Explanation:
Question 1:
It is better to use data from three or more seismic stations to find the epicenter of an earthquake because it gives a precise and accurate location better than using a lesser amount of data.
Finding epicenter of an earthquake works on the basis of triangulation.
- The intersection between three circles gives the epicenter.
- To triangulate, we simply use a radius value to draw a circle of appropriate size.
- This is the distance of the station from the earthquake.
- We know using seismograph that the first wave to arrive a point is the p-waves and the s-waves follows.
- Disparity between the time of arrival and the velocity of the wave can give us the distance the wave must have traveled.
- We take this data and draw circle of appropriate radius indicating the probable regions where the epicenter might be located.
- This is a wide and indefinite volume of space.
- Three circles using data from two more stations will give a perfect intersection.
- More stations will further improve the accuracy and then we are sure of where the epicenter is.
learn more:
Epicenter brainly.com/question/11292835
Question 2:
P and S-waves are seismic elastic waves that travels within the earth. They are usually produce when a huge vibration travels within a substance or within the earth.
After the passing of the wave, the body returns back to its original form.
P-waves:
- They are called primary waves.
- They have the fastest velocity and the are the first to be picked up at a seismic station.
- They can propagated through any material.
- These waves are longitudinal waves moving in a series of rarefaction and compression.
S-waves:
- They are secondary or shear-waves.
- They are the second to arrive seismic station.
- They cannot pass through fluids because they do not shear.
- They are transverse waves that travels perpendicular to their source.
learn more:
Earthquake brainly.com/question/6520403
Question 3:
If a seismogram from a particular seismic station shows only P-waves, one can conclude that the material is only made up of fluid materials.
- P-waves are primary waves capable of moving in any material medium.
- They are longitudinal waves that propagates parallel to their source.
- The reason why we cannot pick other seismic waves is that, s-waves cannot pass through fluids.
- S-waves are secondary or shear waves.
- Fluids cannot be sheared.
- Only solids can shear.
- Therefore, we can imply that since we see only p-waves the material is made up of only fluids.
learn more:
Seismic brainly.com/question/6520403
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