6.23: Geological Activity and Earthquakes- Challenge 3

1. How many seismic stations are needed to find the epicenter of an earthquake, and why?

Three, because this is the minimum number of circles that will intersect at one point.

2. To find the epicenter of an earthquake, ___ seismograms are needed.

three

3. The Richter Scale measures the magnitude of the ___ of an earthquake.

largest jolt of energy

4. An increase of one integer in the moment magnitude scale means ___.

thirty times more energy is released by an earthquake

5. In a ___ scale, each unit is an exponential increase over the previous unit.

logarithmic

6. Small earthquakes that come before large ones are known as ___.

foreshocks

7. Geologists cannot predict earthquakes, because ___.

they can't be sure when and where stress will be released along a fault.

8. Scientists can predict ___.

the region in which an earthquake will occur

9. ___ occurs when an earthquake causes sediments to saturate with water and become quicksand-like in consistency.

Liquefaction