Seismic Refraction
Seismic refraction is a method of measuring the travel and pattern of seismic waves through matter
. Here the seismic energy is shot into the surface and the radiation of energy from the shot point is observed and recorded. Here the energy radiation is through the different sub layers of the surface as well as the waves travel back to the surface after bouncing off of matter. These radiations that return are detected on geophones.
Detail Description of Seismic Refraction:
Image of Seismic energy shot using a sledgeha
Image of Seismic energy shot using a sledgeha
Seismic means 'caused by earth vibration or vibrations related to earth matter'. The seismic refraction is the refraction of seismic energy passing through earth. This is used for several types of earth surfaces. The earth surface is composed of several types of matter, rocks, soil, mud, dirt, different types of rocks, minerals and many more. Some areas of earth surface are composed of certain matter in greater proportion. The seismic refraction at different areas is different and depends on the energy, the composition of the surface and several other factors.
A measure of seismic refractions involves measuring the time taken for the seismic radiation to return to the geophones and the velocity of the radiation.
To measure seismic refraction at a particular surface, the geophones are installed at several places. Seismic energy is shot into the surface, the energy radiates waves that travel through several sub layers and bounce off of several layers and some return to the surface. This measurement is recorded on geophones and analyses using a computer.
The shot is generated using a sledgehammer or a seismic shot gun into the ground or sometimes by detonating an explosive in the ground.
Applications of Seismic Refraction
Seismic refraction technique has been applied to map depth of backfilled quarries, to measure thickness of overburden, to map the topography of ground water, to measurehte depth of landfills and many more
Conclusion for Seismic Refraction:
Seismic refraction is the refraction of seismic radiation through earth surface. Seismic refraction is used for determining bedrock structures and depth of bedrock. The seismic velocity depends on the elasticity and density of the medium. Thus studying seismic refraction, the rip ability and rock quality can be determined.
Check this
Molar Mass Calculator awesome i recently used to see.
Refraction is the bending of light rays when they travel from one medium to another. This bending of ray occurd due to differenti optical densities of the two medium. Refraction is a visual example of Fermat's Theorem for least time for light rays.
Define Refraction : Concept of Optical Densities in Refraction
In the above definition medium means the substance through light can travel. For example, light cannot travel through solid substances like wood and earth, but it can travel through substances like air, water, a glass, etc., and also through vacuum. These substances through which light travels are known as optical media (singular: optical medium). All optical media have different optical densities, and a medium with greater optical densities offers more obstruction to light rays travelling through it. This is same as walking in on the ground is easier than wading through water, which is still more easier than walking through snow.
Define Regraction: Why Does Refraction Occur?
The speed of light is different in different optical media. For example, in air the speed of light is 3 x 108 m/s and in water it is 2.25 x 108 m/s. This difference exists because different media have different optical densities, and so they slow down the light rays travelling through them. When light rays travel from one medium to the other, for example, from air into water, due to the change in the speed of light, the light rays deviate from their original path and travel in a new path in the second medium. When light rays travelling through the air strike the surface of water, at that moment, a part of the light rays gets reflected back into the air, and the rest goes into water. The moment light rays enter water, their speed changes and thus, so does their path (except when the light rays hit the surface of water normally). Each optical medium like water, glass, etc. has its own different optical density and due to this, each medium deviates light rays to a specific level. This can be represented by the following diagram:-
Ray diagram showing refraction of a light ray as it travels from air into water.
Define Refraction Consequences in our Daily Life
In our day to day life we come accross many phenomena that are caused due to refraction of light. These are as follows:-
A star appears twinkling in the sky
The sun is visible even before it rises above the horizon at sunrise time.
The sun is seen for some time even after it goes below the horizom at sunset time.
Any piece of paper kept below a thick glass on a table appears to be raised.
The fish visible inside water are deeper than what they seem to be.
A pool of water appears shallower than what it's real depth is.
A pencil, ot a stick kept half immersed in water appears to be bent from the point it is immersed.
by: mathqa
Tea Plantation In Sri Lanka The Origins Of That Famous cuppa! Salary Advance Loan: Finish Simple Applying Method For Salary Advance Find Out How To Compare Cars? Koh Ngai sun Kissed Paradise The Ties What Fresh In This Season Florist Lebanon- Helping To Order Flowers With Ease! Superb Procedures For Amateurs Or Practiced Anglers Understanding The Need Of Installing Good Quality Office Furniture The A To Z Of Uid When You Hire A Moving Company In Ottawa Chiropractor Kansas City Natural Care For Fragile Newbies How Can A School Generate Easy Fundraiser Ideas That Will Work?