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The Pacific Northwest Seismic Network

All about earthquakes and geologic hazards of the Pacific Northwest        



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Three Sisters

Latest Earthquakes near Three Sisters

NEW! Annual Time-Depth Plot of events near Three Sisters

Epicenter map and time vs. depth plots for earthquakes near Three Sisters in the last decade.

Webicorder Records.

Mount Adams | Mount Baker | Crater Lake | Glacier Peak | Mount Hood | Mount Rainier | Mount St. Helens | Three Sisters

Three Sisters Seismicity, 01/01/1999 thru 10/30/2009




Decadal Epicenters

Map Guide:

  • Red dots represent events occuring in the past month.
  • Green dots represent events occuring less than a year ago, but more than a month ago.
  • Circles represent older events.
  • Black triangles represent PNSN seismic stations. Stations are labeled with their names.
  • Black squares represent major cities.
  • Black stars indicate volcanoes.
  • Magnitude scale is at upper left; distance scale at lower left.



Time-Depth Plot


Graph showing relationship between time and depth of earthquakes in the Three Sisters/Newberry Caldera area. In this graph, sea level is equal to 0 km depth.

Time-Depth Plot




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