1.In Most areas of the continental crust, significant earthquakes occur only wit
ID: 599 • Letter: 1
Question
1.In Most areas of the continental crust, significant earthquakes occur only within the upper 15 to 20 kilometers. This is best explained by?
a. below 15 to 20km the crust is warm in enough to deform by plastic flow instead of sliding on faults
b. the pressure is too low below 15 to 20 km to produce earthquakes
c. the pressure is too great below 15 to 20 km to prduce earthquakes
d. below 15 to 20 km everthying is molten.
e. the magma sources for volcanoes only occur within the upper 15 to 20 km of the crust
f. none of the above.
2. You hear that studies have found a new fault hidden beneath downtown clovis and that it is likely to produce a M7.7 earthquake within the next ten years. This story is most likely to be accurate if ?
a. It aired on channel 36 with an interview of a UC berkely seismology professor
b. THERE IS A FEATURE ON WIKIPEDIA ABOUT THIS FAULT.
c. it is published in the la times with a quotations from a us geological survey seismologist
d. it was published in a peer reviewed scientific journal
e. it was posted on the website of a fresno state geology proffessor.
Explanation / Answer
1)
considering that pressure and temperature both increase with depth in the Earth, geologists finds that in typical continental crust, rocks behave brittlely above about 10-15 km, whereas they behave ductilely below. Earthquakes in continental crust happen only above this depth because these earthquakes involve brittle breaking.
ANS:A
2)ANSWER IS OBVIOUSLY D,AS IT IS THE PROPER SCIENTIFIC WAY OF APPROVING,FINDING OR APPOACHING ON SUCH DISCOVERIES OR ANY INVENTIONS.
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