★ Must-know
📌 A positive gravimetric anomaly occurs when actual gravity exceeds theoretical gravity and indicates denser rocks, whereas a negative anomaly occurs when theoretical gravity exceeds actual gravity and indicates less dense rocks such as salt domes.
Further detail
1. What limits direct investigation of Earth’s interior?
2. How does the gravimetric method identify a gravity anomaly?
3. What does a positive gravimetric anomaly indicate?
What limits direct observation of Earth's interior?
Volcanic eruptions and drilling reaching only 3% depth.
What does the gravimetric method measure?
The actual value of gravity with gravimeters.
How does the gravimetric method use theoretical gravity?
It compares actual gravity to theoretical gravity expected from altitude and latitude.
What does a positive gravimetric anomaly indicate?
Denser rocks where actual gravity exceeds theoretical gravity.
What does a negative gravimetric anomaly indicate?
Less dense rocks like salt domes where theoretical gravity exceeds actual gravity.
What type of wave are P waves and through which media do they propagate?
P waves are longitudinal and propagate through solids, liquids, and gases.
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