### Interpret The Travel-Time Curve Shown. How Far Away Is The Earthquake Epicenter?

- Sabrina Sarro
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The travel-time curve shown in the figure indicates that the earthquake epicenter is located at a distance of about 60 km from the recording station. This is determined by the point at which the first P-wave arrives (marked by the red line in the figure). The travel times of the other waves (S-waves and surface waves) are also shown in the figure, and can be used to determine the distance to the epicenter as well.

Contents

- 1 Earthquake Travel-time Curves: How far away was that earthquake?
- 2 Determining the Epicenter Distance of an Earthquake
- 3 How does the time between P and S wave arrival correlate to distance from the epicenter?
- 3.1 How do you describe the location of earthquake epicenters?
- 3.2 How is the distance to the epicenter of an earthquake found quizlet?
- 3.3 How does distance from the epicenter affect the SP time interval?
- 3.4 How does the time between P and S wave arrival correlate to distance from the epicenter quizlet?

- 4 How do you read a travel time curve?

## Earthquake Travel-time Curves: How far away was that earthquake?

## Determining the Epicenter Distance of an Earthquake

#### How do you find the distance to the epicenter?

The distance to the epicenter can be found by measuring the seismic waves that are emitted during an earthquake. These waves can be recorded by seismometers, which are then used to calculate the distance to the epicenter. The further away the epicenter is, the weaker the seismic waves will be.

## How does the time between P and S wave arrival correlate to distance from the epicenter?

The time between the arrival of the P and S waves at a seismograph station is used to determine the distance from the epicenter of the earthquake. The time is measured in seconds and the distance is calculated in kilometers. By knowing the velocity of the waves, the distance from the epicenter can be determined. The P waves travel at a velocity of about 8 kilometers per second and the S waves travel at a velocity of about 4 kilometers per second.

#### How are seismic travel time curves used to study earthquakes?

Seismic travel time curves are used to study earthquakes by looking at the time it takes for seismic waves to travel through the Earth. By looking at the travel times, scientists can infer the structure of the Earth and the location of the earthquake.

#### How many stations do you need to find the location of the earthquake epicenter )?

In order to find the location of an earthquake’s epicenter, you need to have at least three seismograph stations recording the event. By looking at the arrival times of the seismic waves at each station, you can triangulate the epicenter’s location. The more stations you have, the more accurate your results will be.

### How do you describe the location of earthquake epicenters?

- Earthquake epicenters are locations on the Earth’s surface that are directly above the hypocenter, or the focus, of an earthquake.
- The term was coined in the early 20th century by American geologist Harry Fielding Reid.
- Earthquake epicenters can be described in terms of latitude and longitude, or they can be described in more general terms such as “off the coast of Japan” or “southeastern Alaska.
- “.

### How is the distance to the epicenter of an earthquake found quizlet?

There are a few different ways that the distance to the epicenter of an earthquake can be found. One way is to use a seismograph. A seismograph is a machine that measures the shaking of the ground during an earthquake. By looking at the records from a seismograph, scientists can figure out how far away the earthquake was.Another way to find the distance to the epicenter of an earthquake is to look at the damage that was done. The closer an earthquake is to the surface of the Earth, the more damage it will do. So, by looking at the damage from an earthquake, scientists can figure out how far away the epicenter was.The last way to find the distance to the epicenter of an earthquake is to ask people who felt the earthquake. People who felt the earthquake can tell scientists how strong it was and how long it lasted. By using all of this information, scientists can figure out how far away the epicenter of the earthquake was.

### How does distance from the epicenter affect the SP time interval?

The SP time interval is the time between the arrival of the primary (P) waves and the secondary (S) waves from an earthquake. The SP time interval is directly related to the distance from the epicenter. The farther away from the epicenter, the longer the SP time interval. The SP time interval is also affected by the type of material that the waves are traveling through. For example, S waves do not travel through liquid, so the SP time interval will be longer in an area where the ground is saturated with water.

#### How far do earthquakes travel?

Earthquakes travel in waves, similar to those produced when a stone is thrown into a pond. The waves radiate outwards from the earthquake’s epicenter, the point on the earth’s surface directly above the earthquake’s hypocenter (the point underground where the earthquake originates). The size of an earthquake is determined by the amount of energy released at the hypocenter. This is measured using the Moment Magnitude Scale, which is based on the size of the earthquake’s fault rupture and the amount of displacement of the earth’s surface. The largest earthquakes can have moment magnitudes greater than 9.0, which are capable of causing widespread damage and loss of life.

### How does the time between P and S wave arrival correlate to distance from the epicenter quizlet?

The time between P and S wave arrival correlates to distance from the epicenter in a linear fashion, such that the further away from the epicenter you are, the longer the time between wave arrival. This is due to the fact that P waves travel faster than S waves, and so the time between arrival decreases as distance from the epicenter decreases.

## How do you read a travel time curve?

In order to read a travel time curve, you will need to take into account the distance that the waves have traveled. The travel time is the time it takes for the waves to reach the receiver. The travel time curve will show you the different travel times for different distances. The closer the distance is to the receiver, the shorter the travel time will be.

### How do you find travel time for earthquakes?

There are a few ways to find travel time for earthquakes. One way is to use the arrival times of the P and S waves. The P waves will always arrive first, and the S waves will follow after. By knowing how far away the earthquake is, and the time difference between the P and S waves, you can calculate the travel time. Another way to find travel time is to use seismometers. Seismometers are instruments that measure the shaking of the ground during an earthquake. By knowing the distance between the seismometer and the earthquake, you can calculate the travel time.

#### How do you use an earthquake travel time chart?

- An earthquake travel time chart is used to determine the time it takes for seismic waves to travel from the epicenter of an earthquake to a particular location.
- The travel times are plotted on a graph, with the distance from the epicenter on the x-axis and the travel time on the y-axis.
- To use the chart, you first need to determine the distance from the epicenter to the location of interest.
- This can be done using a map or by measuring the distance directly.
- Once the distance is known, you can find the corresponding travel time on the chart and use this information to estimate the time of the earthquake.

### What is the distance to the epicenter if the difference in the arrival times of the P wave and S wave is 5.5 minutes?

Assuming a spherical Earth, the distance to the epicenter can be calculated using the formula:d = t * vwhere t is the difference in arrival times of the P and S waves, and v is the velocity of the waves. For P waves, the velocity is approximately 7 km/s, and for S waves, the velocity is approximately 4 km/s. Therefore, using the given values, the distance to the epicenter would be:d = 5.5 * 7d = 38.5 km

#### What happens to lag time the further you are from the epicenter?

Lag time is the time between the initial earthquake waves and the arrival of the later, more destructive waves. The further you are from the epicenter, the longer the lag time will be. This is because the waves have to travel further to reach you, and they lose some of their energy along the way. As a result, the waves that reach you will be weaker and will cause less damage.

#### What is the lag time at 2000 km from the earthquake’s epicenter?

At 2000 km from the earthquake’s epicenter, the lag time is approximately 10 minutes. This is because the waves travel at a speed of approximately 20 km per minute. Therefore, it takes approximately 10 minutes for the waves to travel from the epicenter to a distance of 2000 km.

#### How do you find P and S wave travel time?

- To find P and S wave travel time, you need to first identify the type of wave that you are looking for.
- P waves are compressional waves, while S waves are shear waves.
- Once you have identified the type of wave, you can use a seismometer to measure the time it takes for the wave to travel from the earthquake epicenter to the seismometer.