please answer this short questions 6. Give a brief description of each of the th
ID: 107330 • Letter: P
Question
please answer this short questions
6. Give a brief description of each of the three major types of earthquake waves including which two are considered body waves, which moves the fastest, which can move through solids as well as liquids, and which results in the most damage.
7. How many seismographs from separate locations are required to pinpoint the epicenter of an earthquake?
8. How many earthquakes worldwide of magnitude 5 are expected to occur each year? How many of magnitude 6? How many of magnitude 7?
Explanation / Answer
Earthquake is the shaking of the earth causing damage.It is the result of three basic types of elastic waves .
1) primary or p waves
2) Secondary or S waves.
3) Surface waves.
Primary or P waves and secondary or S waves are considered as a body waves.These are named as body waves as they propagate within a body of rock.
Primary or P waves: These are fastest body waves.P waves are able to travel through both solid and liquids.Solids like granite mountains and liquid material such as volcanic magma and ocean water.
Secondary waves:This is the slower wave that passes second to the primary waves.This S wave propagates through the rock,it shears the rock sideways at right angles to the direction of it's propagation.It cannot pass through liquid parts of earth.
These two waves speed depends on the density and elastic properties of the rock.
Surface waves:These are two types.1) love waves
2) Rayleigh waves.
Love waves are similar to S-10 and have vertical displacement.Whereas Rayleigh waves moves both vertically and horizontally in a vertical plane.
7)Q) Ans: Three Seismographs from separate locations are needed to pinpoint the epicenter of an earthquake as the three distances measurements are needed to define a point on a map of which is drawn for the earthquake.
3Q) Ans) Earthquake with magnitude 5 occurs frequently in numbers per year. Earthquake with magnitude 6 occurs in more than fifty per year.Earthquake with magnitude 7 and even more occurs more than once per month.
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