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The lag time between the arrival of P-waves and S-waves generally gets longer the further you are from the earthquake's epicenter. P-waves travel faster than S-waves, so the time difference between their arrivals increases with distance.

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1y ago

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How do you figure out the distance of an epicenter?

The distance of an epicenter from a seismograph station can determined by the time it takes for the seismic waves to reach each station. You need at least 3 seismic stations to record the event to determine this. The time taken for each seismic station to resisted the event will be different as they are different distances from the epicenter. The distance to the epicenter can then be calculated for each station and a epicenter can be determined by a triangulation from all stations that have registered the event.


When the distance to the epicenter increases how does the amount by which the s waves lags behind the p wave change?

As the distance to the epicenter increases, the time difference between the arrival of P and S waves also increases. This is because S waves travel at a slower speed than P waves and take longer to reach a seismograph station. The lag between the two waves can be used to determine the distance to the earthquake epicenter.


Can s-p time method be used with one seismograph station to locate the epicenter of and earthquake?

No, the S-P time method requires data from at least three seismograph stations to triangulate the epicenter of an earthquake. With only one station, it is not possible to accurately determine the epicenter.


What is the fewest number of seismographic stations that must record the arrival time of P and S waves in order for the epicenter of an earthquake to be located?

At a minimum, three seismographic stations are needed to triangulate the epicenter of an earthquake. By comparing the arrival times of P and S waves at each station, the distance from each station to the epicenter can be determined. The intersection of these circles of possible epicenter locations from each station narrows down the epicenter's location.


What is the distance of a station from the epicenter if the s-p lag time is measured to be 35.5 seconds?

The distance of a station from the epicenter can be calculated using the formula: Distance (in kilometers) = (s-p lag time in seconds) × 8, where the 8 represents the speed of seismic waves. So, if the s-p lag time is 35.5 seconds, the distance from the epicenter would be 35.5 × 8 = 284 kilometers.

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