Belknap

Photo of this volcano
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 44.285°N
  • 121.841°W

  • 2095 m
    6872 ft

  • 322060
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for Belknap.

The Global Volcanism Program has no Weekly Reports available for Belknap.

The Global Volcanism Program has no Bulletin Reports available for Belknap.

Eruptive History


Summary of Holocene eruption dates and Volcanic Explosivity Indices (VEI).


Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
0480 (?) Unknown Confirmed 2 Radiocarbon (corrected) Belknap Crater
0800 BCE ± 300 years Unknown Confirmed 2 Radiocarbon (corrected) South Belknap and Twin Craters
1030 BCE ± 300 years Unknown Confirmed 0 Radiocarbon (corrected) Little Belknap

This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.

Photo Gallery


The broad Belknap shield volcano at the left, viewed from Sand Mountain volcano to its NW, with the Three Sisters volcanoes in the background, is one of the youngest volcanoes in the central Oregon Cascades. The latest dated lava flow from Belknap volcano traveled 15 km west to the McKenzie River, beyond the right margin of this photo, from a vent on the NE side of Belknap about 1500 years ago.

Photo by Lee Siebert, 1981 (Smithsonian Institution).
See title for photo information.
Little Belknap shield volcano, seen here from the side of Belknap volcano on the west with Black Crater in the background, was formed about 2900 years ago. Lava flows from Little Belknap, buttressed against the higher Belknap volcano on the west, spread primarily to the east.

Photo by Lee Siebert, 1982 (Smithsonian Institution).
See title for photo information.
The McKenzie Pass area in the central Oregon Cascades contains one of the largest concentrations of youthful volcanism in the United States. Belknap shield volcano, seen here from Black Crater to the SE, is capped by a snow-covered pyroclastic cone. Lava flows from Belknap and the smaller Little Belknap shield volcano in front of it cover nearly 100 sq km. Most of the largely unvegetated flows were erupted between about 2900 and 1500 years ago.

Photo by Lee Siebert, 1995 (Smithsonian Institution).
See title for photo information.
Little Belknap (upper left) is an example of a small shield volcano in a continental margin setting. Little Belknap was constructed on the east flank of Belknap volcano and spread fresh-looking lava flows over the McKenzie Pass area of the central Oregon Cascades about 2900 years ago. Collapsed lava tubes that fed the flows diverge radially away from the summit. The summit pinnacle of Mount Washington appears at the right beyond the Little Belknap lava apron.

Photo by Lee Siebert, 1995 (Smithsonian Institution).
See title for photo information.
Lava flows from Little Belknap shield volcano in the central Cascade Range of Oregon on the right skyline diverge around a "kipuka," a forested island of pre-eruption terrain in the center of the photo. "Kipuka" is a Hawaiian term for older land surrounded by lava flows. In some cases the surface of the kipuka may be lower than the adjacent lava.

Photo by Lee Siebert, 1995 (Smithsonian Institution).
See title for photo information.
The young lava flow in the foreground, with snow-capped Mount Jefferson in the background, was erupted about 2600-2900 years ago from Yapoah cinder cone on the north flank of North Sister volcano. Lava flows in the middle of the photo originated from Little Belknap shield volcano, part of one of the largest concentrations of youthful volcanism in the continental United States: the McKenzie Pass area of the central Oregon Cascade Range.

Photo by Lee Siebert, 1995 (Smithsonian Institution).
See title for photo information.
Lava flows in the foreground originated about 1505 years ago from the breached South Belknap cinder cone below the skyline at the left center. South Belknap cinder cone lies below Belknap Crater, a pyroclastic cone capping the Belknap shield volcano. The low peak on the right skyline is Little Belknap, a small shield volcano constructed on the east flank of the Belknap shield volcano. Largely unvegetated lava flows cover nearly 100 sq km in the McKenzie Pass area.

Photo by Lee Siebert, 1995 (Smithsonian Institution).
See title for photo information.
The South Belknap cinder cone on the middle left skyline was constructed on the SW flank of Belknap shield volcano (upper right) about 2600 years ago during an eruption that produced lava flows that traveled to the south. The foreground lava flows originated from Belknap volcano.

Photo by Lee Siebert, 1995 (Smithsonian Institution).
See title for photo information.

Smithsonian Sample Collections Database


The following 1 samples associated with this volcano can be found in the Smithsonian's NMNH Department of Mineral Sciences collections. Catalog number links will open a window with more information.

Catalog Number Sample Description
NMNH 112584-28 Basalt

Affiliated Sites