To what extent does seismic investigation contribute to our understanding of the Earth's Interior Structure? Analyse its significance in detail.

Various seismic wave types:

P-waves |

S-waves |-- Various seismic waves

Rayleigh wave |

1. By studying the refraction of various waves

2. The blind zones of P & S-waves show that earth's centre is solid. [E.g] P-waves blocked by solid layer; illustration of blind zone and two blind zone patterns

3. The interpretation only tells us the different density of various layers and the points where it change. [E.g] Lehmann discontinuity, Gutenberg discontinuity

Limitation:

1. It can't tell the exact constituents of various layer. & Requires volcanic precis on extra-terrestrial object analysis

2. Accuracy level in terms of density is subjective.