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Synopsis

Seismology is the scientific study of earthquakes and the propagation of seismic waves through the Earth. It plays a crucial role in understanding the planet’s internal structure, predicting seismic hazards, and developing mitigation strategies. The field has evolved over centuries, combining geological observations with advanced instrumentation to analyze the forces that shape the Earth's surface. 
The Earth's internal structure consists of the crust, mantle, outer core, and inner core. These layers play a fundamental role in the behavior of seismic waves. The crust, the outermost layer, is broken into tectonic plates that move slowly over the more fluid mantle beneath. This movement generates stress along fault lines, eventually leading to earthquakes. The mantle, composed of semi-solid rock, allows for convection currents that drive plate tectonics. The outer core, a molten iron layer, generates Earth's magnetic field, while the solid inner core remains a mystery due to its extreme conditions. 
Seismic waves are the energy waves generated by earthquakes and other seismic events. They are classified into body waves and surface waves. Body waves, which travel through the Earth’s interior, include primary (P) waves and secondary (S) waves. P-waves are the fastest and travel through both solids and liquids, while S-waves move slower and can only propagate through solids. Surface waves, which travel along the Earth's crust, are responsible for most of the destruction during an earthquake.

Durée: environ 3 heures (03:17:40)
Date de publication: 10/03/2025; Unabridged; Copyright Year: — Copyright Statment: —

• Science et Technologie