Moho
The center of a seismic wave is called the focus or hypocenter. This is the point within the Earth where the seismic waves originate.
As depth within Earth's interior increases, the density also increases. This is because the pressure and temperature increase with depth, causing the materials in the Earth to become more compact and thus more dense.
Pressure and temperature increase with depth within Earth's interior, while density and seismic wave velocity also tend to increase.
The band around the Earth where seismic waves are not detected is called the "shadow zone." This region exists between 105 to 140 degrees from the epicenter of an earthquake and is caused by the refraction of seismic waves within the Earth's core. It is divided into two main parts, the P-wave shadow zone and the S-wave shadow zone.
Seismic waves are generated when there is a sudden release of energy from within the Earth's crust, such as an earthquake or explosion. This energy travels through the Earth as waves, causing the ground to shake. The type of seismic wave produced depends on the type of energy release and the properties of the Earth's layers it travels through.
The Moho
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The center of a seismic wave is called the focus or hypocenter. This is the point within the Earth where the seismic waves originate.
Disturbances within the earth crust, such as plate movements.
The structure of Earth's interior affects seismic wave speed and direction differently at different boundaries. As P waves enter the mantle, they pick up speed until they enter the core, where the wave paths are bent sharply.
As distance from the epicenter increases, the lag time also increases. This is because it takes time for seismic waves to travel through the Earth's layers and be detected by seismometers. The lag time can vary depending on the speed of the seismic waves and the distance they need to travel.
Evidence such as seismic waves and the behavior of earthquake waves suggest that there are solid and liquid zones within Earth. Seismic waves change speed and direction when passing through different layers of the Earth, indicating varying compositions. Additionally, the way seismic waves are reflected and refracted also points to the existence of distinct solid and liquid layers within the Earth.
A seismometer is the instrument used to measure waves, such as seismic waves, within the Earth. This device detects and records the vibrations caused by seismic events like earthquakes. Seismometers are essential tools for studying the structure and properties of the Earth's interior.