# Answers earthquake and lab book

The western Washington earthquake measured 6. Follow the steps 1 through 4 to complete the table below refer to and complete Appendix D, reproduced from Geoscience Laboratory, Ch. The more the rubber bands have been stretched from past movement of their free end, the greater the force on the 2x4 block and the greater the chance that the block will slip during the next interval of time.

The body uses chemical energy to cause the muscles to contract, thus stretching the rubber bands. Eventually all of the elastic energy that was given up by the rubber bands is converted to heat energy.

Select answers are provided for you in red font to assist you with your lab work. Shaking for the magnitude 9. Each of these waves travel at different velocities speedseven though they are generated simultaneously by an earthquake at the focus point of origin within the crust.

The San Andreas Fault is an example of a right lateral fault. The seismograph record shows that P-waves first arrived at Typical rates of plate motion are a few cm per year. The first waves to arrive are the P-waves also called "primary" or "push-pull".

One of the curious things about the loss of life in regions surrounding the Bay of Bengal is that some 38, lives were lost in Sri Lanka, whereas only 2 lives were lost in Bangladesh. The type of motion that occurs between two plates is used to classify faults as strike-slip one plate slides past anotherthrust one plate slides under another or normal plates that are pulling apart from each other.

The observer will read out loud the position of the 2x4 at its initial position and then after each movement that the puller makes and the recorder s will write these numbers down.

Click here for a nice page with both scales listed in relation to each other. Write your summary here: Teachers making measurements at an IRIS workshop in To answer this question, you should first contour the map in Figure 9. Seismic Waves Skit Have students act out one of the three types of seismic waves.

If you are given information about how fast P-waves and S-waves each travel, a certain lag time will correspond to a certain distance that may be traveled by earthquake waves.

Require your students to get under their desks and listen quietly to your scenario. Advanced histogram analysis of the data In the study of earthquakes, a histogram of the number of earthquakes within narrow magnitude bands is often used.

Seismic Waves Slinky Demo Click here for one website that discusses how to demo seismic waves. The answer suggests a reasonable method of measuring the elastic constant of the rubber bands.

Using the nomogram, determine the Richter magnitude for the three earthquakes listed see, p. Did both recorders write down the same numbers? Geological Survey said its estimate is for an earthquake at or above a magnitude of 6. The string would not stretch very much, so the block would just move the same amount as the end of the string that is being pulled.

The surface wave seems to be the most damaging. Decide on the magnitude bins for the histogram and for each bin, count the number of events that occurred.

How could this be? However, this lab would not be very interesting if the block moved by creep rather than by stick-slip motion. Because S waves do not travel in a linear motion these are the most destructive. The path that the tsunami would travel to Bangladesh goes through much shallower water than the path to Sri Lanka.

The scrap of paper is helpful when you find where the P and S curves are 5 minutes apart—then you can follow you piece of paper over to the vertical axes distance traveled and see how many kilometers the earthquake station is from the earthquake.

To answer this question, you should first contour the map in Figure 9. Another report released Thursday, by the Association of Bay Area Governments, said hundreds of thousands could be left homeless if a large quake hit.

That's similar to comparing the thickness of an apple's skin to its radius. It has to do with construction materials. You do not need to submit the contour map with this report. You are only able to snap your fingers when the sheer force directing your fingers to move in opposite directions is greater than the compressional force holding your fingers together.Lab: Modeling Movement Along Faults (pg.

) 1a - Students know evidence of plate tectonics is derived from the fit of the continents; the location of earthquakes, volcanoes, and midocean ridges; and the distribution of fossils, rock types, and ancient climatic zones.

Lab 2: Seismic Waves and Travel-Time Curves Name _____ Geophysics of Earthquakes (5) Repeat this experiment 2 more times and record your times.

(6) Next, perform the same experiment, but this time the seismic wave member will run (representing the P-wave). Record these times in.

Students use their reference tables to answer questions regarding earthquake epicenters and time of origin. Plotting Epicenters The data below shows the P- and S-wave arrival time difference determined from seismograms from three different cities, for three different earthquake events.

The Cosmic Calendar Watch this clip from "Cosmos: A Spacetime Odyssey" about the cosmic calendar to learn about how Earth's geoloic timeline fits into the history of the universe. Select answers are provided for you in red font to assist you with your lab work.

Although you are only required to respond to the questions in this worksheet, you are encouraged to answer others from the text on your own.

Answer Key Earthquakes and Volcanoes d, Page 8 1. Choice C is correct. A large break in Earth’s crust is called a fault. Choice A is incorrect because lava is molten rock that has reached Earth’s surface.

Choice B is incorrect because magnitude refers to the strength of an earthquake. answer.