Answers to the Finding the Epicenter Gizmos Lab PDF

Preview

Summary

Your welcome :) sooo i hope you pass and get a 100 on your work bye have a great day!!!!! I am uploading this because I feel bad for you. All of this is right btw I got a 100....

Description

Name:

Earthquakes 2 – Determination of Epicenter [NOTE TO TEACHERS AND STUDENTS: This exercise assumes that you have a data table and graph made while using the Earthquakes 1 – Recording Center Gizmo. If you do not have those, or have never used that Gizmo before, do that first.] Define Vocabulary: 1. body wave– a seismic wave that travels through Earth’s interior. 2. earthquake – shaking and vibration of Earth’s surface. 3. epicenter – the point on Earth’s surface directly above the focus, or origin, of an earthquake. 4. fault – a fracture in Earth’s crust where the rocks on either side have moved. 5. focus – the point within Earth where an earthquake originates. Also known as the hypocenter. 6. P wave – one of two types of body waves that are produced by earthquakes. 7. S wave– one of two types of body waves that are produced by earthquakes. 8. seismic wave – a vibration produced by an earthquake. 9. seismogram– a graphical record of ground vibrations. Seismograms are made by instruments called seismographs. 10. seismograph – an instrument that measures and records ground vibrations.

Prior Knowledge Questions (Do these BEFORE using the Gizmo.) Three dogs meet in a park. Each dog is attached by a leash to its owner (triangles). 1. What does each colored circle represent: each one represents in 360 degrees the farthest distance the dog(s) can go from it’s owner

2. Where could all the dogs meet in one place? State this: They can meet at the epicenter

3. Is there another spot where all three dogs could meet: Explain:The green dong and blue dog can meet and there is another place thatv the purple and the blue dog can meet there is only on spot that all three of the dogs can meet.

Gizmo Warm-up When you used the Earthquakes 1 – Recording Station Gizmo, you learned how to find the distance from a recording station to the epicenter. With the Earthquakes 2 – Determination of Epicenter Gizmo, you will use data from three recording stations to find the exact location of the epicenter. Click Play ( ), and then click Pause ( ) when the seismograms are complete. Compare the three seismograms. 1. Which recording station is closest to the epicenter: the closet is c How do you know:station c picked up c frist and it’s the same p wave for all of them.

2. Which recording station is farthest from the epicenter: it’s station b How do you know:It’s b because of the distance until the p wave is registered

Get the Gizmo ready:

Activity:

● Click Reset ( ). ● Click Play, and then click Pause when the seismograms are complete.

Locating the epicenter

Goal: Based on three seismograms, locate the epicenter of an earthquake. 1. Prepare: To complete this activity, you will need the table and graph you made in the Earthquakes 1 – Recording Station Student Exploration. OPEN UP THE GOOGLE SHEETS NOW.

2. Measure: Turn on Show time probe. On each seismogram, locate the first P-wave and the first S-wave. Measure the time interval (∆t) for each seismogram, and then use your graph to find the distance of each station to the epicenter. Station

Time interval (∆t)

Distance to epicenter (km)

A

65 secounds

490

B

80 secounds

600

C

23

110

3. Locate: Turn on the Show station A checkbox. Set the Radius to the distance of station A from the epicenter, based on your table above. Look on the circle on the map. Where could the epicenter be located:anywhere along the purple line

4. Locate: Turn on the Show station B checkbox. Set the Radius to the distance of station B from the epicenter. Look on the two circles on the map. Which two places could the epicenter be located now:ethnier the top of the graph I can’t see it cause it goes out of the page

5. Locate: Turn on the Show station C checkbox. Set the Radius to the distance of station C from the epicenter. If you did everything right, you should see the epicenter symbol ( ). If you do not, recheck all of your distances. (You may need to adjust each radius slightly.) Relative to the three circles, where is the epicenter located: the epicenter s very close to station c

6. Practice: Click Reset. Try to locate at least five more epicenters. Each time you locate an epicenter, click the Tools palette and click Screen shot. Right-click the image, choose “Copy Image,” and paste the image into current document....