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Sisters77_south_sister_lava_flows_09-77.jpg
Aerial view of the south flank of South Sister composite volcano showing numerous blocky lava flows erupted about 2,000 years ago. Early eruptions formed Rock Mesa (just above center, far left), a broad flat flow emplaced on nearly level ground. Subsequent eruptions formed a line of lava domes and flows that extend from Sparks Lake meadow (lower right) to Green Lakes (just above center, far right). Several small lava domes were also formed on the northeast flank, out of view. Cratered cone in lower left is Talapus Butte, a basaltic scoria cone.
USGS Photograph taken in September 1977 by C.Dan Miller.
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Sisters85_aerial_three_sisters_oregon_09-85.jpg
Aerial view, the Three Sisters volcanoes in Oregon, from the south looking north. Left to right -- South Sister, Middle Sister, and North Sister.
USGS Photograph taken in September 1985 by Lyn Topinka.
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Sisters85_south_sister_from_SE_09-85.jpg
South Sister as seen from the southeast.
USGS Photograph taken in September 1985 by Lyn Topinka.
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Sisters85_USGS_scientist_EDM_lines_south_sister_09-85.jpg
USGS Scientist conducting Electronic Distance Measurement (EDM) lines, South Sister Volcano. EDM lines are conducted routinely to monitor these Cascades volcanoes for potential eruptive activity. By measuring the distance between two fixed points, these instruments can detect minor swelling of the volcanic edifice that often occurs prior to eruptions. The helicopter is measure air temperature along the line the EDM is reading.
USGS Photograph taken in September 1985 by Lyn Topinka.
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Sisters95_south_sister_and_sparks_lake_1995.jpg
South Sister volcano, reflected in the waters of Sparks Lake, is the highest and youngest of the Three Sisters volcanoes in the central Oregon Cascades. The summit cone of South Sister has not erupted since the very latest Pleistocene, but the light-colored rocks above the meadow at the left are part of a group of lava flows on the flank that were extruded about 2000 years ago.
USGS Photograph taken in 1995 by David Wieprecht.
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Sisters05_aerial_south_sister_from_west_01-14-05.jpg
Aerial view, the South Sister from the west.
USGS Photograph taken in January 14, 2005, by David Wieprecht.
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Sisters05_aerial_middle_north_sisters_from_east_01-14-05.jpg
Aerial view, Middle Sister and North Sister, from the east.
USGS Photograph taken in January 14, 2005, by David Wieprecht.
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Sisters05_south_sister_from_west_02-09-05.jpg
South Sister from the west.
USGS Photograph taken in February 9, 2005, by Gene Iwatsubo.
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Sisters05_middle_north_south_sisters_02-09-05.jpg
Middle (left), North (just visible), and South Sister.
USGS Photograph taken in February 9, 2005, by Gene Iwatsubo.
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Sisters05_north_middle_sisters_from_west_ssis_02-09-05.jpg
North Sister and Middle Sister, as seen from west of South Sister.
USGS Photograph taken in February 9, 2005, by Gene Iwatsubo.
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Sisters05_aerial_three_sisters_from_west_02-09-05.jpg
Aerial, Three Sisters from the west.
USGS Photograph taken in February 9, 2005, by Gene Iwatsubo.
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Sisters05_aerial_north_middle_sisters_from_west_02-09-05_bw.jpg
Aerial, North Sister and Middle Sister from the west. Converted to black/white from color original.
USGS Photograph taken in February 9, 2005, by Gene Iwatsubo.
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Sisters05_aerial_south_sister_from_west_02-09-05_bw.jpg
Aerial, South Sister from the west. Converted to black/white from color original.
USGS Photograph taken in February 9, 2005, by Gene Iwatsubo.
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Sisters05_aerial_three_sisters_bachelor_12-08-05.jpg
Aerial view, North, Middle, and, South Sister, Broken Top, and Mount Bachelor on the right, as seen from the southwest.
USGS Photograph taken on December 8, 2005, by Mike Doukas.
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Sisters05_aerial_south_sister_broken_top_from_SW_12-10-05.jpg
Aerial view, South Sister and Broken Top, Oregon, as seen from the southwest.
USGS Photograph taken on December 10, 2005, by Mike Doukas.
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Sisters06_south_sister_from_south_08-23-06.jpg
South Sister volcano as seen from the south.
USGS Photograph taken on August 23, 2006, by Carolyn Driedger.
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Sisters06_middle_sister_south_sister_08-25-06.jpg
Middle Sister (left) and South Sister (right).
USGS Photograph taken on August 25, 2006, by Carolyn Driedger.
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Sisters07_TheHusband_seismic_station_maintenance_05-10-07.jpg
U.S. Geological Survey scientists repair seismic station, The Husband, Three Sisters, Oregon.
USGS Photograph taken on May 10, 2007, by Mike Lisowski.
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Sisters07_TheHusband_gps_station_maintenance_05-10-07.jpg
U.S. Geological Survey scientists repair gps station, The Husband, Three Sisters, Oregon.
USGS Photograph taken on May 10, 2007, by Gene Iwatsubo.
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Sisters07_TheHusband_gps_station__05-10-07.jpg
USGS GPS Station, The Husband, Three Sisters, Oregon.
USGS Photograph taken on May 10, 2007, by Dave Sherrod.
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Sisters06_USGS_scientist_DanDzurisin_leveling_gun_08-24-06.jpg
U.S. Geological Survey scientist, Dan Dzurisin, using leveling gun at South Sister volcano, Oregon.
USGS Photograph taken on August 24, 2006, by Carolyn Driedger.
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MORE 2006 Leveling Images

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Annotated NASA Image: Looking South at the Three Sisters, Mount Jefferson, and Mount Hood, Oregon, August 1985.
-- NASA Photo, courtesy NASA Earth From Space; Modified with text by USGS/CVO.

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Annotated NASA Image: Three Sisters, Broken Top, Mount Bachelor, and Diamond Peak, October 1994..
-- NASA Photo, courtesy NASA Earth From Space; Modified with text by USGS/CVO.

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South Sister Volcano, from Sparks Lake area.
-- USGS Photo by Lyn Topinka, October 1984

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Aerial view, Three Sisters (left) and Broken Top (right foreground)
-- USGS Photo by W.E. Scott

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Aerial view south towards Upper Separation Creek Valley to Sphinx Butte
-- USGS Photo by Ken McGee, April 25, 2001

Bachelor01_bachelor_across_west_flank_ssis_04-25-01.jpg
Aerial view, Mount Bachelor as seen from looking across the west flank of South Sister.
USGS Photograph taken in April 25, 2001, by Ken McGee.
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