Hayes Volcano is a stratovolcano in southwestern Matanuska-Susitna Borough Alaska 135 km northwest of Anchorage that was not discovered until 1975. It is responsible for a series of six major tephra layers in the Cook Inlet region of Alaska. Hayes was mostly destroyed by at least six catastrophic eruptions between 3400 and 3800 years ago and the average volume of these eruptions was 2.4 cubic km. In comparison the volume of the May 18 1980 eruption of Mount St.
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