km <strong>de</strong><br />

profon<strong>de</strong>ur. Cette <strong>discontinuité</strong> sépare <strong>la</strong> croûte continentale (granite, gneiss V = 5.5 Km/s)<br />

<strong>du</strong> manteau.<br />

Sismographe n°2<br />

B<br />

Croûte continentale, granite et<br />

gneiss<br />

Discontinuité <strong>du</strong> <strong>Moho</strong>

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