# short earthquake HW

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Hi I need help with my HW it talks about earthquake Evry thing you need to know is inn the file Thank you

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Earthquake exercise
This assignment will require you to download an app to your phone (Android or iPhone). Any seismometer app will do (most are
free; I suggest using a free one), but it must show X, Y, and Z axes. Examples: iSeismometer, Seismometer 6, Seismograph (Androidspecific). Type your answers into this document and submit to Canvas as a .docx file.
This assignment requires you to make some noise. Please be considerate, and do this at a reasonable hour.
1)
2)
3)
4)
Place your phone on a tabletop. Open the app and run the seismometer. Drop a hardcover book/textbook one foot from
the phone. Pause the seismometer. Mark in the table which one had the largest, medium, and smallest amplitude of waves.
Keep your phone in the same place. Drop a pencil one foot away from your phone. Mark the general size of the waves in
the table. How large were the waves? Mark your observations in the appropriate column.
Now drop the same pencil 3ft away. Record observations-how did they change from 1ft away?
Keep your phone in the same place. Shove the table. Record the wave observations in the same way. What has changed
from the first two observations? Mark this in “observations”. Be specific.
X
Y
Z
Observations
Tabletop
Book
Pencil- 1 ft
Pencil- 3 ft
Push table
Jump next to
table
5)
6)
7)
8)
Place your phone on the floor: please indicate here if it was: hardwood, tile, or carpet:___________________
Drop the same book you used in the first part one foot away. Record your observations of wave size and observations.
Drop the same pencil from part one from one foot away. Record observations
Drop the same pencil from three feet away. Record observations. Which had higher amplitude, 1 or 3 feet?
Jump next to your phone (remember- don’t move your phone). Record observations. When recording, make sure to
X
Y
Z
Observations
Floor
Book
Pencil-1 foot
Pencil-3 feet
Jump!
9)
Go outside! Place your phone on the ground (not a sidewalk or driveway-on dirt/grass/etc). Drop the same book from one
foot away. Record observations.
10) Drop the same pencil from one foot away. Record observations
11) Drop the same pencil from three feet away. Record observations
12) Jump next to your phone. Record observations.
X
Y
Z
Observations
Ground (not
concrete)
Book
Pencil-1 foot
Pencil-3 feet
Jump!
13) Assume all of the experiments represent real earthquake motions. How did the amplitude of the waves differ when you
dropped your pencil at 1 and at 3 feet away (on any surface)? Relate this to the Mercalli intensity- where would the higher
Mercalli intensity have occurred and why? If this were a real life situation, where would the greatest societal impact have been?
14) Which material had the highest amplitude at the furthest distance away?
15) Between the grass and the floor, which material had the higher amplitude at the furthest distance away? What might that
mean in terms of the surface’s ability to transmit seismic waves?
16) Read this short article on Hurricane Irma (https://www.usatoday.com/story/weather/2017/09/05/hurricane-irma-so-strong-itsregistering-devices-designed-detect-earthquakes/634419001/). What did Hurricane Irma do to seismometers? How is the
seismometer in your phone different from one that is used to detect earthquakes by geological surveys? Is it as accurate?
18) What are the two plates involved?
19) What type of plate boundary is this? Which plate is being subducted?
20) Without knowing any more information, why is this plate being subducted? Think of the type of crust/density.

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