Describe the steps you would go through to determine the source of an earthquake, provided you had access to three seismographs that recorded the event
What will be an ideal response?
Answer: First I would measure the amount of time that elapsed between the arrival of the first P wave and the arrival of the first S wave on seismogram #1. Then I would use the chart showing P and S wave travel times versus distance to determine the distance from seismogram #1 to the epicenter. Then I would repeat that with seismograms #2 and 3. Finally, I would triangulate the distances, using three circles of different radii, and the point where all three circles intersect would be the epicenter.
You might also like to view...
We define the direction of an electric field to be the direction of force on
A. a negatively charged particle. B. any charged particle. C. a positively charged particle. D. none of the above
The area surrounding a service from which customers are attracted is the threshold or the rank-size
Indicate whether the statement is true or false.
Which option best describes the direction of the eruption of Mount St. Helens and the cause of this action, according to Figure 15.24 in your textbook?
A) Magma pressure built up and caused a vertical eruption of magma and ash. B) A rock slide released pressure on the magma, causing a horizontal eruption. C) An earthquake sheared off part of the mountain, causing a horizontal eruption. D) An earthquake opened a vent in the top of the mountain, releasing pressure on the magma and causing a vertical eruption.
We could, in theory, make all of our industrial processes sustainable if we could ________
A) transform cyclic processes into linear ones B) speed up the disposal of wastes by deep-well injection C) develop more draconian policies to regulate manufacturing D) transform linear processes into circular ones E) reduce the use of biodegradable plastics