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GEOLOGY 100 – PHYSICAL GEOLOGY

PART A. MINERAL AND ROCK MATERIALS USED TO BUILD A HOUSE (10%)

Refer to Chap. 4 (Se

c.

4.15, pages 102

-10

3) in your textbook to complete this section of the midterm assignment. The student should review and use Chapters 4, 5, 7, and 8 from the textbook, and may also use outside or online sources. Sources must be listed in proper APA-style citations, including the textbook. Below is a matrix that may be used for your answers, and you will need to add more lines to the columns. Another form may be substituted (Excel, or a graphic software). Make sure Parts A and B are submitted as a single document in your Assignment folder.

House Parts

(Roof, walls, foundation, countertops, etc.)

Mineral or Rock Used

Useful Mineral or Rock Properties for this construction project

Geologic Origin of Mineral or Rock Used

Characteristics of Rock or Mineral Used

How Mineral or Rock Product Used was Processed

PART B. SEISMIC PROFILE AND TECTONIC PLATE BOUNDARY EXERCISE (10%)

Purpose: Apply the scientific method to interpret geologic data/information in this exercise. The student should review and use Chapters 3, 6, and 12 from the textbook, and may use outside or online sources. Sources must be listed in proper APA-style citations, including the textbook.

EXERCISE:

Earthquake data has been collected over a 32 month period from a local seismograph network. A total of 2476 events were recorded, of which, 205 are chosen to serve as the master data set (earthquakes with the most reliable locations).

The master data set is provided in Table 1, which shows only the earthquake foci locations that occur within the line of the cross section in Figure 1 at latitude 20ºS. The focus (pl. foci) of an earthquake is the point of the earthquake source below the surface, while the epicenter is the point directly above the focus and located at the surface.

Plot the earthquake data from Table 1 on the cross-section of Figure 1 by placing a dot on the cross-section at the correct location for each earthquake focus.

Longitude, ºW

Depth (km)

Longitude, ºW

Depth (km)

68

65

-15

67

68

-20

67

72

66

66

68

-23

69

-20

72

-12

71

67

-25

65

70

71

-9

64

70

69

-17

Longitude, ºW

Depth (km)

68

-18

66

-24

69

-15

65

-29

-28

-25

71

67

-21

73

-8

-20

63

-33

70

-12

72

-6

-23

-9

-26

-22

-10

64

-30

-27

-14

-32

-17

Table 1. Earthquake foci data recorded along the plane of the cross section of Figure 1.

Figure 1. Cross-section along a line of latitude of 20ºS.

Interpret the data by answering the following questions:

1.
Based on the pattern that emerged when you plotted the earthquake foci data, determine the plate tectonic boundary type for this region. Indicate this by drawing a possible plate boundary on the cross-section, and show the direction of motion of the plates with arrows.

2.
Describe the geologic processes and activity associated with this type of tectonic boundary.

3. Assess this region for geologic hazards. Name three natural hazards that could be expected in this region.

a.

b.

c.

4. Based on the latitude and longitude from Figure 1, where is this plate boundary located?

Updated 02.02.2013

-3

3km

-30km

-27km

-24km

-21km

-18km

-15km

-12km

-9km

-6km

-3km

Earth’s surface

Sea Level

65ºW

60ºW

3km

75ºW

70ºW

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