2.16 MOD Unit 2 Test

Last updated about 1 month ago

12 Nsɛmmisa

You are vacationing in Tokyo, Japan when you feel the ground begin to move. At first you think you are imagining it, then it gets stronger, you can see the buildings swaying and people running. Its been 30 seconds and the eathquake is still raging. You start to notice the ground rolling beneth you and run into a clearing, far from buildings and large trees. You watch as debri falls and the ground forms small cracks and try to keep your balance. The roads begin to buckle and some buildings crumble, until finally the movement stops and silence falls. You gaze upon the damage, stunned by what just happened.

2.16 MOD Unit 2 Test

Last updated about 1 month ago

12 Nsɛmmisa

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Looking at this map of world wide earthquakes and volcanoes, what do you notice? What do the lines of volcanoes and Earthquakes map out?

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Now that the earthquake has stopped, questions start running through your head. What happend, why and how. Where did this earthquake come from? Not long after the quake, the local news station releases seismograph data from locations around Japan.

What is a Seismograph?

An instrument that measures the force and duration of an earthquake.

An instrument that measures air pressure.

An instrument that records the epicenter of an earthquake.

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You have seismograph data from three locations, use the seismograph information below to find your time intervals for each location.

Click on each graph to make it bigger.

Location #1 Pusan, South Korea

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Location #2 Tokyo, Japan

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Location #3 Akita, Japan

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Fill in the blanks below with the time interval for each location. (The time interval is provided on the seismograph data, click on each image to enlarge)

(answer with number +s, i.e. 36 s)

Location Time Between Waves (s)

Pusan, South Korea

Tokyo, Japan

Akita, Japan

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Now that you have the times for each location, use the chart provided to convert the time between the P-Wave and S-wave into distance.

This can be done becuse the waves move through the earth at different rates, and the further away from the epicenter you are the larger the time difference between the waves.

Click on this graph to make it bigger:

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Use the graph to the left (Click on it to enlarge) to find your time converted to distance.

Find your time on the Y axis, follow it horizontaly until you reach the diaginal line, then follow it straight down to the distance.

For example, if our time between the P-Wave and S-Wave was 36 seconds, our distance from the epicenter would be 320 KM.

(This is the same process we used in the Earthquake Epicenter assignment).

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Type your distances into the correct space.

(Answer with distance + km, i.e 320 km)

Location Distance (km)

Pusan, South Korea

Tokyo, Japan

Akita, Japan

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The distances you have found are from the epicenter to the seismograph location, or the radius of the circle around each city. In order to map your data, you need the diameter of the circle around each city.

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Multiply each distance by 2 to get the diameter.

Radius X 2 = Diameter

(Answer with number + km, i.e 640 km)

Location Circle Diameter (km)

Pusan, South Korea

Tokyo, Japan

Akita, Japan

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You are so close to finding out where this earthquake originated from. Now you need to map out your data to triangulate the epicetner location.

Look for a point where all 3 circles overlap, this is your epicenter. Use the scribble tool and pick a color to mark your epicenter.

Scribble Tool:

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(This is the same process we used in 2.13 Earthquake Epicenter Activity)

Your data is mapped below, look for where the three cricles intersect (overlap), and mark your epicenter location.

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You now know where the earthquake came from, but why did it happen? What caused the earth to move so violently?

Take a look at this map of Plate Boundaries in the Japan Region and answer the following questions. Click on the image to enlarge.

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Draggable item		Corresponding Item
Convergent Collision		Plates moving away from each other, forming a spreading center ridge.
Transform		Subduction where one plate slides under the other, forming a trench and volcanic mountain ranges.
Convergent Subduction		Collision where the plates smash into each other and rise up into a mountain range.
Divergent		Two plates sliding against each other, either horizontaly or vertically, forming large fault lines.

Draggable item		Corresponding Item
Convergent Collision		Plates moving away from each other, forming a spreading center ridge.
Transform		Subduction where one plate slides under the other, forming a trench and volcanic mountain ranges.
Convergent Subduction		Collision where the plates smash into each other and rise up into a mountain range.
Divergent		Two plates sliding against each other, either horizontaly or vertically, forming large fault lines.

2.16 MOD Unit 2 Test

2.16 MOD Unit 2 Test

Looking at this map of world wide earthquakes and volcanoes, what do you notice? What do the lines of volcanoes and Earthquakes map out?

What is a Seismograph?

Your data is mapped below, look for where the three cricles intersect (overlap), and mark your epicenter location.

Looking at this map of world wide earthquakes and volcanoes, what do you notice? What do the lines of volcanoes and Earthquakes map out?

In the diagram of the Earth's Interior, which part drives the movement of the plates?

What process occurs within the Earth that causes the plates to move?

What is a Seismograph?

Your data is mapped below, look for where the three cricles intersect (overlap), and mark your epicenter location.

Look at the map. What 2 plates are interacting at the location of the epicenter?

Use the Key on the map to identify the type of plate boundary the epicenter is on.

What type of movement is happening on this boundary?

Match the type of boundary with the correct plate movement.

In the diagram of the Earth's Interior, which part drives the movement of the plates?

What process occurs within the Earth that causes the plates to move?

Look at the map. What 2 plates are interacting at the location of the epicenter?

Use the Key on the map to identify the type of plate boundary the epicenter is on.

What type of movement is happening on this boundary?

Match the type of boundary with the correct plate movement.