Link to USGS home page.
Contact USGS

Facebook Icon Twitter Icon
  • Assess
  • Prepare
  • Forecast
  • |
  • Activity
  • Products
  • Observatories
  • About

Santa Clara Volcanic Field

 Santa Clara Volcanic Field
Santa Clara Volcanic Field Image

Quick Facts

Located in southwestern Utah, the Santa Clara volcanic field is part of a belt of Pleistocene-Holocene volcanic fields extending from the northern Grand Canyon in Arizona to central Utah near Fillmore. The volcanic field covers about 1600 km2 (620 mi2) and consists of more than 50 cinder cones and several lava domes. The Santa Clara volcanic field has been active since around 2.5 Ma, with the bulk of the activity younger than 1 million years old. Although it's been active since 2.5 Ma, the Santa Clara volcanic field erupted as three main episodes: 1.1 – 0.95 Ma, 0.7 – 0.55 Ma, and 0.35 – 0.25 Ma. Sporadic eruptions are also recorded at 2.3 Ma, 2.0 Ma, and 1.5 Ma. Most of the eruptions were basaltic or andesitic, although a pulse of more silica-rich dacite occurred at both 2 and 1 Ma. The youngest eruptions occurred about 32,000 years ago northwest of St. George, Utah near Snow Canyon State Park. These basalt eruptions formed the Santa Clara and Diamond Valley cinder cones and lava flows, which travelled south through lava tubes. Many of the vents are aligned with regional faults associated with the host Basin and Range Province, although not all of the eruptions occurred along exposed fault traces.
Location: Utah, Washington County
Latitude: 37.257° N
Longitude: 113.625° W
Elevation: 1,465 (m) 4,806 (f)
Volcano type: volcanic field
Composition: basalt
Nearby towns: St. George