Predicting Volcanic Eruptions Organizer Answers

Page 2:

Describe two changes that occurred on the surface of the dome as the magma moved upward?
	1.___movement of thrust fault increased___________________________

	2.____tilt increased______________________________________________

Page 3:

In the weeks and days before the eruptions, what happened to the distance between the metal stakes?
________the distance between the stakes grew shorter as thrust faults moved_______

_________the stakes moved more quickly___________________________________

How did the observations described in the previous question affect the scientists’ predictions?
 _____this indicated to scientists that there was a pattern to which actions occurred before an eruption______

Page 4:

What happened to the crater floor just before eruption? _______the angle of the ground 

changed.  The crater floor tilted outward away from the dome.___________

Page 5:

Describe one method scientists use to analyze earthquake data. 
______one way to analyze the data is to plot the number of earthquakes that occur beneath a volcano every day__________________

What happens to earthquakes before an eruption? _____the number of earthquakes_

____increases right before an eruption, but not the size of the earthquakes_________