1.3 The P-wave velocity of the earth’s mantle at the Mohorovicic discontinuity is
(A) 5.5 km/s
(B) 6.0 km/s
(C) 7.0 km/s
(D) 8.0 km/s
The Moho is the boundary between the crust and the mantle in the earth.
The boundary is between 25 and 60 km deep beneath the continents and between 5 and 8 km deep beneath the ocean floor.
Typical values for P-wave velocity in earthquakes are in the range 5 to 8 km/s. The precise speed varies according to the region of the Earth's interior, from less than 6 km/s in the Earth's crust to 13.5 km/s in the lower mantle, and 11 km/s through the inner core.
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