Mohorovicic discontinuity is commonly defined as the depth at which \(\underline{\hspace{1cm}}\).
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- the p-wave velocity decreases to 5.6 km/sec
- the p-wave velocity exceeds 7.6 km/sec
- the s-wave velocity exceeds 3.57 km/sec
- the p and s waves exceed 5.6 km/sec and 3.57 km/sec respectively
The Correct Option is B
Solution and Explanation
Step 1: Define the Mohorovičić Discontinuity (Moho).
The Moho is the boundary surface between the Earth's crust and the mantle.
Step 2: Describe how it is identified.
It is identified by a distinct and rapid increase in the velocity of seismic waves (both P-waves and S-waves). This is because the mantle below is significantly denser and more rigid than the crust above.
Step 3: Quantify the velocity change.
P-wave (primary wave) velocity in the lower crust is typically 6.7–7.2 km/s. Upon crossing the Moho into the mantle, it abruptly increases to 7.6–8.6 km/s. Therefore, the depth where the P-wave velocity sharply increases to over 7.6 km/s is the defining characteristic of the Moho.
Conclusion: Option (B) provides the best description of this seismic velocity jump.
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