6.23: Geological Activity and Earthquakes- Challenge 3

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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