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# What is the relationship between the epicenter and the focus?

## What is the relationship between the epicenter and the focus?

The hypocenter is the point within the earth where an earthquake rupture starts. The epicenter is the point directly above it at the surface of the Earth. Also commonly termed the focus.

### How does the wave from the focus travel to the epicenter?

The epicenter is the point on the Earth’s surface directly above the focus. Figure 18.3: When the two blocks on either side of a fault plane suddenly slip, the energy travels outward from the focus as intense vibrations called seismic waves. These waves cause the ground near the epicenter to shake violently.

How does the intensity of an earthquake change with increasing focus depth?

The strength of shaking from an earthquake diminishes with increasing distance from the earthquake’s source, so the strength of shaking at the surface from an earthquake that occurs at 500km deep is considerably less than if the same earthquake had occurred at 20 km depth.

Which of the following statements describes the relationship between the epicenter and focus of an earthquake?

Which of the following statements describes the relationship between the epicenter and focus of an earthquake? The epicenter is the point on Earth’s surface that lies directly above the focus. Which of the following is least likely to cause deaths during an earthquake? How is the intensity of an earthquake measured?

## Which wave travels out of the focus in all directions?

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Body waves. Body waves radiate outward from the focus in all directions and travel through solid rock. A P body wave (primary body wave) is a compressional (longitudinal) wave that induces the particles in the rock to vibrate back and forth in the same direction the wave moves.

### How are epicenters determined?

Scientists use triangulation to find the epicenter of an earthquake. When seismic data is collected from at least three different locations, it can be used to determine the epicenter by where it intersects. Each seismograph records the times when the first (P waves) and second (S waves) seismic waves arrive.

What happens to the intensity of the earthquake as the distance from the epicenter increases?

Since intensity decreases with distance from the earthquake, a large deep earthquake, which solely because of its depth is far from Earth’s surface, produces small shaking intensity. Thus we cannot use intensity to accurately compare the relative size of shallow and deep earthquakes.

How is the epicenter of an earthquake different from the focus why are both terms useful?

The focus is the point within the earth where seismic waves originate; it is centered on the part of the fault that has the greatest movement. The epicenter is on the earth’s surface directly above the focus. Earthquakes generally occur near faults where there is a lot of stress.

## What’s the difference between an epicenter and a focus?

The focus is the exact point inside the crust of the earth where the quake begins, while the epicenter is the point on the earth’s surface directly above the focus. At the focus, the rocks shift and the existing fault line in the earth ruptures, causing the earthquake.

### Why is the epicenter of an earthquake called the hypocenter?

The epicenter is the point on land directly above the focus. Focus of an earthquake. The focus is also called the hypocenter of an earthquake. The vibrating waves travel away from the focus of the earthquake in all directions. The waves can be so powerful they will reach all parts of the Earth and cause it to vibrate like a turning fork.

How can you tell the epicenter of an earthquake?

News stories about earthquakes. Most news stories on earthquakes will list the epicenter of an earthquake and then tell how deep the earthquake was from the epicenter. Great earthquakes that occur in subduction zones may give an earthquake focus but they actually break along hundreds of kilometers.

Which is the focus point of an earthquake?

Focus is the point below the surface of the earth where an earthquake originates. This is the point where rocks first rupture or break when an earthquake takes place due to movement of bedrock and release of energy in a violent form.