Quiz: Earthquakes, Seismology, and Mapping Answer Key

Record your answer from ch. 6 Lab Exercise #1, Step 2, Question 1. What is the distance in kilometers between the seismic station and the epicenter?

(I got this wrong) It is either 2400km or 3000km

The light blue formation's symbol is Pk? What does the first letter "P" represent? (Question is based on the Geologic Map of the Grand Canyon found in Module 6 Learn).

Permian

What geologic feature is represented by a pink colored line with small perpendicular arrows pointing away from the line? (Question is based on Ch. 6, Figure 6.23 or graphic below).

anticline

To locate the epicenter of an earthquake, it takes

at least three seismic stations.

What geographic feature is represented by a tight grouping of contour lines? (Question is based on the topographic map of Grand Canyon National Park and Vicinity, Ariz. found in the lab kit).

cliff

What is the general location of this map area in the state of Arizona? (Question is based on the topographic map of Grand Canyon National Park and Vicinity, Ariz. found in the lab kit).

north central Arizona

The epicenter of an earthquake is a point

on the earth's surface directly above the initial release of seismic energy.

What type of feature is represented by a scarcity of contour lines? (Question is based on the topographic map of Grand Canyon National Park and Vicinity, Ariz. found in the lab kit).

plateau

What are the two main geographic features in the map area? (Question is based on the topographic map of Grand Canyon National Park and Vicinity, Ariz. found in the lab kit).

plateaus and canyons

What geologic feature is represented by a pink colored line with small perpendicular arrows pointing inward toward the line? (Question is based on Ch. 6, Figure 6.23 or graphic below).

syncline

Determining the distance along the earth's surface from a seismic station to the epicenter of an earthquake is based on the difference in arrival times between

the first P wave and the first S wave.

According to the Prospect Hill contour map in Figure 6.20, the land surface could be

two hills with a lower area between them.

What is the approximate relief (the difference between the highest and lowest elevations) along the A-A' cross section? (Question is based on portion of the Geologic Map of the Grand Canyon found below).

~3,000 ft

Record your answer from ch. 6 Lab Exercise #1, Step 1, Question 3. What is the time lag (S-P) inhours:minutes:seconds?

00:04:10

Record your answer from ch. 6 Lab Exercise #1, Step 1, Question 1. What time in hours:minutes:seconds GMT did the P waves arrive?

01:49:00

Record your answer from ch. 6 Lab Exercise #1, Step 1, Question 2. What time in hours:minutes:seconds GMT did the S waves arrive?

01:53:10

For this map scale: 1 inch equals approximately how many miles? (Question is based on the topographic map of Grand Canyon National Park and Vicinity, Ariz. found in the lab kit).

1

A mile on the ground would be what distance (in inches) on a 1:50,000 scale topographic map? (Refer to information found in the Scale Conversion section of this lesson. Round your answers to the nearest hundredth decimal place)

1.26 inches

On a 1:125,000-scale map, one inch represents what distance on the ground?(For questions 4 and 5, you will want to refer to information found in the Scale Conversion section of this lesson. Round your answers to the nearest hundredth decimal place)

1.97 miles

Record your answer from ch. 6 Lab Exercise #2, Step 4. What is the distance between the Los Angeles seismic station and the earthquake's epicenter?

1300km

In Figure 6.20, what is the elevation of the mine (locate the mining symbol) on Prospect Hill? (Based on Ch. 6 Lab Exercise #3: Contour Exercises)

140 ft

What is the approximate relief (highest point - lowest point) of the Campbell Hill topographic profile?Question is based on Lab Exercise #4: Topographic Profiles. (p. 141)

150

Record your answer from ch. 6 Lab Exercise #2, Step 5. What is the time lag for noted at the Austin, Texas, seismic station?

165 seconds

What is the map scale? (Question is based on the topographic map of Grand Canyon National Park and Vicinity, Ariz. found in the lab kit).

1:62,500

Record your answer from ch. 6 Lab Exercise #2, Step 1. What is the time lag for noted at the Seattle,Washington, seismic station?

