The following four Quicktime movies were taken in 2006 and 2007 by D. Tucker at fumaroles near the West Rim of Sherman Crater. The crater has dozens, if not hundreds, of gas vents, mostly a few centimeters across, that emit water vapor, carbon dioxide, hydrogen sulphide, and other gases. Gas temperature is right around boiling at 9700 feet elevation- about 91 degrees C. Fumarole chemical compositions are posted in the geochemistry section. The latest sampling of these fumaroles was done in July 2007; (see photo above). Sherman crater fumaroles, their chemistry and implications for Mount Baker activity are discussed in Werner and others, 2009.
[Click image for movie; no audio] Overview of Sherman Crater from the west rim in 2006. This is an overview into Sherman Crater looking east, along the climbers’ route up the Easton Glacier Route. The view begins with Peter Scherrer sitting on the pale colored, hydrothermally altered YP tephra covering the rim, then pans east to a view of the West Main fumarole in an ice pit 100 feet below us; this is one of the largest fumaroles in the crater, and very noisy. Steam from this fumarole drifts across the field of view. The view then looks across the glacier on the southern-most slopes of the crater to the sharp point of Sherman Peak. The camera pans across the East Breach, the lowest point on the crater rim (9550 feet) to Lahar Lookout and the glacier descending from the summit ice plateau, then west to the stack of altered lavas on the northwest edge of Sherman Crater, and back to Peter.
[Click image for movie; no audio] Here’s Peter again at one of the Moto fumaroles in 2006. Note that these vents are around the altered, mushy margins of a large lava block in the tephra. Note the yellow sulphur deposits. One of these was sampled in 2006 and again in 2007.
[Click image for movie] A vigorous fumarole in the ‘Smiley’ Group, July 29th 2007. This fumarole lies in talus near the floor of the crater west of the glacier’s edge. The vent is about 15 cm across. The fumarole, or one near it, was sampled in 1994, 1996, 2006 and again in 2007. The camera pans away from ‘Smiley’ to nearby fumaroles to the south- these are the ‘Moto Group’ and are just below the camera location for video 8533 at West Rim. Pooch Peak, on the SW margin of Sherman Crater, is the prominent tottering tower of hydrothermally altered andesite breccia.
Photo taken by John Scurlock from his airplane, shows the source area shortly after the slide occurred. This view looks west; Sherman Peak is on the left. Ice blocks the size of cars have piled up in the East Breach, the lowest point on Sherman Crater's rim. Large fumaroles are visible just inside the crater at this point. Hydrothermally altered rock is evident on all exposed rocks slopes in this area. For more aerial views of this ice and rock avalanche, please go to John Scurlock’s photo gallery.
Photo taken from the summit of Mount Baker by Kevin Hammonds, a USFS climbing ranger. It shows the 3-km debris flow deposit running nearly the full length of the Boulder Glacier.
Photo taken inside the East Breach during the gas sampling trip in late August. The location is at the fumarole field noted above. The climbers are Doug Nathe (left) and Alan Kearney (right). Photo by Dave Tucker.
Doug Nathe collecting gases from a fumarole on the floor of Sherman Crater, Aug. 22, 2006. Gas samples have been sent off to USGS, Menlo Park, for analysis. Analysis will eventually appear on this website. Photo by D. Tucker