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  • North Sister | U. S. Geological Survey - USGS. gov
    North Sister is the oldest and longest active volcano of the Three Sisters, and its period of construction from about 120 to 45 ka occurred after the eruptions of Broken Top ended
  • Newest Volcano Notice - USGS
    Activity Update: All volcanoes in the Cascade Range of Oregon and Washington are at normal background activity levels These include Mount Baker, Glacier Peak, Mount Rainier, Mount St Helens, and Mount Adams in Washington State and Mount Hood, Mount Jefferson, Three Sisters, Newberry, and Crater Lake in Oregon
  • Scientists detect new movement in Three Sisters volcanoes
    Scientists are seeing new signs that magma is moving deep within the Three Sisters volcanic complex in Oregon’s Cascade Range, but there are no signs of imminent eruption
  • Four volcanoes in Oregon rated very high threat - kgw. com
    Eleven of the 18 very high threat volcanoes are in Oregon, Washington and California Government scientists use various factors to compute an overall threat score for each of the 161 young
  • Three Sisters - Global Volcanism Program
    North Sister volcano on the right and Middle Sister to its left rise above ranch lands of eastern Oregon These large volcanoes have not been active since the Pleistocene, but scoria cones on the north flank of North Sister have produced some of the youngest lava flows in the Cascade Range
  • North Sister Volcano, Oregon (Canada and USA (mainland)) - Facts . . .
    North Sister is the glacially eroded remnant of a andesitic-dacitic stratovolcano, exposing the volcano's central plug Middle Sister volcano, also over 3000 m in elevation, is located only 2 km to the south
  • Three Sisters - Pacific Northwest Seismic Network
    Three Sisters are a cluster of volcanoes, composed of North Sister, Middle Sister, and South Sister They are located approximately 25 km SW of Sisters, OR North Sister is considered extinct, and Middle Sister has not erupted for 14,000 years
  • Three Sisters | U. S. Geological Survey - USGS. gov
    Three Sisters is a potentially active volcanic center that lies close to rapidly growing communities and resort areas in Central Oregon Volcanoes in the Three Sisters region have erupted a wide variety of magma types, therefore the shape, size, and impact of future lava flows could vary greatly


















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