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School
Florida International University *
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Course
3202L
Subject
Geology
Date
Dec 6, 2023
Type
docx
Pages
5
Uploaded by DukeBoulder1282
Geologic Events Lab Report
Introduction:
Your task will be to locate the epicenter for the earthquake using the arrival time of P-waves
and S-waves from several seismic stations. Upon completion of the virtual lab, you will write a
laboratory report of your results.
Problem:
How can we use seismic waves to determine the epicenter of an earthquake?
Hypothesis:
They
will help me by helping me find the middle of a earthquake
Materials:
Use the reference image in the
Reading Seismographs
tab of the pre-lab to identify the S-P
Time interval of a seismograph reading. Use the
Determining Distance to an Epicenter
tab
and the
Locating an Epicenter
tab of the pre-lab as practice before completing the
procedures below.
Procedures:
1.
Examine the reference image under
Materials
to learn to identify the S-P time interval
of a seismograph reading.
2.
Under
Data and Observations
, determine the S-P time intervals of all three stations
using the time scale under the seismograph readings. For example, if P wave arrives at
2:02 pm and the S wave arrives at 2:27 pm, the total S-P time interval is 25 minutes.
3.
Record the time interval for each station in
Table 1
under
Data and Observations.
4.
To determine the distance from each seismograph to the epicenter, you multiply the S-P
time interval by 10. For example, if the time interval is 25 minutes, 25 x 10 = 250
kilometers.
5.
Record the calculated distance to each station from the epicenter in
Table 1
under
Data and Observations.
6.
Next, use the distance scale under
Data and Observations
to measure the three
circles provided, each with a radius that equals the distance of each station. To
measure, place the center of each circle at zero. An example measurement is shown
below for a 75 km radius.
7.
Place each of the measured circles around the station on the map that they represent.
All three circles should have one intersecting point that matches the epicenter.
8.
Complete the
Questions and Conclusion
section and
Reflection
Questions
section of
the lab report.
Variables:
For this investigation, list the independent, dependent, and controlled variables.
Data and Observations:
S-P Time Intervals
Table 1: Seismograph Data
Based on your results, were you able to locate the epicenter of this earthquake?
Station
S-P Interval Time (min)
Distance (km)
1
20
200
2
18
180
3
19
190
Distance Scale:
Place each station on the map below to find the epicenter.
Station 1
Station 2
Station 3
Your preview ends here
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Questions and Conclusion
1.
Why are earthquakes monitored worldwide instead of in earthquake-prone areas only?
Because we never know when and where they can occur it can happen anywhere
anytime
2.
How many seismographs are needed to find the epicenter of an earthquake? Why is
this number significant? 3 seismographs[ are needed and its significant to find the
center and the separation
3.
What is the relationship between S- and P-waves? P waves are the primary and S
waves are the secondary waves both cause earthquakes
4.
How did the study of earthquake waves lead to a greater understanding of the interior
structure of Earth?It allowed us to understand earth's layers more and what they do
5.
Not all earthquakes are felt by people; however, such earthquakes are often detected
on seismographs. Why? Because we cant feel small changes that happen like
sometimes if your phone is on vibrate and you can’t feel it
6.
How did your hypotheses about the use of seismographs compare to your experimental
results? Were you able to find the epicenter of the earthquake using this method? They
compare as they should and yes i did find the center
7.
If you were unsuccessful in locating the epicenter, describe how you could modify
seismograph resources to find the epicenter successfully.
i could modify it by asking if
others got the same results and what process they went with to get theres and try it