65 seconds

What is the contour interval of this map? (Question is based on the topographic map of Grand Canyon National Park and Vicinity, Ariz. found in the lab kit).

80 ft

What is the name of the river at the bottom of the canyon? (Question is based on the topographic map of Grand Canyon National Park and Vicinity, Ariz. found in the lab kit).

Colorado River

Record your answer from ch. 6 Lab Exercise #2, Step 12. What city is nearest to the epicenter?

Helena

Record your answer from ch. 6 Lab Exercise #2, Step 3. What is the time lag for noted at the Los Angeles, California, seismic station?

It is either 100 or 120 seconds

Record your answer from ch. 6 Lab Exercise #2, Step 6. What is the distance between the Austin seismic station and the earthquake's epicenter?

It is either 1950km or 2200km

Record your answer from ch. 6 Lab Exercise #2, Step 2. What is the distance between the Seattle seismic station and the earthquake's epicenter?

It is either 700km or 900km

Which of the following statements is correct?

It is either... P-wave amplitude and S-wave amplitude are about the same. or... P-wave amplitude is larger than all the other seismic waves recorded on a seismogram.

The focus of an earthquake is a point

It is one of the answers that start with "within"

Which of the following seismic waves is the last to arrive at a seismic station?

Love wave

In which part of the map is the river highest in elevation? (Question is based on the topographic map of Grand Canyon National Park and Vicinity, Ariz. found in the lab kit).

NE

The following seismic waves are used to locate earthquake epicenters:

P and S waves

Which of the following seismic waves has the same wave form as a sound wave?

P wave

Which of the following seismic waves is the first to arrive at a seismic station?

P wave

The two kinds of body waves are

P waves and S waves

Which seismic wave vibrates side-to-side relative to its direction of travel?

S wave

Of the three rock types, which type dominates the map area? (Question is based on the Geologic Map of the Grand Canyon found in Module 6 Learn).

Sedimentary

There are numerous strike and dip symbols and on the Grand Canyon map. What is the best interpretation of this symbol?

The beds are slightly tilted to the SW

Assume you are hiking from the rim of the Grand Canyon to the Colorado River at the bottom. As you encounter the rock layers along the trail, what can generally be assumed to be true of the relative rock ages?

The rocks are getting older

What is the longitude of the east side of the map? (Question is based on the topographic map of Grand Canyon National Park and Vicinity, Ariz. found in the lab kit).

either 111 45' or 112 45'

What is the magnetic declination of the topographic quadrangle map? (Question is based on the topographic map of Grand Canyon National Park and Vicinity, Ariz. found in the lab kit).

either 15 east or 20 west

What is the latitude of the bottom right of the map? (Question is based on the topographic map of Grand Canyon National Park and Vicinity, Ariz. found in the lab kit).

either 36 00' or 36 28'

What is the latitude of the top of the map? (Question is based on the topographic map of Grand Canyon National Park and Vicinity, Ariz. found in the lab kit).

either 36 00' or 36 28'

If you were standing on the north rim facing Grand Canyon, which direction would the sun be setting? (Question is based on the topographic map of Grand Canyon National Park and Vicinity, Ariz. found in the lab kit).

either to your right or to your left

From this section of the Grand Canyon Map, match 3 the following rock formations with the description of their relative age.

idk, I did... 1) The Qa strata is the youngest 2) The Pk strata is older than Qa and younger than Pt 3) The Pt strata is the oldest and I only got one right, then I flipped the top and bottom one and got none right lol

What answer below best represents the profile in Figure 6.21A between point A and point A'?

it is either B or D (probably B)

Locate the Powell Plateau in the northeast section of the map. Based on the surrounding topography, what is one reason there are no roads here? (Question is based on the topographic map of Grand Canyon National Park and Vicinity, Ariz. found in the lab kit).

it is surrounded by cliff faces

say you looked up "Geology map of ...(where you live)"

mine was Granite cuz I live in NC