To what extent does seismic investigation contribute to our understanding of the Earth's interior structure? Analyse its significance in detail. (Answer in 150 words) 10 marks
Main Body
Seismic waves generate as a result of release of energy inside the Crust, due to movement and pulverisation of rocks.
8 types of waves:
Details about Earth's Interior:
[Answer continues on next page - marked by 'P-U-S waves' notation and further text below]
marked by absence of P-U waves => Liquid outer core
(ii) Inner core => P-waves move towards core, with increased velocity => Indicates presence of solid inner core, dense (NIFE). P-wave swaves. [Diagram showing P-waves, S-waves, molten layer, 100 km, 400 km, 700 km distances and circular cross-section showing inner core, outer core, S-waves, and 180°, 105° angle measurements]
Therefore, P & S waves, along with lava, meteors, drilling projects reveal important information about Earth's interior.
Diagram
Two diagrams: (1) P and S wave propagation through Earth's layers showing 100 km, 400 km, 700 km depths and molten layer; (2) Cross-section of Earth showing inner core, outer core, S-waves, P-waves, and shadow zones at 180° and 105° angles
- Systematic classification of seismic wave types and their properties
- Effective use of wave behavior to infer internal structure
- Clear explanation of shadow zones indicating liquid outer core
- Integration of multiple data sources (waves, lava, meteors, drilling)
- Strong connection between methodology and conclusions about Earth's interior
- Well-labeled diagrams supporting the explanation
Ritika Chitlangia
Salient features of World's Physical Geography
Important Geophysical Phenomena
Seismic waves and Earth's interior
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