When a seismometer station records the various seismic waves from an earthquake event, which type of seismic wave arrives FIRST?

The P-waves

The S-waves

The surface (Raleigh and Love) waves

The tidal waves

The lazy waves

Q. When examining the seismic wave signals in earthquakes, which wave(s) do you anticipate will cause the most damage? why?

Which seismic wave below arrives at the seismic recording station last?

a. Surface waves

b. P-waves

c. S-waves

d. Sound waves

e. Tidal waves

Match the following earthquake waves to their properties

1.P wave a. causes side-to-side rather than forward-backward motion as the wave travels through the earth  

2.S wave b. travels fastest and arrives first after an earthquake     

3.Surface wave c. the slowest moving, but often the most damaging of the earthquake waves           

During an earthquake, seismic energy is released and it can travel long distance from source (location of the earthquake) to a seismic station. Path taken by a wave is similar to a ray (line with an arrow) which travels through the earth and arrives at a station. In the last assignment, we look into a case where earthquake is right beneath the station. In this assignment, we are going to investigate a case in which the station is far away from the earthquake, as seen in the diagram below. The ray bends this way because wave speed is generally slower at shallow depth compared to deeper part. Questions 8.1: Why the ray path is bending to be nearly vertical when it approaches the station near the surface? (Hint: think about how horizontal rock layers are stacked on top of each other in terms of wave speed? Which layers have faster wave speed, which ones have slower wave speed? What is the consequence?)

Seismic waves known as s-waves are

As an EHS Manager for Aggie Refining Co, you’ve just been informed of a tragic contractor fatality on the HF alkylation unit of your refinery. What are your internal & external (e.g., OSHA) reporting responsibilities?

The purge stream is an economic loss. Discuss the effects of reducing the purge flow rate on the process. Could the purge be eliminated? If so how? if not why not?

Explain the safety concerns dealing with the use of lamps and power supplies.

A triple-effect forward-feed evaporator is used to concentrate a liquid which has marginal elevation in boiling point. The temperature of the stream to the first effect is 125°C, and the boiling point of the solution within third effect is 45°C. Find out at what temperatures the fluid boils in the Ι and ΙΙ effects. The overall heat transfer coefficients are 2250W/m2 in the Ι-effect, 1800W/m2 in the ΙΙ-effect and 1300W/m2 in the ΙΙΙ-effect respectively.

A solution of HCl is standardized by titration against 0.242 g of primary standard Na2CO3. The titration requires 35.9 mL of HCl. A solid sample weighing 0.152 g and containing sodium oxide is dissolved in water (Na2O + H2O → 2NaOH) and titrated with HCl, requiring 34.7 mL. What is the percentage of Na2O in the sample?

I have certain operating conditions (pressure and temperature) given for a distillation column. Why are these conditions used? If there is a change in the operating conditions, is there an affect on the yield?