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Students examine seismicity related to: (1) a typical fault-generated earthquake sequence, the February, 2008 Wells earthquake, and (2) a typical volcanic-generated earthquake sequence at Mt. St. Helens. For each of these, students describe the distribution of earthquakes on the ground surface and at depth in the earth, and look for characteristics that are unique to each kind of earthquake. They also look for distinctive patterns in the size or depth of the earthquakes with time, again to establish criteria for determining the cause of seismicity. Students then look at seismic records from the "Mogul earthquake swarm" in Spring 2008, and determine whether it looks like it was generated by faulting or by volcanic activity. They conclude with the reason(s) the Mogul earthquake swarm was unusual.
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