a) Make a table of seismic wave types. For each, explain where it travels, and g
ID: 290255 • Letter: A
Question
a) Make a table of seismic wave types. For each, explain where it travels, and give a simple description of how it moves. Rank the wave types by destructive power. b) Give ranges for velocities of these waves in three different of geological materials, Granite, Basalt, Water. For a given material, does one of thee body wave types usually travel faster than the other? If so, which one? Does it always travel faster than the other? c) Pick 5 cities in North America, Kingston being one, and your home towns also being amont them. Rank the seismic risk, and provide a reference to the source of your information. 1. (20 Marks)Explanation / Answer
1 (a) There are 3 types of seismic waves-
Primary waves- these are the fastest waves. these can travel in solid rocks and fluids like water and liquid layers of earth.They propate through a medium by compressing and expanding the medium and motion of particle is in direction of propagation of wave.
Secondary waves- these are slower than the p wave. these can travel through solid but do no travel in liquid medium.These are the transverse waves and particles moves in direction perpendicular to the wave propagation.
Surface waves - these are the waves travel along the boundary of two substances like solid rock and air.These are slower than the p wave and s waves and too have lower frequency than them Love wave cause horizontal shearing of ground and rayleigh wave travels like ripple on water surface.
Destructivness is proportion to the amplitude , so Surface wave is most destructive followed by S wave then followed by P wave.
(b) Velocity in granite- P wave(4500-6000m/s);S wave(2500-3300m/s)
velocity in basalt-P wave(5000-6000m/s) ;S wave(2800-3400m/s)
velocity in water -P wave(1450-1500m/s) S wave do not travel in water.
For a given material the velocity of P wave is always more than the S wave.
(c)Risk to seismic hazards
Olympia
kingston
Lewiston
Helena
Bismarck
reference to the information-http://time.com/3002710/earthquake/
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.