| Hayes Volcano | |
|---|---|
 Hayes Volcano, 1981 | |
| Highest point | |
| Elevation | 9,147 ft (2,788 m)[1] |
| Listing | List of volcanoes in the United States |
| Coordinates | 61°38′25″N 152°24′41″W / 61.64028°N 152.41139°W[2] |
| Geography | |
  Hayes Volcano Location in Alaska | |
| Location | Matanuska-Susitna Borough, Alaska |
| Parent range | Tordrillo Mountains |
| Topo map | USGS Tyonek C-7 |
| Geology | |
| Mountain type | Stratovolcano |
| Volcanic arc/belt | Aleutian Arc |
| Last eruption | 1200 ± 300 years |
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 3,400 and 3,800 years ago, and the average volume of these eruptions was 2.4 cubic km.[1] In comparison, the volume of the May 18, 1980 eruption of Mount St. Helens was about 1 cubic km. The eruptions of Hayes Volcano during that time were the most voluminous Holocene eruptions to have occurred in the Cook Inlet region. There is currently no fumarolic activity present. The last eruption of Hayes Volcano occurred roughly 1,200 years ago.[2] It is named after the adjacent Hayes Glacier.
- ^ a b "Hayes". Alaska Volcano Observatory. Retrieved 2005-10-24.
- ^ a b "Hayes". Global Volcanism Program. Smithsonian Institution. Retrieved 2005-10-24.