EXAM #4-GEOL 1403

An earthquake occurs with an epicenter in the town of Odessa, TX, in the interior of the North American Plate. Where might the hypocenter of this earthquake plausibly be found?

• 10 km north of Odessa

• 10 km south of Odessa

• 20 km beneath Odessa

• 200 km beneath Odessa

Strike-slip faults ________.

• have primarily horizontal movement

• have primarily vertical movement

• have no appreciable displacement

• are low angle reverse faults

Which layer produces the earth's magnetic field?

• Crust

• Inner core

• Mantle

• Outer core

• All of the above

Earthquakes only occur ____________ the brittle/ductile transition depth.

• Above

• at or near

• below

A hot body of rock is more likely to exhibit ____________ than is a cold body of rock.

• brittle behavior

• ductile behavior

• both, about equally

• neither

Earthquakes are produced during:

• plastic failure within the mantle

• brittle failure during faulting

• plastic deformation during folding

• none of the above

On what type of plate boundary would you expect mostly light to minor earthquakes?

• convergent

• divergent

• transform

The mantle consists mainly of _____________.

• granitic rocks

• basaltic rocks

• ultramafic rocks

• gabbroic rocks

Which type of fault does NOT, by definition, have a fault trace?

• normal fault

• reverse fault

• blind fault

• all faults have recognizable traces by definition

Which layer of the earth's interior has the highest density?

• Continental crust

• Inner core

• Mantle

• Oceanic crust

• Outer core